Diode laser spectroscopy of methane overtone transitions
Authors: Lucchesini A., Longo I., Gabbanini C., Gozzini S., Moi L.
Autors Affiliation: Istituto di Fisica Atomica e Molecolare del Consiglio Nazionale delle Recerche, Universita di Siena, Via del Giardino, 7 I-56127, Italy; Dipartimento di Fisica, Universita di Siena, Banchi di Sotto, 55I-53100, Italy
Abstract: With the aid of commercial room-temperature AlGaAs diode lasers, frequency modulation absorption spectroscopy was performed on the 7900 angstrom and 8600 angstrom rovibrational combination overtone bands of methane. Three weak transitions are reported in the range around 8610 angstrom 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 angstrom) 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.
Journal/Review: APPLIED OPTICS
Volume: 32 (27) Pages from: 5211 to: 5216
KeyWords: Diode laser spectroscopy; Environmental control; Overtone absorption spectroscopyDOI: 10.1364/AO.32.005211Citations: 25data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2021-12-05References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here