Optical-Optical Double Resonance Spectroscopy of the Cl2 0+u(3P0) Ion-Pair State

✍ Scribed by T. Ishiwata; T. Kusayanagi; I. Tanaka

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 417 KB
• Volume: 173
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1995.1256

✦ Synopsis

We have reinvestigated the (0_{u}^{+}\left({ }^{3} P_{0}\right)) ion-pair state of (\mathrm{Cl}{2}) correlating to (\mathrm{Cl}^{-}\left({ }^{1} S\right)+\mathrm{Cl}^{+}\left({ }^{3} P{0}\right)) by optical-optical double resonance. The (\mathrm{Cl}{2}) molecules in the (X^{1} \Sigma{g}^{+})ground state were pumped to the (B^{3} \Pi\left(0_{u}^{+}\right))state, and subsequently excited into the ion-pair states using a coherent two-photon transition. Double resonance spectra recorded at (0.04 \mathrm{~cm}^{-1}) resolution reveal perturbations in the (0_{u}^{+}\left({ }^{3} P_{0}\right)) state caused by couplings with several vibronic states. Among them, homogeneous interaction with the (0_{u}^{+}\left({ }^{3} P_{2}\right)) state was found to be important in understanding the irregular rotational constants and vibrational intervals. Improved molecular parameters for the (0_{u}^{+}\left({ }^{3} P_{0}\right)) state have been obtained from data for (0 \leqslant v \leqslant 6) and (0 \leqslant J \leqslant 54) and have been used to construct an RKR potential function. (C) 1995 Academic Press, Inc.