Radiative Recombination in strong laser field

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Abstract

A theoretical treatment of the laser-assisted radiative recombination (LARR) is presented in which the low-frequency (LF) assumption is exploited. The merit of the proposed LF approximation is twofold. First, the LF approximation considerably simplifies the calculations of the transition rates, whereas the results obtained within this approximation are only slightly different from those obtained without resorting to it. Second, the LF approximation gives more insight into the physical picture of the process, which may be viewed as a two-step process. In the first step, the free electron propagates toward the ion, and its motion is described classically with motion changes ascribed mainly to the action of the laser field; in the second step, the free electron recombines with the ion instantaneously at a given value of the laser field phase phi. Since the instant of recombination is not observed, the instantaneous result is averaged over the laser field phase in order to obtain observable quantities. Finally, the LARR rate is calculated for a plasma in the conditions when electronelectron collisions are dominant and a Maxwellian electron distribution function is appropriate. The basic features of the spectra are explained in a simple way thanks to the simple picture offered by the LF approximation.
Lingua originaleEnglish
pagine (da-a)2076-2082
Numero di pagine7
RivistaJOURNAL OF THE OPTICAL SOCIETY OF AMERICA. B, OPTICAL PHYSICS
Volume22
Stato di pubblicazionePublished - 2005

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics

Cita questo

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title = "Radiative Recombination in strong laser field",
abstract = "A theoretical treatment of the laser-assisted radiative recombination (LARR) is presented in which the low-frequency (LF) assumption is exploited. The merit of the proposed LF approximation is twofold. First, the LF approximation considerably simplifies the calculations of the transition rates, whereas the results obtained within this approximation are only slightly different from those obtained without resorting to it. Second, the LF approximation gives more insight into the physical picture of the process, which may be viewed as a two-step process. In the first step, the free electron propagates toward the ion, and its motion is described classically with motion changes ascribed mainly to the action of the laser field; in the second step, the free electron recombines with the ion instantaneously at a given value of the laser field phase phi. Since the instant of recombination is not observed, the instantaneous result is averaged over the laser field phase in order to obtain observable quantities. Finally, the LARR rate is calculated for a plasma in the conditions when electronelectron collisions are dominant and a Maxwellian electron distribution function is appropriate. The basic features of the spectra are explained in a simple way thanks to the simple picture offered by the LF approximation.",
keywords = "EXPANDED ELECTRON-BEAM ; PULSES",
author = "Gaetano Ferrante and Claudio Leone and Saverio Bivona and Riccardo Burlon",
year = "2005",
language = "English",
volume = "22",
pages = "2076--2082",
journal = "Journal of the Optical Society of America B: Optical Physics",
issn = "0740-3224",
publisher = "The Optical Society",

}

TY - JOUR

T1 - Radiative Recombination in strong laser field

AU - Ferrante, Gaetano

AU - Leone, Claudio

AU - Bivona, Saverio

AU - Burlon, Riccardo

PY - 2005

Y1 - 2005

N2 - A theoretical treatment of the laser-assisted radiative recombination (LARR) is presented in which the low-frequency (LF) assumption is exploited. The merit of the proposed LF approximation is twofold. First, the LF approximation considerably simplifies the calculations of the transition rates, whereas the results obtained within this approximation are only slightly different from those obtained without resorting to it. Second, the LF approximation gives more insight into the physical picture of the process, which may be viewed as a two-step process. In the first step, the free electron propagates toward the ion, and its motion is described classically with motion changes ascribed mainly to the action of the laser field; in the second step, the free electron recombines with the ion instantaneously at a given value of the laser field phase phi. Since the instant of recombination is not observed, the instantaneous result is averaged over the laser field phase in order to obtain observable quantities. Finally, the LARR rate is calculated for a plasma in the conditions when electronelectron collisions are dominant and a Maxwellian electron distribution function is appropriate. The basic features of the spectra are explained in a simple way thanks to the simple picture offered by the LF approximation.

AB - A theoretical treatment of the laser-assisted radiative recombination (LARR) is presented in which the low-frequency (LF) assumption is exploited. The merit of the proposed LF approximation is twofold. First, the LF approximation considerably simplifies the calculations of the transition rates, whereas the results obtained within this approximation are only slightly different from those obtained without resorting to it. Second, the LF approximation gives more insight into the physical picture of the process, which may be viewed as a two-step process. In the first step, the free electron propagates toward the ion, and its motion is described classically with motion changes ascribed mainly to the action of the laser field; in the second step, the free electron recombines with the ion instantaneously at a given value of the laser field phase phi. Since the instant of recombination is not observed, the instantaneous result is averaged over the laser field phase in order to obtain observable quantities. Finally, the LARR rate is calculated for a plasma in the conditions when electronelectron collisions are dominant and a Maxwellian electron distribution function is appropriate. The basic features of the spectra are explained in a simple way thanks to the simple picture offered by the LF approximation.

KW - EXPANDED ELECTRON-BEAM ; PULSES

UR - http://hdl.handle.net/10447/14966

M3 - Article

VL - 22

SP - 2076

EP - 2082

JO - Journal of the Optical Society of America B: Optical Physics

JF - Journal of the Optical Society of America B: Optical Physics

SN - 0740-3224

ER -