School of Chemistry, University of Nottingham, Nottingham NG7 2RD, United Kingdom.
Phys Rev Lett. 2012 Nov 9;109(19):193004. doi: 10.1103/PhysRevLett.109.193004.
We measure quantum beating patterns of photoelectron intensity caused by intramolecular vibrational energy redistribution following the excitation of a low-lying ring breathing state in S(1) parafluorotoluene. Analysis of the beating patterns reveals an exceptional sensitivity to details of the evolving wave packet which is found to contain two incoherent components, one of which rapidly dephases. This analysis enables the determination of coupling matrix elements, which are shown to depend strongly on torsional and rotational quantum numbers.
我们测量了在 para- 氟甲苯 S(1) 态的低能环呼吸激发后，分子内振动能量转移引起的光电子强度量子拍频图案。对拍频图案的分析揭示了对演化波包细节的特殊敏感性，发现该波包包含两个非相干分量，其中一个迅速退相。这种分析能够确定耦合矩阵元，结果表明它们强烈依赖于扭转和转动量子数。
