Observation of the wavepacket dynamics on the {sup 1}B{sub 2}({sup 1}Σ{sub u}{sup +}) state of CS{sub 2} by sub-20 fs photoelectron imaging using 159 nm probe pulses
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502 (Japan)
The wavepacket dynamics of CS{sub 2} after photoexcitation to the {sup 1}B{sub 2}({sup 1}Σ{sub u}{sup +}) state at 198 nm are studied by time-resolved photoelectron imaging using sub-20 fs 159 nm pulses, which enable single photon ionization from the entire region of the {sup 1}B{sub 2} potential energy surface. The time-energy map of the photoelectron intensity reveals vibrational motions along the symmetric stretching and bending coordinates. The time-energy map of the photoelectron anisotropy parameter exhibits time-evolution within single oscillation periods of the ν{sub 1} and ν{sub 2} modes, which is attributed to variation of the excited state electronic character along these vibrational coordinates. The initially populated {sup 1}B{sub 2} state evolves with two time constants of 107 and 394 fs.
- OSTI ID:
- 22416150
- Journal Information:
- Journal of Chemical Physics, Vol. 142, Issue 7; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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