Double-Resonance Spectroscopy on Triplet States of CO

✍ Scribed by R.T. Jongma; M.G.H. Boogaarts; G. Meijer

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 631 KB
• Volume: 165
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1994.1134

✦ Synopsis

Double-resonance spectroscopy is used to investigate the (v^{\prime}=2) level of the (b^{3} \Sigma^{+})state and perturbing high vibrational levels (\left(v^{\prime}=40-42\right)) of the (a^{\prime 3} \Sigma^{+})state of CO. Single rotational levels in the (a^{3} \Pi(v=0)) state are prepared via laser excitation on the Cameron band around (206 \mathrm{~nm}). Cavity-ring-down absorption spectroscopy is used to determine the absolute transition strength of this spin-forbidden transition; a value of (A_{0.0}=41 \pm 10 \mathrm{sec}^{-1}) is obtained. A laser-induced fluorescence study is performed on the metastable triplet state molecules in the region of the (2 \leftarrow 0) band of the Third Positive System of CO. From the analysis of the interacting ({ }^{3} \Sigma^{+})states deperturbed rotational and vibrational constants as well as interaction parameters of these states are obtained. Franck-Condon factors for the transition from (b^{3} \Sigma^{+}\left(v^{\prime}=2\right)) and (\left(v^{\prime}=0\right)) to the (a^{3} \Pi) state are obtained from dispersion measurements. 1994 Academic Press. Inc.