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Topics referred to by the same term
Transition frequency may refer to: A measure of the high-frequency operating characteristics of a transistor, usually symbolized as fT A characteristic
Transition_frequency
Measurement of atomic transition frequency
Saturated absorption spectroscopy measures the transition frequency of an atom or molecule between its ground state and an excited state, typically to
Saturated absorption spectroscopy
Saturated_absorption_spectroscopy
Early power transistor
lower currents). It often has a transition frequency of around 3.0 MHz and 6 MHz is typical for the 2N3055A; at this frequency the calculated current gain
2N3055
Type of structure in atomic physics
precise atomic clocks. The term transition frequency denotes the frequency of radiation corresponding to the transition between the two hyperfine levels
Hyperfine_structure
SI unit of time
numerical value of the caesium (Cs) frequency, ΔνCs, the unperturbed ground-state hyperfine transition frequency of the Cs-133 atom, to be 9192631770
Second
Clock that monitors the resonant frequency of atoms
monitoring the resonant frequency of atoms. It is based on the fact that atoms have quantised energy levels, and transitions between such levels are driven
Atomic_clock
Frequency in atomic physics
}{\hbar }}} is the Rabi Frequency. In the numerator we have the transition dipole moment for the i → j {\displaystyle i\to j} transition, whose squared amplitude
Rabi_frequency
shift caused by the laser intensity fluctuation has no effect on the transition frequency between the two clock states. The laser field in an optical lattice
Magic_wavelength
fixed numerical value of the caesium frequency, ΔνCs, the unperturbed ground-state hyperfine transition frequency of the caesium-133 atom, to be 9192631770
Isotopes_of_caesium
Frequency response boundary
Alternatively, a stopband corner frequency may be specified as a point where a transition band and a stopband meet: a frequency for which the attenuation is
Cutoff_frequency
Metric unit of mass
in terms of three defining constants of the SI, namely a specific transition frequency of the caesium-133 atom, the speed of light, and the Planck constant
Kilogram
Electromagnetic frequencies ranging from 9 kHz to 300 GHz
Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical
Radio_frequency
Frequency standard
clock is a frequency standard in which a specified hyperfine transition of electrons in rubidium-87 atoms is used to control the output frequency. The Rb
Rubidium_standard
SI unit of length
1/299792458 of a second, where the second is defined by a hyperfine transition frequency of caesium. The metre was originally defined in 1791 by the French
Metre
Model used in atom optics and magnetic resonance
while terms that oscillate with frequencies ωL−ω0 are kept, where ωL is the light frequency, and ω0 is a transition frequency. The name of the approximation
Rotating-wave_approximation
Measurement unit for time
fixed numerical value of the cesium frequency, ΔνCs, the unperturbed ground-state hyper-fine transition frequency of the cesium 133 atom, to be 9192631770
Unit_of_time
Form of particle interferometry
interferometry that uses the phenomenon of magnetic resonance to measure transition frequencies of particles. It was developed in 1949 by Norman Ramsey, who built
Ramsey_interferometry
Spectrum of phonetic resonance in speech production
The time course of these changes in vowel formant frequencies are referred to as 'formant transitions'. In normal voiced speech, the underlying vibration
Formant
Primary frequency standard
The caesium standard is a primary frequency standard in which the photon absorption by transitions between the two hyperfine ground states of caesium-133
Caesium_standard
Figure of merit for amplifiers
the cutoff and transition frequency can be estimated by dividing fT by the frequency. Usually, transistors must be used at frequencies well below fT to
Gain–bandwidth_product
Exotic particle made of an antiproton and positron
the 1s–2s transition splits into two hyperfine transitions with slightly different frequencies. The team calculated the transition frequencies for normal
Antihydrogen
NIST. May 2024. Retrieved 2024-05-18. "2022 CODATA Value: hyperfine transition frequency of Cs-133". The NIST Reference on Constants, Units, and Uncertainty
List_of_physical_constants
Type of atomic clock
stabilized by the atomic transition; the trapped atom or atoms are excited when the laser light is resonant with the transition frequency. State-of-art optical
Optical_clock
Universal and unchanging physical quantity
The other defining constants are less familiar, like the hyperfine transition frequency of cesium, written symbolically as ΔνCs Seven more familiar and historically
Physical_constant
Phenomenon in quantum physics
field and a pseudospin occurs when the field frequency ω is identical to the spin's transition frequency ω0. The RWA is, however, an approximation. In
Bloch–Siegert_shift
Dynamical Stark effect
(e.g., that of a laser) is tuned in resonance (or close) to the transition frequency of a given spectral line, and resulting in a change of the shape
Autler–Townes_effect
SI base unit of electric current
is defined in terms of ∆νCs [unperturbed ground state hyperfine transition frequency of caesium-133]. The SI unit of charge, the coulomb, "is the quantity
