Abstract
We have reexamined the sequential two-photon absorption of I2 from the X1Σg+ ground state to the lowest D′2g(3P2) ion-pair state using the high vibrational level of the B3Π(0u+) state as an intermediate. The double resonance transition to the D′2g(3P2) state was found to occur through the B3Π(0u+)–b′2u coupled state by hyperfine interaction, which permits to mix the different J levels of different electronic states. We elucidated the B3Π(0u+)–b′2u coupling schemes in the intermediate states. The double resonance spectra recorded for the D′2g(3P2) state in the range v=0–30 were used to determine the absolute energy of the D′2g(3P2) state. The molecular parameters of the D′2g(3P2) state obtained in this study are Y00=40 388.783(2), Y10=103.956 46(57), Y20=−0.207 717(51), Y30=2.199(13)×10−4, Y01=0.020 528 18(62), and Y11=−5.1753(48)×10−5 (all in cm−1 and σ in parentheses). An RKR potential curve constructed using these constants is reported. Combined with the data on the D′2g(3P2)–A′3Π(2u) transition from Zheng et al. (J. Chem. Phys.96, 4877 (1992)), we can locate the A′3Π(2u) v=0 state at 10 096.444(6) cm−1 above the ground state.
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