Abstract
Laboratory measurements of line oscillator strengths in the 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)-X 1Σ+(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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