Ampere
Extremely accurate clock in development
uses photons from a nuclear isomeric transition as its reference frequency, instead of the atomic electron transition energy used by conventional atomic
Nuclear_clock
Electromagnetic spectrum 300–3000 MHz
Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the
Ultra_high_frequency
Type of electrical circuit
approximately one tenth of the transition frequency of the transistors. The transition frequency of a bipolar transistor, fT, is the frequency at which the short-circuit
Wilson_current_mirror
Type of transistor in electronic equipment
Ptotal = 500 mW (some manufacturers may specify 625 mW - see below) Transition frequency (gain-bandwidth product) fT = 150 MHz minimum (300 MHz typical) The
BC548
Types of cold cathode lamp
which can then be measured. To tune the light source to a specific transition frequency, a tuning parameter (often the driving current) of the light source
Hollow-cathode_lamp
Molecular ion
rotational and vibrational transitions can be investigated in extremely fine detail. The corresponding transition frequencies can be precisely measured
Dihydrogen_cation
Spectral line of hydrogen state transition in UHF radio frequencies
displayed as eight times 21 cm, or 168 cm. Similarly the frequency of the hydrogen spin-flip transition was used for a unit of time in a map to Earth included
Hydrogen_line
Electromagnetic wave range of 30–300 MHz
one meter. Frequencies immediately below VHF are denoted high frequency (HF), and the next higher frequencies are known as ultra high frequency (UHF). VHF
Very_high_frequency
Common NPN bipolar junction transistor
which is a "2N3904". It is a 200 mA, 40 V, 625 mW transistor with a transition frequency of 300 MHz, with a minimum beta, or current gain, of 100 at a collector
2N3904
1913 model of abrupt transitions of quantum systems
with radiation at two different frequencies to drive electron transitions. This requires one strong and one weak transition to be excited (denoted ω {\displaystyle
Quantum_jump
SI unit of temperature
based upon the principle that a black body radiator emits light with a frequency distribution characteristic of its temperature. Black bodies at temperatures
Kelvin
Modern form of the metric system
defining constants are the speed of light in vacuum c, the hyperfine transition frequency of caesium ΔνCs, the Planck constant h, the elementary charge e,
International_System_of_Units
Physical constants of energy and wavenumber
atomic transition frequencies of hydrogen alone. Instead, the Rydberg constant is inferred from measurements of atomic transition frequencies in three
Rydberg_constant
Electronic method of transmitting information with a carrier wave
Frequency modulation (FM) is a signal modulation technique used in electronic communication, originally for transmitting messages with a radio wave. In
Frequency_modulation
Signal boosting phenomenon using white noise
amplification effect is negligible unless the perturbation frequency ω is comparable with the transition frequency r± (dependent on the noise intensity), and it is
Stochastic_resonance
divided into two groups by the frequency at which they are observed: optical magnetic dipole transitions can occur at frequencies in the infrared, optical or
Magnetic_dipole_transition
Nonlinear optical process
occurs when two-level systems are driven at Rabi frequencies comparable to their transition frequencies, can give rise to second-harmonic generation in
Second-harmonic_generation
Means of studying the interaction of light and matter
Coulomb energy (bias voltage) and the Josephson energy (flux bias) the transition frequency ω a {\displaystyle \omega _{a}} is tuned. Due to the nonlinearity
Circuit quantum electrodynamics
Circuit_quantum_electrodynamics
Technique used to study & characterize materials
the frequency of the stress are often varied, leading to variations in the complex modulus; this approach can be used to locate the glass transition temperature
Dynamic_mechanical_analysis
Tables of radio frequencies assigned to television channels
television transition Knife-edge effect Multichannel television sound Pan-American television frequencies "Commercial Television Frequencies". Archived
Television channel frequencies
Television_channel_frequencies
Topics referred to by the same term
absorption, a set-up that enables the precise determination of the transition frequency of an atom between its ground state and an optically excited state
Saturation
Frequency at which a CPU chip or core is operating
In computing, clock rate or clock speed is the frequency at which the clock generator of a processor can generate pulses used to synchronize the operations
Clock_rate
Communication flowing simultaneously in both directions
a DECT phone or so-called TDD 4G or 5G phones requires only a single frequency for bidirectional communication, while a cell phone in the so-called FDD
Duplex_(telecommunications)
Quantum mechanical state change
wavefunction and its probability amplitude, ω0 is the atomic transition frequency, and ωk=c|k| is the frequency of the photon. The sum is over k and s, which are
Spontaneous_emission
Common PNP bipolar junction transistor
collector-emitter voltages of 40 V, for power dissipation of 300 mW. Its transition frequency Ft is 250 MHz, with a beta of at least 100. The 2N3904 (NPN) and
2N3906
