## Abstract

The considerable increase in high-resolution Fourier transform spectra has led to
a practical method of deriving individual line parameters from Fourier data.
This method concerns in the main those spectra exhibiting moderately dense
structure, so that spectral analysis can be carried out in pressure conditions
where collisional broadening dominates: (1) For any line under study, the
strength and width values can be determined simultaneously from the same
spectrum. (2) Instrumental distortions can be reduced by pressurizing the gas
sufficiently. In the present case the relevant corrections do not exceed
3%, in a few cases 5%. (3) Thus, from the analytical expression
of the apodized apparatus function, it is possible by means of a convolution
calculation to draw up a series of tabulations. These give the true linewidth
and the dimensionless quantity
*K*(*σ*_{0})*l*,
respectively, as functions of the width and maximum transmission of the observed
contour. The calculation has been extended to the case of doublets of the same
intensities, widths, and known spacing. The method has been tested by
investigating a few self-broadened lines in the
12°0—00°0 transition of N_{2}O and some
nitrogen-broadened lines in the fundamental band of NO recorded at the
laboratory by G. Guelachvili.

© 1982 Optical Society of America

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