Abstract
The Fabry—Perot interferometer (FPI) is one of a few spectroscopic instrumemts for which analytic approximation to its instrumental function is known with a high accuracy. If the real shape of a spectral line is known, the shape observed by means of the ΓΡI can be expressed as a convolution of the real shape and the instrumental function. The expression for such a convolution is called the response of the FΡI. The responses of the scanning FΡI to the Voigt profile (VP) [1], asymmetric Voigt profile (AVP) [2] and speed-dependent Voigt profile (SDVP) [3] have been reported in previous papers. In this paper we present a formula for the response of FΡI to the speed-dependent asymmetric Voigt profile. We also analyse the dependence of the collision-time asymmetry on the emitter velocity and discuss the influence of the correlation effects and collision-time asymmetry on the deviations of the real profile from the Voigt profile observed using the Fabry-Perot interferometer. In the near-wing region the line shape of the pressure broadened spectral line can be approximately described by a superposition of the Lorentzian and dispersion profiles [4,51:
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