Determination of the Pseudo Continuum for the Visible Methane Bands at 543 and 619 nm*

Details Determination of the Pseudo Continuum for the Visible Methane Bands at 543 and 619 nm* Determination of the Pseudo Continuum for the Visible Methane Bands at 543 and 619 nm*

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aps..ohi...b04e&link_type=abstract

American Physical Society, Ohio Section Spring Meeting, April 13, 1996, abstract #B.04

Physics

Scientific paper

Improved quantitative values of the methane absorption coefficient in the visible and near infrared spectral regions are of vital importance in the modeling of the atmospheres of the outer planets and their satellites. We have extended previous laboratory measurements made of the temperature dependent absorption coefficient of the visible methane bands at 619nm and 543nm. Spectra were obtained using a tunable dye laser system operating with a line width of 0.016 cm-1 coupled to a cooled 3 meter base-length White-type cell of novel design, which was adjusted for an optical path of 288 meters for the 619 nm band and 582 meters for the band at 543 nm. These measurements were made at gas densities of 1.22, 0.74, and 0.25 amagats and at four temperatures down to -150 C (123K). The absorption coefficient was determined over a wavelength interval from 600 to 640 nm and 527 to 560 nm respectively at 0.1 nm intervals with careful attention paid to the absorption in the pseudo-continuum regions at the extremities of each band. In these regions the extremely weak absorption was measured as a function of gas density at a specific wavelength as the methane was systematically frozen out of the absorption cell. *Supported by NASA Planetary Atmospheres Program Grant NAGW-1765 and the W.M. Keck Foundation.

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