Optical-Optical Double-Resonance Spectroscopy of Cl2: Analyses of the 0+u, 1u, and 2u(3P2) Ion-Pair States

✍ Scribed by T. Ishiwata; T. Shinzawa; J.H. Si; K. Obi; I. Tanaka

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 741 KB
• Volume: 166
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1994.1198

✦ Synopsis

The optical-optical double-resonance spectroscopy is applied to study the ion-pair states of (\mathrm{Cl}{2}) correlating to (\mathrm{Cl}^{-}\left({ }^{1} S\right)+\mathrm{Cl}^{+}\left({ }^{3} P{2}\right)). In the ((1+2)) photoexcitation sequence, we gain access to the (0_{u}^{+}\left({ }^{3} P_{2}\right)) and (\mathrm{I}{u}\left({ }^{3} P{2}\right)) ion-pair states through the (A^{3} \Pi\left(1_{u}\right)) and (B^{3} \Pi\left(0_{u}^{+}\right))states as intermediates. These states are found to lie closely together and show strong heterogeneous coupling with each other. The transitions to the nearby (2_{\mathrm{u}}\left({ }^{3} P_{2}\right)) state are first noticed as extra lines through the mixing with the (1_{u}\left({ }^{3} P_{2}\right)) state. and the observations are extended by the perturbation-facilitated opticaloptical double-resonance technique. The energy levels of the (0_{u}^{+}, 1_{u}), and (2_{u}\left({ }^{3} P_{2}\right)) states are analyzed in detail by including the heterogeneous interaction between these states. The electronic structures of the ion-pair states are discussed. These results allow us to map out the ion-pair states and to clear up the puzzle of previously observed states in the (7-\mathrm{eV}) region. 1994 Academic Press. Ins