Abstract

Computer-aided measurement of absorption line strengths from high resolution spectra greatly improves the accuracies to which relative line strengths can be determined. This article describes a computer program written for interactive use on a Prime minicomputer to fit simultaneously absorption line positions, strengths, linewidths, and continuum parameters. Application to the methane spectrum indicates that relative line strengths have been measured with accuracies of 2% or better for single isolated absorptions. Line strengths from the Q branches of the <i>v</i>₄ and <i>v</i>₁ + <i>v</i>₄ bands of methane are reported and compared to calculated values given in the 1980 Air Force Geophysical Laboratory (AFGL) Compilation of Molecular Parameters.

Measured line positions and strengths of methane between 5500 and 6180 cm⁻¹

Jack S. Margolis
Appl. Opt. 27(19) 4038-4051 (1988)

Methane line parameters for the 2.3-μm region

Linda R. Brown and Laurence S. Rothman
Appl. Opt. 21(13) 2425-2427 (1982)

Line parameters of methane from 2385 to 3200 cm⁻¹

Robert A. Toth, Linda R. Brown, Robert H. Hunt, and Laurence S. Rothman
Appl. Opt. 20(6) 932-935 (1981)

Methane line parameters from 3700 to 4136 cm⁻¹

Linda R. Brown
Appl. Opt. 27(15) 3275-3279 (1988)

Measurements of DF laser absorption by methane using an intracavity spectrophone

D. H. Leslie and G. L. Trusty
Appl. Opt. 20(11) 1941-1947 (1981)