Line Oscillator Strength Measurements in the d(7)-X(0) and e(4)-X(0) bands of CO

Details Line Oscillator Strength Measurements in the d(7)-X(0) and e(4)-X(0) bands of CO Line Oscillator Strength Measurements in the d(7)-X(0) and e(4)-X(0) bands of CO

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apjs..138..305s&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 138, Issue 2, pp. 305-313.

Astronomy and Astrophysics

Astronomy

2

Ism: Molecules, Methods: Laboratory, Molecular Data, Ultraviolet: General

Scientific paper

Laboratory measurements of line oscillator strengths in the ``intersystem'' bands of carbon monoxide currently provide an incomplete data set for the interpretation of astronomical observations in the vacuum ultraviolet region. We report line f-values in two intersystem bands, d3Δ(v=7)-X1Σ+(v=0) at 146.4 nm and e3Σ-(4)-X(0) at 147.1 nm, from photoabsorption spectra recorded with an instrumental resolution of 7.6×10-4 nm (resolving power ~190,000). The high-resolution measurements (1) minimize line saturation effects in the determination of f-values and (2) allow for the direct experimental determination of the f-values of low-J lines that contribute to interstellar absorption features. We compare our measured line f-values with those generated from the intersystem band model of Rostas and coworkers. We find the predictions of relative line f-values within each band to be in agreement with the measurements, but there are discrepancies in the absolute scale. Based on this comparison, we present recommended f-values for low-J rotational lines within each band.

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