Abstract

The broadening of second-derivative Gaussian and Lorentzian absorption lines has been calculated as a function of modulation amplitude. It is shown that Lorentzian line are more sensitive to modulation-induced distortion than Gaussian lines. For modulation levels <0.2 (half-width at half-height), broadening is less than 1% for Gaussian lines and 2% for Lorentzian lines.

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