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Distinctive narrow spectral feature of chemical species
A spectral line is a weaker or stronger region in an otherwise uniform and continuous spectrum. It may result from emission or absorption of light in
Spectral_line
Feature observed in spectroscopy
Spectral line shape or spectral line profile describes the form of an electromagnetic spectrum in the vicinity of a spectral line – a region of stronger
Spectral_line_shape
Color evoked by a single wavelength of light in the visible spectrum
A spectral color is a color that is evoked by monochromatic light, i.e. either a spectral line with a single wavelength or frequency of light in the visible
Spectral_color
Study involving matter and electromagnetic radiation
spectroscopy Scattering theory Slope spectroscopy Spectral line ratios Spectral power distribution Spectral theory Spectroscopic notation Telluric contamination
Spectroscopy
intensity in an experiment can be challenging, the ratio of different spectral line intensities can be used to achieve information about the plasma, as
Spectral_line_ratios
Spectral line of hydrogen state transition in UHF radio frequencies
The hydrogen line, 21 centimeter line, or H I line is a spectral line that is created by a change in the energy state of solitary, electrically neutral
Hydrogen_line
Linear prediction coefficients
Line spectral pairs (LSP) or line spectral frequencies (LSF) are used to represent linear prediction coefficients (LPC) for transmission over a channel
Line_spectral_pairs
Deep-red spectral line of hydrogen
deep-red visible spectral line of the hydrogen atom with a wavelength of 656.28 nm in air and 656.46 nm in vacuum. It is the first spectral line in the Balmer
Hydrogen-alpha
Radio telescope in Hawaii, US
instruments: broadband continuum receivers and heterodyne detection spectral line receivers. Continuum emission is a tracer of star formation in other
James_Clerk_Maxwell_Telescope
Quasar and Lyman-alpha blob in the constellations of Canes Venatici and Coma Berenices
in 2019 by Xue Ge et al. which utilizes the C IV emission line, an alternative spectral line to Hβ—using the same data reproduced by the earlier paper
TON_618
2016 military science fiction action film
Spectral is a 2016 military science fiction action film co-written and directed by Nic Mathieu. Written with Ian Fried and George Nolfi, the film stars
Spectral
Emission spectrum with Lorentzian profile
and semiconductors. Homogeneous broadening is a phenomenon whereby a spectral line is broadened by effects experienced equally by all atoms (or optical
Spectral_broadening
Release of a photon triggered by another
to the so-called line shape. Considering only homogeneous broadening affecting an atomic or molecular resonance, the spectral line shape function is
Stimulated_emission
Hydrogen spectral series
atomic physics, is one of a set of six named series describing the spectral line emissions of the hydrogen atom. The Balmer series is calculated using
Balmer_series
Branch of spectroscopy and of photography
Spectral imaging is imaging that uses multiple bands across the electromagnetic spectrum. While an ordinary camera captures light across three wavelength
Spectral_imaging
Spectral line of hydrogen in the Lyman series
Lyman-alpha, typically denoted by Ly-α or Lyα, is a spectral line of hydrogen (or, more generally, of any one-electron atom) in the Lyman series. A photon
Lyman-alpha
Chemical element with atomic number 36 (Kr)
and excimer lasers), each of which resonates and amplifies a single spectral line. Krypton fluoride also makes a useful laser medium. From 1960 to 1983
Krypton
Spectral line splitting in magnetic field
The Zeeman effect (Dutch: [ˈzeːmɑn]) is the splitting of a spectral line into several components in the presence of a static magnetic field. It is caused
Zeeman_effect
Optical device with parallel mirrors
{1}{(2\tau _{c})^{-1}+i2\pi (\nu -\nu _{q})}}.} Each mode has a normalized spectral line shape per unit frequency interval given by γ ~ q ( ν ) = 1 τ c | E ~
Fabry–Pérot_interferometer
Curve used to interpret spectral features in astronomy
describes the equivalent width of a spectral line as a function of the column density of the material from which the spectral line is observed. The curve of growth
Curve_of_growth
Chemical element with atomic number 2 (He)
the helium spectral line during the solar eclipse of 1868, while Lockyer observed it from Britain. However, only Lockyer proposed that the line was due to
Helium
Visible, gaseous part of a fire
typically being black-body radiation and spectral band emission, with both spectral line emission and spectral line absorption playing smaller roles. In the
Flame
Unit of length
which they called "Ångström", based on the wavelength of a specific spectral line. It was only in 1960, when the metre was redefined in the same way,
Angstrom
Topics referred to by the same term
