Optical-Optical Double-Resonance Spectroscopy of the I2 0+g(1D) Ion-Pair State

✍ Scribed by T. Ishiwata; J. Yamada; K. Obi

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 394 KB
• Volume: 158
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1993.1068

✦ Synopsis

The (0_{g}^{+}\left({ }^{1} D\right)) ion-pair state of (\mathrm{I}{2}) has been analyzed by optical-optical double-resonance using the (0{g}^{+}\left({ }^{1} D\right)-B^{3} \Pi\left(0_{u}^{+}\right)-X^{1} \Sigma_{g}^{+})photoexcitation sequence. The analysis of the 374 transitions in the (0 \leqslant v \leqslant 20) and (9 \leqslant J \leqslant 117) range yields a set of molecular parameters in a Dunham-lype expansion: (Y_{00}=55409.954(3), Y_{10}=97.0979(11), Y_{20}=-0.19360(12), Y_{30}=2.781(35) \times) (10^{-4}, Y_{01}=0.01815891(64), Y_{11}=-3.362(12) \times 10^{-5}, Y_{21}=-1.65(66) \times 10^{-8}), and (Y_{02}=) (-2.639(40) \times 10^{-9}) (all in (\mathrm{cm}^{-1}) and (\sigma) in parentheses). An RKR potential is constructed based on these constants, and used to interpret the (0_{g}^{+}\left({ }^{1} D\right)-B^{3} \Pi\left(0_{u}^{+}\right))emission. We also observed a highly vibrational excited (0_{g}^{+}\left({ }^{3} P_{0}\right)) state, whose molecular constants valid up to (v=101) are reported. (c) 1993 Academic Press. Inc.