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Concept in statistics and wave theory
In a distribution, full width at half maximum (FWHM) is the difference between the two values of the independent variable at which the dependent variable
Full_width_at_half_maximum
Width of an electromagnetic beam
the beam's width. An obvious choice for this fraction is 1/2 (−3 dB), in which case the diameter obtained is the full width at half maximum (FWHM). Beamwidth
Beam_diameter
Probability distribution
) {\textstyle \operatorname {Gamma} (\alpha ,\beta )} ). The full width at half maximum of a unimodal probability distribution is the difference between
Gamma_distribution
Atmospheric distortions of light
the Fried parameter r0. The diameter of the seeing disk is the full width at half maximum of its optical intensity. An exposure time of several tens of
Astronomical_seeing
Topics referred to by the same term
Half width may refer to: Full width at half maximum Halfwidth and fullwidth forms Half-width kana This disambiguation page lists articles associated with
Half-width
Measurement in communication theory
applications, the usual method of specifying spectral width is the full width at half maximum (FWHM). This is the same convention used in bandwidth,
Spectral_width
Probability distribution
} The full width at half maximum (FWHM) of the Voigt profile can be found from the widths of the associated Gaussian and Lorentzian widths. The FWHM
Voigt_profile
Microscopic optical resolution test device
standard) in the system's image of the slide. The approximate full width at half maximum of the imaging point spread function, and distance two point objects
1951 USAF resolution test chart
1951_USAF_resolution_test_chart
Optoelectronics component
light-emitting diodes. Its emission optical bandwidth, also described as full-width at half maximum, can range from 5 up to 750 nm. The superluminescent diode was
Superluminescent_diode
Radiation resulting from particle-antiparticle collisions
photon spectrum by annihilation radiation therefore has a higher full width at half maximum (FWHM) than decay-generated gamma rays in spectrum. The difference
Annihilation_radiation
Atmospheric window
atmospheric transmission window centred on 1.65 micrometres with a Full width at half maximum of 0.35 micrometres (in the near-infrared). Save for a limited
H_band_(infrared)
Resonator damping parameter
resonance width or full width at half maximum (FWHM) i.e. the bandwidth over which the power of vibration is greater than half the power at the resonant
Q_factor
Feature observed in spectroscopy
position of the maximum (corresponding to the transition energy E), p is a position, and w is the full width at half maximum (FWHM), the width of the curve
Spectral_line_shape
radiation pattern is defined here as the full width at half maximum and the radiation angle at half maximum radiant intensity. Effective mode volume is
Effective_mode_volume
Technique for astrophotography
smeared-out or blurred the astronomical images. In that work, the full width at half maximum (FWHM) of the blurring was estimated, and used to select exposures
Lucky_imaging
Measure of resolving power
height, for example 0.5%, 5%, 10% or 50%. The latter is called the full width at half maximum (FWHM). The valley definition defines ΔM as the closest spacing
Resolution (mass spectrometry)
Resolution_(mass_spectrometry)
is and the sharper the image. It is a similar measurement to full width at half maximum (FWHM), but is a more robust measurement especially for stars
Half_flux_diameter
If the object or region to be imaged is less than twice the full width at half maximum (FWHM) resolution in x-, y- and z-dimension of the imaging system
Partial_volume_(imaging)
Spectroscopic technique
energy. Aluminum Kα X-rays have an intrinsic full width at half maximum (FWHM) of 0.43 eV, centered at 1486.7 eV (E/ΔE = 3457).[citation needed] For
X-ray photoelectron spectroscopy
X-ray_photoelectron_spectroscopy
Tobler is probably among the first to use the word. Kell factor Full width at half maximum "Dr". geog.tamu.edu. Archived from the original on 2002-11-06
Resel
Mathematical function
concave quadratic function. The parameter c is related to the full width at half maximum (FWHM) of the peak according to FWHM = 2 2 ln 2 c ≈ 2.35482
Gaussian_function
Interstellar comet in 2025