of data transfer, bit rate or throughput Spectral linewidth, the width of an atomic or molecular spectral line Bandwidth may also refer to: Bandwidth (linear
Bandwidth
Formula for spectral line wavelengths in alkali metals
atomic physics, the Rydberg formula calculates the wavelengths of a spectral line in many chemical elements. The formula was primarily presented as a
Rydberg_formula
Spectral line splitting in electrical field
field. It is the electric-field analogue of the Zeeman effect, where a spectral line is split into several components due to the presence of the magnetic
Stark_effect
Part of a spectrum
spectral bands refer to the electromagnetic emission of polyatomic systems, including condensed materials, large molecules, etc. Each spectral line corresponds
Spectral_band
Frequencies of light emitted by atoms or chemical compounds
i.e. they are composed of more than one wavelength of light. This spectral line broadening has many different causes. Emission spectroscopy is often
Emission_spectrum
Atomic model introduced by Niels Bohr in 1913
spectra was the Rydberg–Ritz combination principle which related atomic spectral line frequencies to differences between 'terms', special frequencies characteristic
Bohr_model
Type of galactic nucleus
emission-line region (LINER) is a type of galactic nucleus that is defined by its spectral line emission. The spectra typically include line emission
Low-ionization nuclear emission-line region
Low-ionization_nuclear_emission-line_region
Concept in wave optics
Free spectral range (FSR) is the spacing in optical frequency or wavelength between two successive reflected or transmitted optical intensity maxima or
Free_spectral_range
Topics referred to by the same term
output of a pulse height analyzer for characteristic features such as spectral line, edges, and various physical processes producing continuum shapes Multispectral
Spectral_analysis
Phenomenon in physics
particles. Then, the broadening depends only on the frequency of the spectral line, the mass of the emitting particles, and their temperature, and therefore
Doppler_broadening
Chemical element with atomic number 81 (Tl)
method of flame spectroscopy, in which thallium produces a notable green spectral line. Thallium, from Greek θαλλός, thallós, meaning "green shoot" or "twig"
Thallium
Incoherent light source
current-densities produce narrow spectral-line emission, against a faint background of continuous radiation. Xenon has many spectral lines in the UV, blue, green
Flashtube
American physicist (1910–1997)
field was optical spectroscopy, and his research interests included spectral line shifts and collision-induced absorption and emission of atoms. He was
Shang-Yi_Ch'en
Analytical method using radiation to identify chemical elements in a sample
the quantity of an element in a sample. The wavelength of the atomic spectral line in the emission spectrum gives the identity of the element while the
Atomic_emission_spectroscopy
spectral lines, the decay is almost exponential; then, the profile of the spectral line is determined by the Fourier transform of the exponential decay of the
Optical_decay
Catalogue of spectral lines
six million spectral lines and is maintained by the National Radio Astronomy Observatory (NRAO). The name is a portmanteau of "spectral line catalogue"
Splatalogue
Form of electromagnetic radiation
nuclei. The long end of the EUV spectrum is set by a prominent He+ spectral line at 30.4 nm. EUV is strongly absorbed by most known materials, but synthesizing
Ultraviolet
Scientific facility at Haleakala Observatory in Hawaii, US
0.0464 nm (H-beta spectral line, turquoise) VBI red channel (69″ field of view) 656.282 nm, FWHM: 0.049 nm (H-alpha spectral line, light-red) 668.423 nm
Daniel K. Inouye Solar Telescope
Daniel_K._Inouye_Solar_Telescope
Substellar object
can fuse lithium (7Li). Astronomers classify self-luminous objects by spectral type, a distinction intimately tied to the surface temperature -- brown
Brown_dwarf
Dynamical Stark effect
frequency of a given spectral line, and resulting in a change of the shape of the absorption/emission spectra of that spectral line. The AC Stark effect
Autler–Townes_effect
Astrophysical maser, source of stimulated spectral line emission
astrophysical maser, which is a naturally occurring source of stimulated spectral line emission. Megamasers are distinguished from other astrophysical masers
Megamaser
Quantities describing probability of absorption or emission of light
between electron energy levels that substantially reproduced the atomic spectral line observations. In Bohr's model a photon with an energy equal to the difference
Einstein_coefficients
Special low-energy state in quantum mechanics
is only one spectral line of a singlet state. In contrast, a doublet state contains one unpaired electron and shows splitting of spectral lines into a
Singlet_state
Physics measurement techniques
