Absolute Intensities and Pressure-Broadening Coefficients of 2- m CO 2 Absorption Features: Intracavity Laser Spectroscopy

Details Absolute Intensities and Pressure-Broadening Coefficients of 2- m CO 2 Absorption Features: Intracavity Laser Spectroscopy Absolute Intensities and Pressure-Broadening Coefficients of 2- m CO 2 Absorption Features: Intracavity Laser Spectroscopy

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apopt..40.2551g&link_type=abstract

Applied Optics LP, vol. 40, Issue 15, pp.2551-2560

Physics

Optics

6

Scientific paper

The high detection sensitivity available from intracavity laser spectroscopy (ILS) is extended into the near infrared by solid-state laser systems operating with relatively narrow ( ~0.002 m) bandwidths for three CO2 absorption features of importance to an understanding of planetary atmospheres. The absolute intensities and pressure-broadening properties of theP (12 ), P (14 ), and P (16 ) lines of the band (12 1 -00 0) of CO2 (at 2.0129, 2.0136, and 2.0143 m) are measured quantitatively by ILS with a Tm:YAG laser operating near 2.0 m. The temperature dependencies of these absolute intensities and collisional-broadening parameters for these three CO2 features are also measured over the 110 -300 K range. The 3.0-km equivalent absorption path length available from the ILS Tm:YAG system is used to enhance detection sensitivity by more than a factor of 1.5 x104 while maintaining a physical sample cell path length of ~20 cm. The enhanced detection sensitivity of ILS permits absolute intensities and collisional-broadening parameters to be measured from <1-Torr CO2 over a series of temperatures, conditions that emulate those found in the atmospheres of Mars, Triton, and Venus.

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