High-Resolution Measurements of HBr Transitions in the First Overtone Band Using Tunable Diode Lasers

✍ Scribed by Shang-I Chou; Douglas S. Baer; Ronald K. Hanson

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 116 KB
• Volume: 200
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1999.8038

✦ Synopsis

High-resolution absorption lineshapes of the R(7) and P(2) transitions in the first overtone (v ϭ 0 -2) band of H 79 Br have been recorded at room temperature using a pair of distributed feedback diode lasers operating near 1.95 and 2.00 m, respectively. Spectral line intensities and self-broadening coefficients were determined by fitting the measured spectra (for various pressures P ϭ 10-100 Torr) with Voigt profiles and compared with values in the literature. Measured line intensities for the P(2) and R( 7) transitions are ϳ11 and 16% higher than those listed in the HITRAN database, respectively. The measured self-broadening coefficient of the P(2) transition is ϳ14% lower than the value listed in HITRAN. Measurements of the P(2) lineshapes at low pressure (100 mTorr) were modeled with eight-line Gaussian profiles based on ground state (v ϭ 0) hyperfine constants to include the effects of nuclear electric quadrupole interactions.