A rate equation method for the sequential double ionisation, including autoionising state excitation, of a noble gas

• Authors: Damien Middleton , Katravulapally Tejaswi , Lampros Nikolopoulos
• Languages of publication: EN

Abstracts

EN

A set of rate equations have been tested against a more robust set of Time-Dependent Density Matrix (TDDM) equations [D. P. W. Middleton, L. A. A. Nikolopoulos, J. Mod. Opti. 59, 1650 (2012)] by using them to determine the populations of ion species and autoionising states (AIS) in noble gas atoms when interacting with a strong external field. Two field shapes were tested here - sinusoidal and square - and a variety of pulse characteristics were examined, i.e. intensity, duration and photon energy, for the neon atomic system. It was found that the rate equations were sufficiently accurate only when the external field is way off-resonant with the AIS. Moreover, analytical solutions of the rate equations in the square pulse case agree with the numerical solutions for a time-dependent pulse containing many cycles. An attempt to model a stochastic field was also made and it was found that the use of such a field diminished and broadened the ion yield ratio due to the presence of an added bandwidth.

Keywords

EN

noble gas; autoionising state; neon; rate equation; analytical equation

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2013
• Volume: 11
• Issue: 9
• Pages: 1082-1090

Dates

published

1 - 9 - 2013

online

24 - 11 - 2013

Contributors

author

Damien Middleton

author

Katravulapally Tejaswi

author

Lampros Nikolopoulos

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Identifiers

DOI

10.2478/s11534-013-0232-2