Absorption and recurrence spectra of hydrogen in crossed electric and magnetic fields
Absorption and recurrence spectra of hydrogen in crossed electric and magnetic fields
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DOI：
10.1103/physreva.65.053408
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发表时间：
2002-05
影响因子：
2.9
通讯作者：
S. Freund;R. Ubert;E. Flöthmann;K. Welge;D. M. Wang;J. Delos
中科院分区：
文献类型：
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作者：
S. Freund;R. Ubert;E. Flöthmann;K. Welge;D. M. Wang;J. Delos
测量了氢原子在交叉电场和磁场作用下的吸收光谱。磁场设为6.002 T，电场设为750 ~ 1000 V/cm几个值。这些观测需要几种不同的理论方法来解释它们：(1)光谱是“无比例的”，递归性很弱，它们的周期随着观测间隔内的能量而变化。这一观察结果促使我们开发了一种啁啾傅立叶变换方法，从测量光谱中提取闭合轨道。(2)吸收光谱由准离散峰叠加在平滑上升连续体上组成。为了解释这一观察结果，我们建立了一个连续吸收的理论模型，并得到了与测量结果一致的结果。(3)实验区分了“提示”电子和“延迟”电子，对应于受激氢原子的寿命分别小于或大于约100ns。(4)在高能量下，测量的吸收光谱包含一些规则的准离散态。我们使用爱因斯坦-布里渊-凯勒量子化方法来识别这些状态，这些状态靠近垂直于磁场的平面。
The absorption spectrum of the hydrogen atom in crossed electric and magnetic fields was measured. The magnetic field was set at 6.002 T, and the electric field was fixed at several values from 750 to 1000 V/cm. The observations require several different theoretical methods for their interpretation: (1) The spectrum is "unscaled," the recurrences are weak, and their periods vary with energy over the interval of the observations. This observation caused us to develop a chirped Fourier transform method to extract closed orbits from the measured spectra. (2) The absorption spectrum consists of quasidiscrete peaks superposed on a smoothly rising continuum. To interpret this observation, a theoretical model of the continuum absorption is created, and we get results consistent with the measurements. (3) The experiments distinguish between "prompt" and "delayed" electrons, corresponding to lifetimes of the excited hydrogen atoms that are, respectively, less than or greater than about 100 ns. (4) At high energies, the measured absorption spectrum contains some regular quasidiscrete states. We use an Einstein-Brillouin-Keller quantization method to identify these as states that lie close to the plane perpendicular to the magnetic field.