the most visible part of the coma (the coma's full width at half maximum) and 10 arcseconds for the full extent of the coma. As 3I/ATLAS approaches the
3I/ATLAS
Topics referred to by the same term
Half power frequency Half power beam width Square root, written in exponent notation as x1/2 All pages with titles containing half power Full width at
Half_power
Lithography using 13.5 nm UV light
lines clustered around 13.5 nm with a 2% full-width at half-maximum (FWHM) bandwidth. The source operates at a repetition rate of ~50 kHz and conversion
EUV_lithography
Trace radiation from the early universe
measure of the width of the PVF. The WMAP team finds that the PVF is greater than half of its maximal value (the "full width at half maximum", or FWHM) over
Cosmic_microwave_background
Probability distribution
on the occurrence of the normal distribution in number theory Full width at half maximum Gaussian blur – convolution, which uses the normal distribution
Normal_distribution
Foundational principle in quantum physics
Another common measure is the product of the time and frequency full width at half maximum (of the power/energy), which for the Gaussian equals 2 ln 2
Uncertainty_principle
Frequency response boundary
exponentially along the waveguide axis and the wave is thus evanescent. Full width at half maximum High-pass filter Miller effect Spatial cutoff frequency (in optical
Cutoff_frequency
Group of satellites to detect nuclear detonations
years. In front of each crystal was a slat collimator providing a full width at half maximum (FWHM) aperture of c. 6.1 × 6.1 degrees. The effective detector
Vela_(satellite)
Relativistic particle resonance and decay line broadening
colliding particles, Γ {\displaystyle \Gamma } is the resonance's full width at half maximum, and B in {\displaystyle B_{\text{in}}} is the branching fraction
Relativistic Breit–Wigner distribution
Relativistic_Breit–Wigner_distribution
Range of usable frequencies
its maximum. This same half-power gain convention is also used in spectral width, and more generally for the extent of functions as full width at half maximum
Bandwidth_(signal_processing)
Probability distribution
which specifies the half-width at half-maximum (HWHM), alternatively 2 γ {\displaystyle 2\gamma } is full width at half maximum (FWHM). γ {\displaystyle
Cauchy_distribution
Measurement of atomic transition frequency
the pulsation will therefore be proportional to a Gaussian with full width at half maximum Δ ω lab = ω 0 8 k B T ln 2 m c 2 . {\displaystyle \Delta \omega
Saturated absorption spectroscopy
Saturated_absorption_spectroscopy
Light fixture that emits long-wave ultraviolet light and very little visible light
nearest 10 nm. "Width" is the measure between points on the shoulders of the peak that represent 50% intensity: the full width at half maximum (FWHM). Another
Blacklight
Diffraction pattern in optics
{\displaystyle {d}} is the diameter of the aperture in meters. The full width at half maximum is given by θ F W H M = 1.029 λ d . {\displaystyle \theta _{\mathrm
Airy_disk
Examining a substance by measuring electrons emitted in the photoelectric effect
energy resolution of the electron analyzer, peaks appear with full width at half maximum (FWHM) less than 5–8 meV. Angle resolved photoemission spectroscopy
Photoemission_spectroscopy
Ultraviolet source based on spontaneous emission of excimer molecules
of an excimer lamp is concentrated in this emission band. The full width at half maximum of the emission band depends on a kind of an excimer molecule
Excimer_lamp
Analytical technique based on determining mass to charge ratio of ions
different at different m/z. It is usually operationalized as the full width at half maximum a peak at that given m/z. The resolution is the ratio m / z Δ ( m /
Mass_spectrometry
Phenomenon in physics
{\displaystyle \sigma _{f}={\sqrt {\frac {kT}{mc^{2}}}}\,f_{0}} and full width at half maximum (FWHM) Δ f FWHM = 8 k T ln 2 m c 2 f 0 . {\displaystyle \Delta
Doppler_broadening
Physical parameter commonly used in astrophysics
{\displaystyle [v,v+\mathrm {d} v]} . The line width is also often specified in terms of the FWHM (full width at half maximum), which is F W H M = 2 2 ln 2 σ =
Doppler_parameter
Measure of the deviation of position over time
