The Dynamics of Molecules in Very Large Electron Orbital

近年来，由于可以用零动能电子能谱（zero kinetic energy electron spectroscopy， ZEKE）来研究超大电子轨道上的分子动力学，这引起了人们的兴趣。超大电子轨道是由共振多光子激光将分子激发到具有高主量子数（n>100）的非常高的里德伯态而产生的。非常高的里德伯态很容易被弱脉冲电场电离，可以被检测到电子倍增。高能级里德伯态的寿命被测量到在几十微秒的范围内，这比低能级里德伯态寿命的简单n^3外推要长得多。这个事实需要一些动力学，这是非常大的电子轨道中分子所特有的。我们开发了一种新型的扫描探针时间分辨双脉冲场电离装置，并获得了里德伯电子与离子核分子振动之间的振动耦合的证据。

The dynamics of molecules in very large electron orbitals is of interest since those molecules can be accessible with the zero kinetic energy (ZEKE) electron spectroscopy recently. The very large electron orbital is created by the resonant multi-photon laser excitation of the molecule to the very high-lying Rydberg states with high principal quantum numbers (n>100). The very high-lying Rydberg states is easily ionized with a weak pulsed electric field and can be detected electron multiplier. The lifetimes of the very high-lying Rydberg states were measured to be in the range of tens of microseconds, which are extraordinarily longer than the simple n^3 extrapolation of the lifetimes of the lower lying Rydberg states. This fact requires some dynamics that is unique to the molecules in very large electron orbital. We developed a novel sweep-off-probe time resolved two pulsed field ionization apparatus, and obtained the evidence showing the vibronic coupling between Rydberg electron and ion-core molecular vibrations.