High resolution `VUV laser' measurements of the band oscillator strengths of the CO ? transition
Abstract
Band-integrated oscillator strengths of the 0953-4075/30/19/019/img11 transition for 0953-4075/30/19/019/img12 have been measured in absorption using a high-resolution tunable VUV coherent light source (`VUV laser') as a background source. The rotationally resolved absorption spectra are least-squares fitted by precise synthetic spectra in order to take into account the instrumental saturation effects. The fitting parameters are the oscillator strength, the rotational line width and the instrumental width. Saturation effects are reduced by pressure broadening the absorption lines using up to 1.5 bar of argon as a buffer gas. The new data set extends the range covered by recent measurements to 0953-4075/30/19/019/img13. Cross sections for 0953-4075/30/19/019/img14 are measured here for the first time. The present results are in general agreement with the latest measurements and with ab initio calculations. The average broadening coefficient of the CO rotational lines by argon is determined in this study for the first time: 0953-4075/30/19/019/img15. The variation of 0953-4075/30/19/019/img16 with 0953-4075/30/19/019/img17 and J is small and could not be measured in the present experiments.
- Publication:
-
Journal of Physics B Atomic Molecular Physics
- Pub Date:
- October 1997
- DOI:
- 10.1088/0953-4075/30/19/019
- Bibcode:
- 1997JPhB...30.4315J