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Perturbation-Facilitated Optical–Optical Double-Resonance Spectroscopy of the 1u(1D) and 2u(1D) Ion-Pair States of I2 through the Parity Mixing Intermediate State

✍ Scribed by Satoshi Motohiro; Akimitsu Umakoshi; Takashi Ishiwata

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
148 KB
Volume
208
Category
Article
ISSN
0022-2852

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✦ Synopsis

We have analyzed the 1 u ( 1 D) and 2 u ( 1 D) ion-pair states of I 2 by perturbation-facilitated optical-optical double resonance using the B 3 (0 + u ) ∼ c1 g mixing state as an intermediate. The double-resonance spectra exhibited the strong vibrational progression to the 1 u ( 1 D) state in accord with the = 0 propensity rule for the valence to ion-pair state transitions. With the state selection in the intermediate state, each progression shows a simple rotational structure consisting of P and R doublets, while the extra lines were found in some vibrational states. We interpreted the occurrence of the extra lines as the interaction with the 2 u ( 1 D) state lying closely and extended our observation to its lower vibrational states. Finally we identified the 1 u ( 1 D) state in the 0 ≤ v ≤ 31 range and the 2 u ( 1 D) state in the 0 ≤ v ≤ 9 range, and analyzed their energy levels including the heterogenous interaction. The 1 u ( 1 D)-2 u ( 1 D) interaction was found to be described in the pure precession approximation and the precious molecular constants were reported for the 1 u ( 1 D) and 2 u ( 1 D) ion-pair states.

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