High-Resolution Oscillator Strength Measurements of the CO B^1Sigma^+-X^1Sigma^+ (0, 0) and (1, 0) Vibrational Bands

Details High-Resolution Oscillator Strength Measurements of the CO B^1Sigma^+-X^1Sigma^+ (0, 0) and (1, 0) Vibrational Bands High-Resolution Oscillator Strength Measurements of the CO B^1Sigma^+-X^1Sigma^+ (0, 0) and (1, 0) Vibrational Bands

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...520..732s&link_type=abstract

The Astrophysical Journal, Volume 520, Issue 2, pp. 732-736.

Astronomy and Astrophysics

Astronomy

6

Ism: Molecules, Molecular Data, Ultraviolet: Ism

Scientific paper

Large discrepancies in the published photoabsorption oscillator strengths of the vacuum-ultraviolet (VUV) bands of CO hamper the interpretation of VUV astronomical observations. We report new oscillator strength measurements of the (0, 0) and (1, 0) bands of the CO B^1Sigma^+-X^1Sigma^+ electronic system determined from high-resolution (resolving power ~750,000) absorption spectra recorded with a tunable VUV laser system. The instrumental bandwidth (~0.14 cm^-1 FWHM) was significantly less than the widths of the Doppler-broadened CO lines (~0.20 cm^-1 FWHM). The B(0)-X(0) and B(1)-X(0) band oscillator strengths, derived from measurements of the photoabsorption cross sections of 36 individual rotational lines, are (6.5+/-0.6)x10^-3 and (1.1+/-0.1)x10^-3, respectively. Our results are compared with other recent laboratory measurements and with ab initio calculations.

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