Complete measurements of two-photon ionization of atomic rubidium using elliptically polarized light
Complete measurements of two-photon ionization of atomic rubidium using elliptically polarized light
复制标题
使用椭圆偏振光完整测量原子铷的双光子电离
DOI：
10.1103/physreva.62.053404
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发表时间：
2000
影响因子：
2.9
通讯作者：
D. Elliott
中科院分区：
文献类型：
--
作者：
Zheng;D. Elliott
我们详细报告我们的完整表征原子光电离通过一个单一的测量，即，双光子光电子角分布使用椭圆偏振光。通过这些测量，我们能够确定明确描述铷原子双光子电离所需的原子参数。这些参数包括光电离进入各个输出通道的相对横截面以及连续谱S和D分波之间的相位差。我们提出了一个推导的角度分布与任意偏振光在这些横截面和相位，证明了使用椭圆偏振光的优点，讨论了实验的细节，并报告了我们的测量结果在本文中。虽然测得的相位差是在良好的协议与预期值在整个范围内的光电子动能的测量从0到0.5 eV，光电离到两个D通道的横截面的比率是异常的，这表明意想不到的精细结构的影响，在这些连续。
We report in detail our complete characterization of atomic photoionization via a single measurement, namely, that of the two-photon photoelectron angular distribution using elliptically polarized light. Through these measurements we are able to determine the atomic parameters necessary to unambiguously describe two-photon ionization of atomic rubidium. These parameters include relative cross sections for photoionization into various outgoing channels as well as the phase difference between the continuum S and D partial waves. We present a derivation of the angular distribution with arbitrarily polarized light in terms of these cross sections and phases, demonstrate the advantages of using elliptically polarized light, discuss details of the experiment, and report the results of our measurements in this paper. While measured phase differences are in excellent agreement with expected values over the entire range of photoelectron kinetic energy of our measurements from 0 to 0.5 eV, ratios of cross sections for photoionization into the two D channels are anomalous, suggesting unexpected fine structure effects in these continua.