proportional to the velocity along the line of sight. The net effect is a characteristic broadening of spectral lines, known as Doppler broadening, from
Plasma_diagnostics
Type of star with a prominent spectral line due to absorption from ionized mercury
peculiar star with a prominent spectral line at 398.4 nm, due to absorption from ionized mercury. These stars are of spectral type B8, B9, or A0, corresponding
Mercury–manganese_star
the analysis of astrophysical spectroscopy. He connected the observed spectral line frequencies with the orbits of electrons in his atoms. The connection
History_of_atomic_theory
of this spectral line by Chandra and XMM-Newton failed to find such a line, and thus, there is debate about whether the spectral line is evidence of dark
Indirect detection of dark matter
Indirect_detection_of_dark_matter
Quantum transitions that are not allowed in the most direct mechanism
spectroscopy, a forbidden mechanism (forbidden transition or forbidden line) is a spectral line associated with absorption or emission of photons by atomic nuclei
Forbidden_mechanism
Probability distribution of energy states of a system
state. This gives a stronger spectral line. However, there are other factors that influence the intensity of a spectral line, such as whether it is caused
Boltzmann_distribution
Range on the electromagnetic spectrum
that causes it. In many cases it is convenient to assume that a narrow spectral line is a Lorentzian or Gaussian, depending respectively on the decay mechanism
Absorption_band
Body of interstellar clouds
Visible light nebulae may be divided into emission nebulae, which emit spectral line radiation from excited or ionized gas (mostly ionized hydrogen); they
Nebula
strong carbon spectral line emission WN – (celestial object) nitrogen-rich Wolf–Rayet, a Wolf–Rayet star with strong nitrogen spectral line emission WNE
List_of_astronomy_acronyms
Principle of spectral lines
related version is that the wavenumber or reciprocal wavelength of each spectral line can be written as the difference of two terms. The simplest example
Rydberg–Ritz combination principle
Rydberg–Ritz_combination_principle
Topics referred to by the same term
malignancy ("blood cancer") Hotline, a telecommunications link Hydrogen line, a spectral line Hypotenuse Leg, a postulate of geometry HL, an amateur radio call
HL
Property in optics
well-defined spectral emission lines. Manufacturers of optical glass in general define principal index of refraction at yellow spectral line of helium (587
Refractive_index
Topics referred to by the same term
hypothesis, in statistical testing H-alpha (Hα), a deep-red visible spectral line of the hydrogen atom Ha (Chinese surname) (哈), found in the Hundred
Ha
Interstellar cloud composed of neutral atomic hydrogen
light (except in spectral lines from elements other than hydrogen) but are observed by the 21-cm (1,420 MHz) region spectral line. This line has a very low
H_I_region
Definition of the units kg, A, K and mol
the prototype of the metre to a certain number of wavelengths of a spectral line of a krypton-86 radiation, making it derivable from universal natural
2019_revision_of_the_SI
Collection of mathematical theories
In mathematics, spectral theory is an inclusive term for theories extending the eigenvector and eigenvalue theory of a single square matrix to a much broader
Spectral_theory
Edge of visible color
endpoints of the line, colors on the line are non-spectral (no monochromatic light source can generate them). Rather, every color on the line is a unique mixture
Line_of_purples
that explains spectral line radiation as electrons descend toward the nucleus, identifying hitherto unknown solar and nebular spectral lines. Niels Bohr
John_William_Nicholson
Layer of a star's atmosphere
characteristic red color due to electromagnetic emissions in the Hα spectral line. Information about the chromosphere is primarily obtained by analysis
Chromosphere
Band of the electromagnetic spectrum
strongest hydroxyl radical spectral line radiates at 18 centimeters, and atomic hydrogen at 21 centimeters (the hydrogen line). These two molecules, which
Water_hole_(radio)
Measure of the strength of a spectral line
of a spectral absorption line is the width of the rectangle which has the same area as that between the intensity profile of the absorption line as a
Equivalent_width
American astronomer (born 1936)
1970, Wilson led a team that made the first detection of a rotational spectral line of carbon monoxide (CO) in an astronomical object, the Orion Nebula
Robert_Woodrow_Wilson
Third letter of the Greek alphabet
elementary particle of light and other electromagnetic radiation The 434 nm spectral line in the Balmer series Surface energy in materials science The Lorentz
Gamma
Conjecture on zeros of the zeta function
system. This gives a heuristic picture of why the zeros might lie on a spectral line and why their spacings exhibit strong repulsion rather than random clustering
