强激光场中氦原子隧穿电离的理论研究。

Theoretical studies on tunneling ionizations of helium atom in intense laser fields.

作者信息

Nagaya K, Mishima K, Hayashi M, Lin S H

机构信息

Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei 106, Taiwan, Republic of China.

出版信息

J Chem Phys. 2006 Apr 14;124(14):144303. doi: 10.1063/1.2183300.

DOI:10.1063/1.2183300

PMID:16626192

Abstract

Our generalized Keldysh theory is applied to the simplest many-electron atom, helium atom. For the single ionization (He-->He(+)+e) we derive a compact rate formula, which does not contain any series summation or integral and thus is as simple as the Ammosov-Delone-Krainov ionization rates. In addition to its simplicity, our formula can explicitly show the wavelength dependence. Furthermore a simple form of the angular distribution of the photoelectron is available. Our compact formula agrees well with both the exact numerical calculations [A. Scrinzi et al., Phys. Rev. Lett. 83, 706 (1999)] and experimental data [B. Walker et al., Phys. Rev. Lett. 73, 1227 (1994)] in the intensity range of I<5x10(15) Wcm(2). In higher intensity regions, we suggest to utilize another simple formula which is valid in the tunneling limit.

摘要

我们的广义凯尔迪什理论应用于最简单的多电子原子——氦原子。对于单电离（He→He⁺+e），我们推导了一个紧凑的速率公式，该公式不包含任何级数求和或积分，因此与阿莫索夫 - 德洛内 - 克拉伊诺夫电离速率一样简单。除了简单性之外，我们的公式可以明确显示波长依赖性。此外，光电子角分布的简单形式也可用。我们的紧凑公式在I<5×10¹⁵ W/cm²的强度范围内与精确的数值计算结果[A. 斯克林齐等人，《物理评论快报》83, 706 (1999)]和实验数据[B. 沃克等人，《物理评论快报》73, 1227 (1994)]都吻合得很好。在更高强度区域，我们建议使用另一个在隧穿极限下有效的简单公式。