Raman depolarization ratios of jet-cooled benzene and its dimer by stimulated Raman—UV optical double-resonance spectroscopy

✍ Scribed by Takayuki Ebata; Mamiko Hamakado; Shoutaro Moriyama; Yoshiyuki Morioka; Mitsuo Ito

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 800 KB
• Volume: 199
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(92)80045-d

✦ Synopsis

By the use of double resonance of stimulated Raman pumping and mass-selected resonance enhanced multiphoton ionization, the depolarization ratios of the Raman bands of jet-cooled benzene and its dimer have been measured for the first time. The depolarization ratio of the totally symmetric ring breathing vibration (mode 1) showed a drastic change upon dimer formation.

We found two kinds of dimer which give different depolarization ratios of p=O.l and 0.02. By applying the model proposed by Hyodo and Fujiyama, the dimers ofp=O. 1 and 0.02 were concluded to be those having different intermolecular distances of 3.6 and 5 A, respectively.