particle at x ( t ) {\displaystyle x(t)} is Gaussian, and the width of the Gaussian is time dependent. More specifically the full width at half maximum
Mean_squared_displacement
Release of a photon triggered by another
{\displaystyle \Gamma } is the full width at half maximum or FWHM bandwidth. The peak value of the Lorentzian line shape occurs at the line center, ν = ν 0
Stimulated_emission
Eruption of electromagnetic radiation
a normal sunflare. A common measure of flare duration is the full width at half maximum (FWHM) time of flux in the soft X-ray bands 0.05 to 0.4 and 0
Solar_flare
Monochrome light beam whose amplitude envelope is a Gaussian function
the beam w(z), at any position z along the beam, is related to the full width at half maximum (FWHM) of the intensity distribution at that position according
Gaussian_beam
Filter in electronics and signal processing
equals approximately 1.1774 {\displaystyle 1.1774} , which is half the Full Width at Half Maximum (FWHM) (see Gaussian function). For c = 2 {\displaystyle
Gaussian_filter
NASA X-ray astronomy satellite (1970–1973, decay 1979)
to back and were collimated to 0.52° × 0.52° and 5.2° × 5.2° (full width at half maximum) respectively. While the 0.52° detector gave finer angular resolution
Uhuru_(satellite)
Quantitative study of the energy spectra of gamma-ray sources
to express detector resolution is full width at half maximum (FWHM). This is the width of the gamma ray peak at half of the highest point on the peak distribution
Gamma_spectroscopy
Camera to record gamma radiation
source from the collimator. Pulse-height analyser determines the Full width at half maximum that selects certain photons to contribute to the final image
Gamma_camera
Optical device with parallel mirrors
_{q})^{2}}},} whose frequency integral is unity. Introducing the full width at half maximum (FWHM) linewidth Δ ν c {\displaystyle \Delta \nu _{c}} of the
Fabry–Pérot_interferometer
Series of techniques in optical microscopy
fluorophores). By scanning this focal spot, one retrieves the image. The full width at half maximum (FWHM) of the point spread function (PSF) of the excitation focal
Super-resolution_microscopy
Concept in physics
principle. Without the influence of the lattice, the natural line width (full width at half maximum) of the chromophore is γ0 = 1/T10 . The lattice reduces the
Zero-phonon line and phonon sideband
Zero-phonon_line_and_phonon_sideband
Type of display device
and saturated emission colors with narrow bandwidth, with FWHM (full width at half maximum) in the range of 20–40 nm. Their emission wavelength is easily
Quantum_dot_display
Filters for an optical system
system (1953). At present, there are more than 200 photometric systems. Photometric systems are usually characterized according to the widths of their passbands:
Photometric_system
Optical device for selecting part of a spectrum
is defined as the width of the triangle at the points where the light has reached half the maximum value (full width at half maximum, abbreviated as FWHM)
Monochromator
Analytical technique used to separate and identify ionized molecules in the gas phase
{LEQ}{16kT\ln 2}}}} where tD is the ion drift time, ΔtD is the full width at half maximum, L is the tube length, E is the electric field strength, Q is
Ion_mobility_spectrometry
Galaxy in the constellation Crater
feature. A weak hydrogen alpha component has been detected with a full width at half maximum (FWHM) of 1,950 kilometers per seconds. A study also found the
NGC_3660
\mu } th mode, δ λ g {\displaystyle \delta \lambda _{g}} is the full width at half maximum (FWHM) of the gain curve, the centre of which is given by λ (
Laser_diode_rate_equations
Metal alloy
2.5% FWHM energy resolution at 662 keV. Pixelated CZT with a volume of 6 cm3 can achieve 0.71% FWHM energy resolution at 662 keV and perform Compton imaging
Cadmium_zinc_telluride
Compound of carbon, oxygen, and hydrogen
numerical aperture (NA) and the focusing resolution. The full-width at half-maximum (FWHM) of 320 nm at the minimum focal spot using a 650 nm input beam has
Graphite_oxide
Soviet space station (1974–1977)
limited by a slit collimator to 3 in × 10 in (76 mm × 254 mm) full width at half maximum. The instrumentation also included optical sensors which were
Salyut_4
Technique used to classify metamorphic activity in pelitic rocks
