Dynamics of excited OCS investigated by resonance-enhanced multiphoton ionization

被引：6
|
作者：
Liu, HP [1 ]
Zhang, JY [1 ]
Ying, SH [1 ]
Xu, DL [1 ]
Jiang, B [1 ]
Wang, L [1 ]
Lou, NQ [1 ]
机构：
[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
来源：
PHYSICAL REVIEW A | 2002年 / 65卷 / 05期
关键词：
D O I：
10.1103/PhysRevA.65.052503
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The predissociation decay behavior of molecule carbonyl sulfide (OCS) has been investigated by resonance-enhanced multiphoton ionization spectroscopy using the pump-probe technique of dichroic femtosecond lasers in real time. The lifetime of excited OCS around 74 720 cm(-1) by two-photon absorption of 268 nm, corresponding to upsilon(1)=1 of the Rydberg state [(2)Pi(1/2)]4ppi((1)Sigma(+)), is directly determined to be tau(D)=1071+/-11 fs. This picosecond decay process indicates that the excited state is predissociative. The temporal information of dissociation enriches the knowledge of the potential-energy surface of the associative excited state.
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页数：5
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