Keldysh theory of strong-field ionization

2010 ◽  
Vol 88 (4) ◽  
pp. 227-245 ◽  
Author(s):  
Zi Jian Long ◽  
Wing-Ki Liu
Keyword(s):  
Saddle Point ◽  
Strong Field ◽  
Field Approximation ◽  
Field Ionization ◽  
Saddle Point Approximation ◽  
Strong Field Ionization ◽  
Energy Approximation ◽  
Detailed Derivation ◽  
Keldysh Parameter ◽  
Ionization Rates

In this paper, we provide a detailed derivation of the strong-field ionization rates originally developed by Keldysh who introduced the strong-field approximation. Numerical results are presented to examine the saddle-point approximation, the low photoelectron energy approximation, and neglecting the interference terms, which are necessary to arrive at the simple quasistatic result, when the Keldysh parameter becomes very small.

A theoretical study of vibrational effects on strong field ionization of CS2

2018 ◽  
Vol 17 (08) ◽  
pp. 1850052
Author(s):  
Meixia Zhang ◽  
Guangwen Xu ◽  
Guoying Lu ◽  
Peng Song
Keyword(s):  
Theoretical Study ◽  
Strong Field ◽  
Orientation Angle ◽  
Field Ionization ◽  
Vibrationally Excited ◽  
Tunneling Ionization ◽  
Strong Field Ionization ◽  
Vibration Effect ◽  
Primary Contribution ◽  
Ionization Rates

Tunneling ionization of vibrationally excited CS2 molecules in their ground electronic state is calculated using molecular orbital Ammosov–Delone–Krainov theory (MO-ADK) considering bond length-dependence and bond angle-dependence. The tunneling ionization rates and the corresponding electron density are calculated respectively for different initial states. A relationship between laser intensity and the molecular orientation angle is determined and compared with experimental results, showing excellent agreement. Our calculations show that the primary contribution of vibration effect to CS2 in tunneling ionization is due to the symmetric expansion mode.

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