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Multiphoton ionization of benzene at 193 nm: laser power dependence and isotope effect

✍ Scribed by Yoshihiro Mori; Akiyasu Yoneda; Taiji Kitagawa

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
592 KB
Volume
176
Category
Article
ISSN
0009-2614

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✦ Synopsis

Laser power dependence of multiphoton ionization (MPI) of benzene-d, as well as benzene-h, was observed at 193 nm with an ArF excimer laser. The dependences were analysed by the rate equation model. It was found that t&o-photon ionization occurs mainly from the energy state(s) internally converted from the excited 'B,, state. Furthermore it is very likely that one of the dominant absorbing species of the fourth photon is the C,D: ion formed via a three-photon process. A remarkably different isotope effect and similar laser power dependences of the C,D: and C,D: ions suggest that the C,D: ion is produced from the metastable C,D: ion. Some experimental evidences are given that neutral products largely contribute to the MPI of benzene at 193 nm.

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