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  2. Spectral line shape - Wikipedia

    en.wikipedia.org/wiki/Spectral_line_shape

    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 or weaker intensity in the spectrum. Ideal line shapes include Lorentzian , Gaussian and Voigt functions, whose parameters are the line position, maximum height and half-width. [ 1 ]

  3. Voigt profile - Wikipedia

    en.wikipedia.org/wiki/Voigt_profile

    The pseudo-Voigt profile (or pseudo-Voigt function) is an approximation of the Voigt profile V(x) using a linear combination of a Gaussian curve G(x) and a Lorentzian curve L(x) instead of their convolution. The pseudo-Voigt function is often used for calculations of experimental spectral line shapes.

  4. Spectral line - Wikipedia

    en.wikipedia.org/wiki/Spectral_line

    A spectral line is a ... There are a number of effects which control spectral line shape. A spectral line extends ... The energy shift as a function of distance ...

  5. Fano resonance - Wikipedia

    en.wikipedia.org/wiki/Fano_resonance

    Plot of scattering cross-section versus normalized energy for various values of the parameter q illustrating the asymmetric Fano line-shape. In physics, a Fano resonance is a type of resonant scattering phenomenon that gives rise to an asymmetric line-shape. Interference between a background and a resonant scattering process produces the ...

  6. Doppler broadening - Wikipedia

    en.wikipedia.org/wiki/Doppler_broadening

    This resulting line profile is known as a Doppler profile. A particular case is the thermal Doppler broadening due to the thermal motion of the particles. Then, the broadening depends only on the frequency of the spectral line, the mass of the emitting particles, and their temperature , and therefore can be used for inferring the temperature of ...

  7. Homogeneous broadening - Wikipedia

    en.wikipedia.org/wiki/Homogeneous_broadening

    The homogeneous broadened emission line will have a Lorentzian profile (i.e. will be best fitted by a Lorentzian function), while the inhomogeneously broadened emission will have a Gaussian profile. One or more phenomena may be present at the same time, but if one has a wider fluctuation, it will be the one responsible for the character of the ...

  8. Equivalent width - Wikipedia

    en.wikipedia.org/wiki/Equivalent_width

    The equivalent width is a convenient choice because the shapes of spectral features can vary depending upon the configuration of the system which is producing the lines. For instance, the line may experience Doppler broadening due to motions of the gas emitting the photons. The photons will be shifted away from the line center, thus rendering ...

  9. Stimulated emission - Wikipedia

    en.wikipedia.org/wiki/Stimulated_emission

    A line shape function can be normalized so that its value at ... g′(ν) is the spectral line shape function. Optical amplification