The Kübler index is experimentally determined by measuring the full width at half maximum for the X-ray diffraction reflection peak along the (001) crystallographic
Illite_crystallinity
Material which glows when excited by ionizing radiation
upon the detector; the energy resolution is the ratio of the full width at half maximum of a given energy peak to the peak position, usually expressed
Scintillator
band at a certain wavelength interval. Full width at half maximum (F): The width of an imaginary horizontal line positioned at half of the maximum absorption
Spectroradiometry for Earth and planetary remote sensing
Spectroradiometry_for_Earth_and_planetary_remote_sensing
American space program to study Jupiter (1989–2003)
operating at a frequency-doubled wavelength of 532 nm, with a repetition rate of 15 to 30 Hertz and a pulse power full width at half maximum (FWHM) in
Galileo_project
Seyfert 1 galaxy in the constellation Pisces
line profile composed of one intermediate-width and one very broad component with full width at half maximum velocities of 1,964 ± 18 and 7,570 ± 83 kilometer
PG_0026+129
Measurement of variations in Earth's gravitational field
person at a distance of 2 metres would provide a gravity gradient signal approximately one E. Mountains can give signals of several hundred eotvos. Full tensor
Gravity_gradiometry
Quasar in the constellation of Boötes
peculiar characteristics such as narrowest Balmer lines with a full width at half-maximum (FWHM) of 1630 km s−1. Researchers also found a peculiar feature
PG_1543+489
Brightest cluster galaxy in the constellation Leo
the BCG displaying quiescent gas, with the lines displaying a full width at half maximum (FWHM) of 482 ± 82 kilometers per second. The BCG is a radio galaxy
ZwCl_3179_BCG
Seyfert 2 galaxy in the constellation Perseus
and strong emission lines that are slightly blue in color, with full width at half maximum velocities of 250 kilometers per seconds. There is also a line-emitting
Markarian_1073
Statistical technique for meta-analyzing studies in brain activity
closer to the peak coordinate have higher values. A rather large full-width at half-maximum (FWHM) of 20mm is used to account for different sources of spatial
Seed-based_d_mapping
Technique for the characterisation of crystalline materials
_{k}\right)^{2}\right]} where H k {\displaystyle H_{k}} is the full width at half peak height (full-width half-maximum), 2 θ k {\displaystyle 2\theta _{k}} is the center
Rietveld_refinement
Japanese heavy metal band
Akagi. Maximum the Hormone released their next album, Bu-ikikaesu, in 2007 The album debuted at number five on the Oricon chart; their first full album
Maximum_the_Hormone
Radio galaxy in the constellation of Serpens
western component being the slightly brightest and has a high full width at half maximum. A population of both red and blue galaxies have been found in
3C_324
X-ray crystallographic technique
the observed phenomena is dictated by the time width of the probing pulse (full width at half maximum). All processes that happen on a faster time scale
Time-resolved_crystallography
Physical effect in general relativity
thousand quasars and one hundred Seyfert Type I galaxies from the full width at half maximum (FWHM) of their emission lines, finding log z ≈ −4, compatible
Gravitational_redshift
Radio galaxy in the constellation Andromeda
galaxy based on a line profile fitting analysis. The lines show a full width at half maximum (FWHM) of 1,078 kilometers per seconds. "NED Search results for
TXS_0035+227
Radio galaxy in the constellation Pisces
central radio core is found to be resolved with an approximate full width at half maximum axis of 0.7 × 0.8 milliarcseconds, with the core's total flux
MS_0011.7+0837
Radio galaxy in the constellation Virgo
opposite side of the nucleus, with a wide velocity width of 1900 km/s at full width at half maximum. Further evidence also showed the nebula is extended
4C_03.24
Quasar in the constellation Boötes
south-east and a redshifted component located north-west with full-width at half maximum measurements of 357.2 ± 2.0 km s−1 and 497.7 ± 6.5 km s−1 respectively
7C_1354+2552
Quasar in the constellation of Cancer
profile was discovered in the host galaxy of HS 0810+2554 with a full width at half maximum of 380 ± 10 kilometer per seconds with its emission peak shifted
HS_0810+2554
