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Numerical modeling of radiative recombination during ionization of atoms by means of particle-in-cell simulation

Published online by Cambridge University Press:  29 March 2016

E. Khalilzadeh ,
J. Yazdanpanah ,
J. Jahanpanah  and
A. Chakhmachi
E. Khalilzadeh*
Affiliation:
Department of Physics, Kharazmi University, 49 Mofateh Ave, P. O. Box 15614, Tehran, Iran The Plasma Physics and Fusion Research School, Tehran, Iran
J. Yazdanpanah
Affiliation:
The Plasma Physics and Fusion Research School, Tehran, Iran
J. Jahanpanah
Affiliation:
Department of Physics, Kharazmi University, 49 Mofateh Ave, P. O. Box 15614, Tehran, Iran
A. Chakhmachi
Affiliation:
The Plasma Physics and Fusion Research School, Tehran, Iran
*
Address correspondence and reprint requests to: Elnaz Khalilzadeh, Department of Physics, Kharazmi University, 49 Mofateh Ave, P. O. Box 15614, Tehran, Iran and The Plasma Physics and Fusion Research School, Tehran, Iran. E-mail: [email protected]
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Abstract

In this paper, a heuristic algorithm based on particle-in-cell (PIC) simulation is introduced to investigate the harmonic generation during the ionization and formation of plasma by a non-relativistic laser field when it propagates through hydrogen atoms. The harmonic generation is considered for the radiative recombination of an ionized electron with its nearest ion. The ionization algorithm is improved by considering the Stark effect and nonzero velocity for ionized electrons. Energy conservation is evaluated during the recombination process. In our code, for the first time, Maxwell's equations are integrated for harmonic fields in a separate mesh using the artificial recombination current as a source term. The simulation results are then used to illustrate the intensity spectrum of generated fields. It is shown that the initial momentum of ionized electrons affects the harmonic spectrum because the energy of radiated photons varies with the electron energy.

Keywords

Harmonic generationIonizationMonte CarloParticle-in-cell simulationRadiative recombination
Type
Research Article
Information
Laser and Particle Beams , Volume 34 , Issue 2 , June 2016 , pp. 284 - 293
Copyright
Copyright © Cambridge University Press 2016 

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