Spesyvtsev R, Horio T, Suzuki Y-I, Suzuki T
Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
J Chem Phys. 2015 Feb 21;142(7):074308. doi: 10.1063/1.4907749.
The wavepacket dynamics of CS2 after photoexcitation to the (1)B2((1)Σu(+)) 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 (1)B2 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 ν1 and ν2 modes, which is attributed to variation of the excited state electronic character along these vibrational coordinates. The initially populated (1)B2 state evolves with two time constants of 107 and 394 fs.
利用亚20飞秒159纳米脉冲的时间分辨光电子成像技术，研究了CS2在198纳米光激发至(1)B2((1)Σu(+))态后的波包动力学，该技术能够从(1)B2势能面的整个区域进行单光子电离。光电子强度的时间-能量图揭示了沿对称伸缩和弯曲坐标的振动运动。光电子各向异性参数的时间-能量图在ν1和ν2模式的单个振荡周期内呈现时间演化，这归因于激发态电子特性沿这些振动坐标的变化。最初填充的(1)B2态以107和394飞秒的两个时间常数演化。
