Laboratory absorption spectra of molecules at interstellar cloud temperatures - First measurements on CO at about 97 NM

Details Laboratory absorption spectra of molecules at interstellar cloud temperatures - First measurements on CO at about 97 NM Laboratory absorption spectra of molecules at interstellar cloud temperatures - First measurements on CO at about 97 NM

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252l..13s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 1, Dec. 1991, p. L13-L15. Research supported by Japan Society for the

Astronomy and Astrophysics

Astrophysics

5

Absorption Spectra, Carbon Monoxide, Interstellar Gas, Molecular Clouds, Abundance, Cosmochemistry

Scientific paper

In the 91-100 nm spectral region, where absorption of photons by interstellar CO usually leads to dissociation, laboratory spectra obtained at 295 K show that most CO bands are both overlapped and perturbed. Reliable band oscillator strengths cannot be extracted from such spectra. As a consequence, synthetic extreme-ultraviolet absorption spectra for CO at the low temperatures that prevail in interstellar clouds are uncertain. A supersonic expansion technique has been used to cool CO to 30 K and three bands in the 97-nm region have been studied with high spectral resolution. The measured spectrum at 30 K is in reasonable agreement with some published modeled spectra, but the ratios of integrated cross sections are somewhat different from those determined from low resolution spectra obtained at 295 K, in which the bands are blended.

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