High-Resolution Oscillator Strength Measurements for High-v' Bands of the A^1Pi(v')-X^1Sigma^+(v" = 0) System of Carbon Monoxide

Details High-Resolution Oscillator Strength Measurements for High-v' Bands of the A^1Pi(v')-X^1Sigma^+(v" = 0) System of Carbon Monoxide High-Resolution Oscillator Strength Measurements for High-v' Bands of the A^1Pi(v')-X^1Sigma^+(v" = 0) System of Carbon Monoxide

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...505..452s&link_type=abstract

The Astrophysical Journal, Volume 505, Issue 1, pp. 452-458.

Astronomy and Astrophysics

Astronomy

10

Molecular Data, Ism: Molecules, Ultraviolet: Ism

Scientific paper

Band oscillator strengths for six bands of the CO A^1Pi(v')-X^1Sigma^+(v" = 0) system with 13 <= v' <= 21 have been determined from high-resolution (resolving power ~750,000) absorption spectra recorded with a tunable vacuum ultraviolet (VUV) laser system. The instrumental bandwidth of the system, ~0.11 cm^-1 FWHM, was significantly less than the widths of the Doppler-broadened CO lines (~0.20 cm^-1 FWHM). Integrated cross sections of individual rotational lines were determined by a least-squares fitting routine, taking into account the effects of the finite instrumental resolution on the measured absorption features. Our derived f-values for the A(13)-X(0), A(14)-X(0), and A(16)-X(0) bands are consistent with other recent measurements, with the ab initio electronic transition moment calculations of Kirby & Cooper, and with f-values derived from the ab initio electronic transition moment calculations of Spielfiedel & Feautrier cited by Jolly et al. Our f-values for the A(18)-X(0), A(20)-X(0), and A(21)-X(0) bands, the first directly measured values for these bands, progressively deviate from band oscillator strengths derived from the electronic transition moment function of Kirby & Cooper. In addition, a pressure-broadening coefficient of (3.1 +/- 0.6) x 10^-4 cm^-1 torr^-1 was determined for room-temperature CO-CO collisions.

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