Abstract

The strengths of more than 1600 lines of CH₄ have been measured in the spectral interval between 5500 and 6150 cm⁻¹ at room temperature and reduced temperatures. The variation of the measured strengths allows the energy of the lower state of the transition to be determined empirically using the temperature dependence of the methane partition function and the Boltzmann factor for the energy level populations. An error analysis, based on assumed errors in the strength and temperature measurements, is included. The average measured uncertainty in J is 0.2.

© 1990 Optical Society of America

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 from 3700 to 4136 cm⁻¹

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

Line positions and strengths of CO₂ in the 1200–1430-cm⁻¹ region

Robert A. Toth
Appl. Opt. 24(2) 261-274 (1985)

Tunable diode-laser absorption measurements of methane at elevated temperatures

V. Nagali, S. I. Chou, D. S. Baer, R. K. Hanson, and J. Segall
Appl. Opt. 35(21) 4026-4032 (1996)

Measurements of argon broadened Lorentz width and pressure-induced line shift coefficients in the ν₄ band of ¹²CH₄

Curtis P. Rinsland, V. Malathy Devi, Mary Ann H. Smith, and D. Chris Benner
Appl. Opt. 28(11) 2111-2118 (1989)