Wavenumber Measurements of CO2 Transitions in 1.5-μm Atmospheric Window Using an External-Cavity Diode Laser
✍ Scribed by Che-Chung Chou; Tyson Lin; Jow-Tsong Shy
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 150 KB
- Volume
- 205
- Category
- Article
- ISSN
- 0022-2852
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✦ Synopsis
Using an external-cavity diode laser (ECDL) as the light source, we have observed the spectrum of CO 2 in the 1.5-m atmospheric window including the (30 0 1) I 4 (00 0 0) and (31 1 1) I 4 (01 1 0) I bands. Good signal-to-noise ratio allowed us to lock the frequency of our ECDL to the absorption line centers. Wavenumber measurements of the transitions with accuracy about 6.6 ϫ 10 Ϫ4 cm Ϫ1 are made with the help of a precision wavemeter calibrated to the accurate C 2 H 2 frequency references in the 1.5-m wavelength region. Molecular constants are obtained by making the least-squares fits of the measured transition wavenumbers. The rotational and centrifugal distortion constants are consistent with the previous results using high-resolution Fourier transform spectroscopy. However, the band centers are different with previous results by several thousandth reciprocal centimeters.