Historical high-precision units of measurement
electrical units are based on defined values of the caesium-133 hyperfine transition frequency, Josephson constant and the von Klitzing constant, the first two
Conventional_electrical_unit
Plaques on the Pioneer 10 and 11 space probes with pictorial messages about humanity
hyperfine transition of hydrogen, which is the most abundant element in the universe. The spin-flip transition of a hydrogen atom's electron has a frequency of
Pioneer_plaque
Circuit that creates new frequencies from two signals
In electronics, a mixer or frequency mixer is a circuit that outputs signals with new frequencies from two signals input to it. In its most common application
Frequency_mixer
1938 experiment confirming relativistic time dilation
{\displaystyle \nu _{1}} and ν 2 {\displaystyle \nu _{2}} are the transition frequencies of the transitions in rest. β = v / c {\displaystyle \beta =v/c} with v {\displaystyle
Ives–Stilwell_experiment
Metastable excited state of a nuclide
Schumm, Thorsten; Ye, Jun (4 September 2024). "Frequency ratio of the 229mTh nuclear isomeric transition and the 87Sr atomic clock". Nature. 633 (8028):
Nuclear_isomer
Common NPN bipolar junction transistor
parameters include outline dimensions, small-signal current gain, transition frequency, maximum values for voltage withstand, current rating, power dissipation
2N2222
PNP bipolar transistor
transistor. Its transition frequency fT (where the current gain drops to one) under specified test conditions is 200 Megahertz. At low frequencies, the current
2N2907
Self-synchronizing line code
Differential Manchester encoding (DM) is a line code in digital frequency modulation in which data and clock signals are combined to form a single two-level
Differential Manchester encoding
Differential_Manchester_encoding
Laser cooling technique
its frequency is lower than the real transition frequency), and the second beam de-excites the atom to the other hyperfine level. The frequency difference
Raman_cooling
Quantum computing implementation
In coherent exchange, the transition frequency of one of the qubits is tuned such that it matches the transition frequency of the second qubit. This method
Superconducting quantum computing
Superconducting_quantum_computing
How sound behaves in an enclosed space
dominate. This transition frequency is popularly known as the Schroeder frequency (after Manfred R. Schroeder), or the cross-over frequency, and it differentiates
Room_acoustics
Techniques used for power management
Dynamic frequency scaling and dynamic voltage scaling are techniques used primarily for power management in computer architecture. Dynamic frequency scaling
Voltage_and_frequency_scaling
constant and the transition frequency, A u → l {\displaystyle A_{u\rightarrow l}} is the Einstein coefficient for the specific transition. The population
Spectral_line_ratios
Definition of the units kg, A, K and mol
structure transition frequency of the caesium-133 atom ΔνCs is exactly 9192631770 hertz (Hz); The luminous efficacy of monochromatic radiation of frequency 5
2019_revision_of_the_SI
Spectroscopic technique
techniques are complementary. They all give the same frequency for a given vibrational transition, but the relative intensities provide different information
Raman_spectroscopy
Energy–frequency relation in quantum mechanics
wave vector. Bohr's frequency condition states that the frequency of a photon absorbed or emitted during an electronic transition is related to the energy
Planck_relation
Form of error in digital signals; spurious signals near sharp transitions
rectangular filter) causes ripple in the frequency domain. JPEG compression can introduce ringing artifacts at sharp transitions, which are particularly visible
Ringing_artifacts
Atomic physics technique to achieve high phase space densities
total energy difference between these two states. The |mF=-1⟩→|mF=1⟩ transition frequency therefore experiences a Zeeman shift. With this in mind, the RF evaporative
Evaporative cooling (atomic physics)
Evaporative_cooling_(atomic_physics)
The transition band, also called the skirt, is a range of frequencies that allows a transition between a passband and a stopband of a signal processing
Transition_band
signal processing, a filter's frequency response comprises regions of frequency called passbands, stopbands, and transition regions. Typically there is
Filter_transition_region
Transition radiation (TR) is a form of electromagnetic radiation emitted when a charged particle passes through inhomogeneous media, such as a boundary
Transition_radiation
Treatment of welded steel constructions
High-frequency impact treatment (HiFIT) is the treatment of welded steel constructions at the weld transition to increase fatigue strength. The durability
High-frequency impact treatment
High-frequency_impact_treatment
Data communications modulation protocol
Frequency-shift keying (FSK) is a frequency modulation scheme in which digital information is encoded on a carrier signal by periodically shifting the
Frequency-shift_keying
Solid-state electrically operated switch also used as an amplifier
common-source circuit is denoted by the term fT, an abbreviation for transition frequency—the frequency at which the transistor yields unity voltage gain) Application:
Transistor
Alteration of the original shape of a signal