Riemann_hypothesis
Relatively young and nearby supernova remnant
claimed detection by the Compton Gamma Ray Observatory of a gamma ray spectral line of 44Ti which has a half-life of 60 years and therefore seemed to indicate
RX_J0852.0−4622
Extension of the Bohr model
spectral effects. For example, up to first-order perturbations, the Bohr model and quantum mechanics make the same predictions for the spectral line splitting
Bohr–Sommerfeld_model
Natural source of microwave radiation emission
An astrophysical maser is a naturally occurring source of stimulated spectral line emission, typically in the microwave portion of the electromagnetic
Astrophysical_maser
Temporary spots on the Sun's surface
examined the structure of starspot regions by analyzing variations in spectral line splitting due to the Zeeman effect; Doppler imaging showed differential
Sunspot
Measurement method using interference of waves
filters capable of selecting a single spectral line for imaging; for example, the H-alpha line or the Ca-K line of the Sun or stars. Fig. 10 shows an
Interferometry
Global network of identical telescopes
full-disk images of the Sun in the wavelength of the Hydrogen–α (Hα) spectral line every 20 seconds. These data products are used for research into the
Global Oscillations Network Group
Global_Oscillations_Network_Group
Types of cold cathode lamp
(HCL) is type of cold cathode lamp used in physics and chemistry as a spectral line source (e.g. for atomic absorption spectrometers) and as a frequency
Hollow-cathode_lamp
Geodetic survey from 1792 to 1798
wave length of a spectral line. According to him the standard length might be compared with that of a wave of light identified by a line in the solar spectrum
Arc measurement of Delambre and Méchain
Arc_measurement_of_Delambre_and_Méchain
Device for producing coherent EM waves in the sub-visible spectrum
inversion and emit radiation at about 22.0 GHz, creating the brightest spectral line in the radio universe. Some water masers also emit radiation from a
Maser
Type of ultraviolet laser important in chip manufacturing and eye surgery
Excimer laser development started with the observation of a nascent spectral line narrowing at 176 nm reported in 1971 by Nikolai Basov, V. A. Danilychev
Excimer_laser
Lenticular galaxy in the constellation Virgo
energetic central region. This nucleus is detectable due to its particular spectral line emission, allowing astronomers to measure the composition of the region
NGC_4762
Type of star
They display variability both in their light emission and in their spectral line profile. The variations in magnitude are generally smaller than 0.1
Slowly_pulsating_B-type_star
1977 radio signal detected as part of SETI
signals might do so using a frequency of 1420 megahertz (21-centimeter spectral line), which is naturally emitted by hydrogen, the most common element in
Wow!_signal
Technique to study materials that have unpaired electrons
unpaired electron with its environment influence the shape of an EPR spectral line. Line shapes can yield information about, for example, rates of chemical
Electron paramagnetic resonance
Electron_paramagnetic_resonance
Relative importance of certain frequencies in a composite signal
energy is finite, one may compute the energy spectral density. More commonly used is the power spectral density (PSD, or simply power spectrum), which
Spectral_density
Type of nuclear magnetic resonance spectroscopy
orientation due to molecular motions have pronounced effects on the spectral line shape. One example is the use of 2H-NMR to study lipid membrane phase
Deuterium_NMR
Topics referred to by the same term
underground line in Buenos Aires, Argentina D-line, Port Harcourt, a neighborhood in Port Harcourt, Nigeria D-line (IRC), a command in IRCd D-line, a spectral line
D_Line
Galaxy in the constellation Ursa Major
low-ionization nuclear emission-line region (LINER) at the core; a type of region that is characterized by spectral line emission from weakly ionized atoms
NGC_2841
Chemical element with atomic number 72 (Hf)
spectroscopy done by Henry Moseley in 1914 showed a direct dependency between spectral line and effective nuclear charge. This led to the nuclear charge, or atomic
Hafnium
Classification of stars based on spectral properties
of colors interspersed with spectral lines. Each line indicates a particular chemical element or molecule, with the line strength indicating the abundance
Stellar_classification
resonance energy distribution, impact and natural spectral line broadening and quadratic stark line broadening. The centralized inverse-Fano distribution
List of probability distributions
List_of_probability_distributions
Measure of a civilization's evolution
the possibility of detecting an artificial source by emphasizing the spectral line of hydrogen in its use for nuclear fusion. Dutil and Dumas consider
Kardashev_scale
