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A quantity undergoing exponential decay. Larger decay constants make the quantity vanish much more rapidly. This plot shows decay for decay constant (λ) of 25, 5, 1, 1/5, and 1/25 for x from 0 to 5. A quantity is subject to exponential decay if it decreases at a rate proportional to its current value.
Although the term skin effect is most often associated with applications involving transmission of electric currents, skin depth also describes the exponential decay of the electric and magnetic fields, as well as the density of induced currents, inside a bulk material when a plane wave impinges on it at normal incidence.
Figure 1: A comparison of Yukawa potentials where = and with various values for m. Figure 2: A "long-range" comparison of Yukawa and Coulomb potentials' strengths where =. If the particle has no mass (i.e., m = 0), then the Yukawa potential reduces to a Coulomb potential, and the range is said to be infinite.
Fluorescence-lifetime imaging microscopy or FLIM is an imaging technique based on the differences in the exponential decay rate of the photon emission of a fluorophore from a sample. It can be used as an imaging technique in confocal microscopy , two-photon excitation microscopy , and multiphoton tomography.
The constant decay rate of the golden rule follows. [8] As a constant, it underlies the exponential particle decay laws of radioactivity. (For excessively long times, however, the secular growth of the a k (t) terms invalidates lowest-order perturbation theory, which requires a k ≪ a i.)
This exponential decay is related to the motion of the particles, specifically to the diffusion coefficient. To fit the decay (i.e., the autocorrelation function), numerical methods are used, based on calculations of assumed distributions. If the sample is monodisperse (uniform) then the decay is
In semiconductor lasers, the carrier lifetime is the time it takes an electron before recombining via non-radiative processes in the laser cavity. In the frame of the rate equations model, carrier lifetime is used in the charge conservation equation as the time constant of the exponential decay of carriers.
It is a complex number with two pieces of information: real part is the temporal oscillation; imaginary part is the temporal, exponential decay. In certain cases the amplitude of the wave decays quickly, to follow the decay for a longer time one may plot log | ψ ( t ) | {\displaystyle \log \left|\psi (t)\right|}
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