radio frequency applications is rarely expressed as THD. Non-flat frequency response is a form of distortion that occurs when different frequencies are
Distortion
Part of a spectrum
range Frequency allocation Frequency deviation Harmonics (electrical power) Passband Radio band Radio window Range (music) Spectral width Transition band
Spectral_band
Model in quantum optics
inversion operator, and ω a {\displaystyle \omega _{a}} is the atomic transition frequency. Moving from the Schrödinger picture into the interaction picture
Jaynes–Cummings_model
Apparatus for trapping and cooling neutral atoms
{\displaystyle \nu _{L}} is the frequency of the laser beams and ν 0 {\displaystyle \nu _{0}} is the frequency of the transition. The beams must be circularly
Magneto-optical_trap
Ultra high frequency radio to transmit TV
broadcasting is the use of ultra high frequency (UHF) radio for over-the-air transmission of television signals. UHF frequencies are used for both analog and digital
UHF_television_broadcasting
Physical effect in general relativity
Δν=ν2−ν1 is the gravitational redshift, ν1 is the optical clock transition frequency, ΔU=U2−U1 is the difference in gravitational potential, and α denotes
Gravitational_redshift
Baseband analog video signal format
systems. The frequency spectrum of the modulated color signal overlaps that of the baseband signal, and separation relies on the fact that frequency components
Composite_video
Synchronisation signal in colour video
information. In NTSC, the color burst frequency is exactly 315/88 = 3.57954 MHz with a phase of 180°. PAL uses a frequency of exactly 4.43361875 MHz, with its
Color_burst
Cooling technique in atomic physics
beams whose frequencies (and energy) are less than the atoms' laser-cooling transition. Standard cooling transitions are atomic transitions with certain
Laser_cooling
Full range of electromagnetic radiation frequencies
spectrum is the full range of electromagnetic radiation, organized by frequency or wavelength. The spectrum is divided into separate bands, with different
Electromagnetic_spectrum
Reversible transition in amorphous materials
The glass–liquid transition, or glass transition, is the gradual and reversible transition in amorphous materials (or in amorphous regions within semicrystalline
Glass_transition
Branch of molecular spectroscopy
ro-vibrational) transitions. When such transitions emit or absorb photons (electromagnetic radiation), the frequency is proportional to the difference in
Rotational–vibrational spectroscopy
Rotational–vibrational_spectroscopy
Chemical element with atomic number 55 (Cs)
fixed numerical value of the caesium frequency ΔνCs, the unperturbed ground-state hyperfine transition frequency of the caesium-133 atom, to be 9192631770
Caesium
Periodic motion of the atoms of a molecule
coordinates). In other words, they do not correspond to particular frequencies or vibrational transitions. Within the CH2 group, commonly found in organic compounds
Molecular_vibration
German physicist (born 1941)
source was to determine the frequency of the very narrow ultraviolet hydrogen 1S-2S two-photon transition. Since then, the frequency has been determined with
Theodor_W._Hänsch
{\displaystyle 001} , are examples of sum transitions. The frequency of a sum band is slightly less than the sum of the frequencies of the fundamentals, again due
Hot_band
Analog television system
limitations of frequency divider circuits when the color standard was promulgated, the color subcarrier frequency was constructed as a composite frequency assembled
NTSC
Frequency change of a wave for observer relative to its source
transition from high to low frequency is very abrupt. When the observer is far from the path of the object, the transition from high to low frequency
Doppler_effect
Family of digital modulation methods
property is that the modulations are low-frequency/low-bandwidth waveforms compared to the carrier frequency, which is known as the narrowband assumption
Quadrature amplitude modulation
Quadrature_amplitude_modulation
Change between conductive and non-conductive state
for this transition to occur is determined by the number of oscillators per unit volume of the material. Since every oscillator has a frequency (ω0) we
Metal–insulator_transition
Form of spectroscopy employed in physics, chemistry, biology, and other fields
the angular frequency ωp, which is scattered by a molecule has some small probability of inducing some vibrational (or rotational) transition, as opposed
Stimulated_Raman_spectroscopy
cancer rate, as measured variously by the number of new cancer cases (frequency), or death rate (mortality), per 100,000 population among countries, and
List of countries by cancer rate
List_of_countries_by_cancer_rate
Color encoding system for analogue television
colour subcarrier frequency. Exact colour subcarrier frequency of PAL-M is 3.575611 MHz, or 227.25 times System M's horizontal scan frequency. Almost all other
PAL
Measure in aviation
air traffic control and the local airport weather frequency or a METAR-issuing station. The transition altitude (TA) is the altitude above sea level at
Flight_level
travel, tourism, insurance
TRANSITION FREQUENCY
TRANSITION FREQUENCY
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TRANSITION FREQUENCY
TRANSITION FREQUENCY
TRANSITION FREQUENCY
TRANSITION FREQUENCY
TRANSITION FREQUENCY
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