Investigation of multiphoton and tunneling ionization of atoms in intense laser field

doi:10.1088/1674-1056/21/11/113101

Abstract We study the ionization probabilities of atoms by a short laser pulse with three different theoretical methods, i.e. the numerical solution of time-dependent Schrödinger equation (TDSE), Perelomov-Popov-Terent'ev (PPT) theory and Ammosov-Delone-Krainov (ADK) theory. Our results show that laser intensity dependent ionization probabilities of several atoms (i.e. H, He, and Ne) obtained from the PPT theory accord quite well with the TDSE results both in the multiphoton and tunneling ionization regimes, while the ADK results fit well to the TDSE data only in the tunneling ionization regime. Our calculations also show that laser intensity dependent ionization probabilities of H atom at three different laser wavelengths of 600 nm, 800 nm, and 1200 nm obtained from the PPT theory are also in good agreement with those from the TDSE, while the ADK theory fails to give the wavelength dependence of ionization probability. Only when the laser wavelength is long enough, will the results of ADK be close to those of TDSE.

Keywords: intense laser field ionization probability multiphoton ionization theory

Received: 02 April 2012
Revised: 26 April 2012
Accepted manuscript online:

PACS:	31.15.xg	(Semiclassical methods)
	32.80.Fb	(Photoionization of atoms and ions)
	34.80.Dp	(Atomic excitation and ionization)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11044007, 11164025, and 11064013), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant Nos. 20096203110001 and 20116203120001), and the Foundation of Northwest Normal University, China (Grant No. NWNU-KJCXGC-03-62).

Corresponding Authors: Zhou Xiao-Xin
E-mail: zhouxx@nwnu.edu.cn

Cite this article:

Fu Yan-Zhuo (付妍卓), Zhao Song-Feng (赵松峰), Zhou Xiao-Xin (周效信 ) Investigation of multiphoton and tunneling ionization of atoms in intense laser field 2012 Chin. Phys. B 21 113101

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Investigation of multiphoton and tunneling ionization of atoms in intense laser field

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