Brightest star in the constellation Orion
located at a distance of approximately 850 light-years (260 pc). A star of spectral type B8Ia, Rigel is calculated to be anywhere from 61,500 to 363,000 times
Rigel
Observable events that result from the interaction of light and matter
reflection Twisted light Umov effect Zeeman effect, the splitting of a spectral line into multiple components in the presence of a magnetic field The ability
Optical_phenomenon
characteristic distortions in the spectral lines due to the Doppler effect. These distortions will move across spectral line profiles due to the stellar rotation
Doppler_imaging
Very rare astronomical objects that are thought to be quasar ionization echos
with unusual colors—strongly peaking in the r filter, suggesting a spectral line. In fact, the color is quite similar to the Green Pea galaxies (GPs)
Green_bean_galaxy
Galaxy in the constellation Ursa Major
low-ionization nuclear emission-line region (LINER) at its core, which is a type of region that is characterized by its spectral line emission from weakly ionized
NGC_2787
Probability distribution
pseudo-Voigt function is often used for calculations of experimental spectral line shapes. The mathematical definition of the normalized pseudo-Voigt profile
Voigt_profile
Distance over which a wave's shape repeats
optical wavelength references Index of wave articles Length measurement Spectral line Spectroscopy Spectrum Hecht, Eugene (1987). Optics (2nd ed.). Addison
Wavelength
Astronomical phenomenon
spectrum. The main method of observation is through spectroscopy, using spectral line analysis to measure the shape of the ionized region and the condition
Ionization_cone
SPECTRAL LINE
SPECTRAL LINE
Girl/Female
Hindu, Indian, Tamil
Special
Boy/Male
Hindu, Indian
Special
Girl/Female
Hindu, Indian, Tamil
Special
Boy/Male
Hindu
Special
Boy/Male
Hindu, Indian
Special
Girl/Female
Indian
Special
Girl/Female
Indian, Telugu
Special
Girl/Female
Hindu, Indian, Tamil
Special
Girl/Female
Greek, Indian, Marathi, Turkish
Special
Boy/Male
Indian
Special
Girl/Female
Indian
Special
Girl/Female
Bengali, Indian, Telugu
Special
Boy/Male
Hindu, Indian
Special
Girl/Female
Arabic, Bengali, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Muslim, Sindhi, Tamil, Telugu
Special
Girl/Female
Tamil
Special
Boy/Male
Tamil
Special
Boy/Male
Tamil
Saisnigda | ஸாஈஸà¯à®¨à¯€à®•à¯à®¤à®¾
Special
Saisnigda | ஸாஈஸà¯à®¨à¯€à®•à¯à®¤à®¾
Girl/Female
Bengali, Indian, Modern
Special
Girl/Female
Bengali, Indian, Telugu
Special
Boy/Male
Indian, Telugu
Special
SPECTRAL LINE
SPECTRAL LINE
Boy/Male
Hindu
Lotus, Abode of wealth
Girl/Female
Tamil
Bird, Hot
Girl/Female
American, British, Christian, English, German, Greek, Irish, Latin, Swedish
Follower of Christ; Christian
Girl/Female
Tamil
Partner, Chaste woman
Girl/Female
English
Modern; combination of Jocelyn and the musical term 'jazz. '.
Female
Egyptian
, Goddess of Truth.
Boy/Male
Arabic
Sword of the Kingdom
Boy/Male
Christian & English(British/American/Australian)
Honor
Boy/Male
Tamil
One who cannot be injured, Rice offered to deity in Hindu Pooja, Indestructible
Male
Japanese
(ä¹…å¿—) Japanese name HISASHI means "long-lived."
SPECTRAL LINE
SPECTRAL LINE
SPECTRAL LINE
SPECTRAL LINE
SPECTRAL LINE
a.
Of or pertaining to a specter; ghosty.
n.
The tarsius, or spectral lemur.
n.
One appointed for a special service or occasion.
n.
The several colored and other rays of which light is composed, separated by the refraction of a prism or other means, and observed or studied either as spread out on a screen, by direct vision, by photography, or otherwise. See Illust. of Light, and Spectroscope.
n.
A breastplate, esp. that worn by the Jewish high person.
n.
A medicine for diseases of the chest organs, especially the lungs.
a.
Of or pertaining to a scepter; like a scepter.
n.
A luminous appearance, or an image seen after the eye has been exposed to an intense light or a strongly illuminated object. When the object is colored, the image appears of the complementary color, as a green image seen after viewing a red wafer lying on white paper. Called also ocular spectrum.
a.
Of or pertaining to a sector; as, a sectoral circle.
a.
Limited in range; confined to a definite field of action, investigation, or discussion; as, a special dictionary of commercial terms; a special branch of study.
pl.
of Spectrum
a.
Having the breast conspicuously colored; as, the pectoral sandpiper.
a.
Appropriate; designed for a particular purpose, occasion, or person; as, a special act of Parliament or of Congress; a special sermon.
a.
Relating to, or good for, diseases of the chest or lungs; as, a pectoral remedy.
n.
An apparition; a specter.
n.
A clasp or a cross worn on the breast.
a.
Of or pertaining to the spectrum; made by the spectrum; as, spectral colors; spectral analysis.
a.
Of or pertaining to the breast, or chest; as, the pectoral muscles.
adv.
In the form or manner of a specter.