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首页> 外文期刊>The Journal of Chemical Physics >Coherent ultrafast photoelectron spectroscopy in Br_2:An alternative method for measuring DELTA v not= 0 transitions in Rydberg-to-Rydberg excitations
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Coherent ultrafast photoelectron spectroscopy in Br_2:An alternative method for measuring DELTA v not= 0 transitions in Rydberg-to-Rydberg excitations

机译：Br_2中的相干超快光电子光谱：在里德堡-里德堡激发中测量DELTA v not = 0跃迁的另一种方法

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摘要

A two-state vibrational wave packet is prepared in a low-lying 4d[1/2]_(1 or 2)Rydberg state of jet cooled Br_2(4d,v'=3 and v'=4)by two-photon excitation with 266.5 nm pulses from an ultrafast laser.The wave packet is detected by autoionization following excitation with time-delayed 800 nm pulses to the n = 8(v~+=4)and n=9(v~+=3)Rydberg states in the ~2PI_(1/2)angular momentum core state.Autoionization of each state occurs to the ~2PI_(3/2)state of the ion through spin-orbit ionization.Photoelectron spectroscopy is used to differentiate between the n = 8 and n=9 ejected photoelectrons.Detection of the wave packet recurrences via the n= 8 and n = 9 Rydberg states reveals a pi phase-shift difference of the recurrences between the two final states.In each case,DELTA v not= 0 transitions are observed since wave packet recurrences are detected.By fitting the observed phase change of the recurrences with a simple model for the overlap amplitudes and assumptions about the potentials,we estimate,within the context of the model,that approximately 0.6% of the transitions may be attributed to DELTA v = +-1 transitions between the initial Rydberg superposition state and the final Rydberg detection state.[DOI:10.1063/1.2190218]
机译：通过双光子激发，在喷射冷却的Br_2（4d，v'= 3和v'= 4）的低层4d1 / 2 /（1或2）Rydberg态制备二态振动波包用来自超快激光器的266.5 nm脉冲。通过延时800 nm脉冲激发到n = 8（v〜+ = 4）和n = 9（v〜+ = 3）里德堡态，通过电离检测波包在〜2PI_（1/2）角动量核心态下，通过自旋轨道电离使离子的〜2PI_（3/2）态发生自电离，使用光电子能谱区分n = 8和n = 9射出的光电子。通过n = 8和n = 9的Rydberg状态检测波包递归揭示了两个最终状态之间递归的pi相移差。在每种情况下，DELTA v not = 0跃迁是由于检测到了波包重复，因此可以观察到。通过用简单的模型拟合重叠的观察到的重复的相变，并对重叠幅度和电势进行假设，我们可以估算出在模型的上下文中，大约0.6％的跃迁可以归因于初始Rydberg叠加状态和最终Rydberg检测状态之间的DELTA v = + -1跃迁。[DOI：10.1063 / 1.2190218]

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