Spectral linewidth of a laser beam
no quantized fields or quantum fluctuations), resulting in the half-width-at-half-maximum (HWHM) maser linewidth Δ ν M ∗ = 4 π k B T ( Δ ν c ∗ ) 2 P o u
Laser_linewidth
Width of the beam of light emitted by a light
definition, which is commonly used, the beam angle is the angular full width at half maximum (FWHM). Notably, the term intensity is used here as a shorthand
Beam_angle
Quasar in the constellation Camelopardalis
spectrum being influenced by its tapered broad line region with a full width at half maximum measurement of 1780 km s−1. Besides iron, IRAS 07598+6508 emits
IRAS_07598+6508
NASA satellite of the Explorer program
at higher time resolution with reduced energy resolution. The energy resolution was 32%. The angular resolution was 2.5° Full width at half maximum (FWHM)
Dynamics_Explorer_1
Radio galaxy in the constellation of Cetus
On the eastern side of the nucleus, the line widths are different, with a full-width at half maximum of 300 kilometers per seconds which is more compared
TXS_0211−122
Sub-class of survival models
particle at x ( t ) {\displaystyle x(t)} is Gaussian, and the width of the Gaussian is time dependent. More specifically the Full Width at Half Maximum (FWHM)
First-hitting-time_model
Quasar in the constellation Canis Minor
a half light radius measurement of re = 13 kiloparsecs. The black hole mass in PKS 0736+017 is 7.32+0.89-0.91 × 107 M☉ based on a full width at half maximum
PKS_0736+017
Imaging systems using changes in phase
few microradians to tens of microradians and is related to the full width at half maximum (FWHM) of the rocking curve of the crystal. When the analyzer
Phase-contrast_X-ray_imaging
potentially increase the NA and the focusing resolution. The full-width at half-maximum (FWHM) of 320 nm at the minimum focal spot using a 650 nm input beam has
Flat_lens
Star-forming region in the constellation Cassiopeia
JCMT data. Other subregions includes W3 East and W3 West with full widths at half maximum under 0.45 parsecs, showing high densities and protostellar activity
Westerhout_3
Type 2 quasar in the constellation Sextans
major axis being -61°. There are broad wing features that have full width at half maximum of 1000 to 1200 kilometers per seconds and are blueshifted by
J1010+0612
Seyfert type 2 galaxy in the constellation Draco
component. The broad and narrow components are estimated to have full-width at half maximum measurements of 386 ± 14 and 1,543 ± 34 kilometer per seconds
IRAS_F17179+5444
Using helium atoms to image solid surfaces
_{A}^{2}(1-\theta (F))}}.} In this equation Φ {\displaystyle \Phi } is the Full Width at Half Maximum of the beam, δ {\displaystyle \delta } is the geometrical projection
Scanning_helium_microscopy
Seyfert 2 galaxy in the constellation Leo
doubly ionized oxygen emission. An outflow is detected with a full width at half maximum of 813 ± 25 kilometers per second and is also being blueshifted
SDSS_J1108+0659
Branch of astronomy that uses X-ray observation
mirrors beyond 10 keV. HEFT has an energy resolution of 1.0 keV full width at half maximum at 60 keV. HEFT was launched for a 25-hour balloon flight in May
X-ray_astronomy
Emission-line galaxy in the constellation Coma Berenices
systems are located at redshift of 0.1491 while the red systems have a redshift of 0.1510. Both have a full width at half maximum (FHWM) of 140 km s−1
SDSS_J131642.90+175332.5
BL Lacertae object in the constellation Pisces
possibility of a blazar source. The lines are significantly broad, with full width at half maximum speeds of up to 1,400 kilometers per second, suggesting the line
J2341+0018
harmonic spectrum fits very well with the Gaussian profile with a full width at half maximum of 4.7 meV as well as presents a 200 μW power.[citation needed]
Laser-based angle-resolved photoemission spectroscopy
Laser-based_angle-resolved_photoemission_spectroscopy
Galaxy in the constellation Pavo
components like a broad-line component measuring ~ 2000–2500 km s−1 at full width at half maximum (FWHM) connected with the other nucleus, within the galaxy's
IRAS_19254−7245
mission FWHM – (instrumentation) full width at half maximum, a telescope resolution FWZI – (instrumentation) full width at zero intensity, a telescopes resolution
List_of_astronomy_acronyms
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