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Excited‐State Dynamics of CS2 Studied by Photoelectron Imaging with a Time Resolution of 22 fs |
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| Authors: | Takao Fuji Yoshi‐Ichi Suzuki Takuya Horio Toshinori Suzuki |
| Institution: | 1. CREST, Japan Science and Technology Agency, Sanbancho, Chiyoda‐ku, Tokyo 102‐0075 (Japan), Fax: (+81)?75‐753‐3974;2. Advanced Science Institute, RIKEN, 2‐1 Hirosawa, Wako 351‐0198 (Japan);3. Present Address: Institute for Molecular Science Myodaiji, , Okazaki 444‐8585 (Japan);4. Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606‐8502 (Japan) |
| Abstract: | The ultrafast dynamics of CS2 in the 1B2(1Σu+) state was studied by photoelectron imaging with a time resolution of 22 fs. The photoelectron signal intensity exhibited clear vibrational quantum beats due to wave packet motion. The signal intensity decayed with a lifetime of about 400 fs. This decay was preceded by a lag of around 30 fs, which was considered to correspond to the time for a vibrational wave packet to propagate from the Franck–Condon region to the region where predissociation occurred. The photoelectron angular distribution remained constant when the pump–probe delay time was varied. Consequently, variation of the electronic character caused by the vibrational wave packet motion was not identified within the accuracy of our measurements. |
| Keywords: | carbon disulfide photochemistry photoelectron spectroscopy photoionization wave packet dynamics |