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Dual Mechanism for CO(A 1 Π)‐CO(X 1 ∑ + ) Rovibronic Energy Transfer: An OODR‐MP1 Spectroscopic Study
Author(s) -
He Jinbao,
Sha Cuohe,
Jiang Bo,
Zhang Cunhao
Publication year - 1995
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199500038
Subject(s) - chemistry , dipole , energy transfer , atomic physics , range (aeronautics) , molecule , chemical physics , physics , materials science , organic chemistry , composite material
The highly versatile OODR‐MPI technique is used, mostly without resort to isotope tagging, to study the quantum state specific rovibronic energy transfer between molecules of the same species, specifically CO(A)‐CO(XJ. Two types of rovibronic energy transfer mechanisms are found to be prevailing and are differentiated experimentally, i.e., the long range near resonant dipole‐dipole interactions and the short range exciplex formation. The first type is characterized, at first unexpectedly, by its compliance to the selection rules of optical dipole transitions, ΔJ = 0, ±1 and parity + ⟷ −. Numerical computation procedures are presented for the calculation of rovibronic energy transfer cross‐sections when the two types of mechanism are operating concurrently. The computed results and their variation with J are in good accord with the experiments.