Diode laser spectroscopy of methane overtone transitions
- 20 September 1993
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 32 (27) , 5211-5216
- https://doi.org/10.1364/ao.32.005211
Abstract
With the aid of commercial room-temperature AlGaAs diode lasers, frequency modulation absorption spectroscopy was performed on the 7900 Å and 8600 Å rovibrational combination overtone bands of methane. Three weak transitions are reported in the range around 8610 Å that, to our knowledge, have not yet been observed and measured. Self-broadening and pressure-broadening coefficients of one of these new absorption features (at 8608.93 Å) were derived from CH4 and for CH4 immersed in N2 and He buffer gases. An evaluation of the methane detection sensitivity is given for favorable laboratory conditions as well as for an open-path situation.Keywords
This publication has 17 references indexed in Scilit:
- Diode laser spectroscopy: Water vapour detection in the atmosphereIl Nuovo Cimento D, 1991
- Measurements of air-, N_2-, and O_2-broadened halfwidths and pressure-induced line shifts in the ν_3 band of ^13CH_4Applied Optics, 1991
- Tunable diode laser IR spectrometer for in situ measurements of the gas phase composition and particle size distribution of Titan’s atmosphereApplied Optics, 1990
- Spectroscopy of water vapor in the 720-nm wavelength region: Line strengths, self-induced pressure broadenings and shifts, and temperature dependence of linewidths and shiftsJournal of Molecular Spectroscopy, 1989
- Measurements of air-broadened and nitrogen-broadened Lorentz width coefficients and pressure shift coefficients in the ν_4 and ν_2 bands of 12CH_4Applied Optics, 1988
- The high-resolution spectrum of water vapor between 13 200 and 16 500 cm−1Journal of Molecular Spectroscopy, 1986
- Intensity measurements of the CH4 bands in the region 4350 Å to 10,600 ÅJournal of Quantitative Spectroscopy and Radiative Transfer, 1978
- Das Rotationsschwingungsspektrum des Wasserdampfes. IIThe European Physical Journal A, 1933
- Das Rotationsschwingungsspektrum des MethansThe European Physical Journal A, 1933
- A New Band in the Absorption Spectrum of Methane GasPhysical Review B, 1930