Absorption and emission line profile coefficients of multilevel atoms-II. Velocity-averaged profile coefficients

Ivan - Hubeny, J. Oxenius, E. Simonneau

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Starting from the atomic profile coefficients of a multilevel atom derived in the previous first part of this paper, we consider the velocity-averaged line profile coefficients appearing in the radiative transfer equation for the important special case that the velocity distribution of atoms in the ground state is Maxwellian and that the streaming of excited atoms is negligible. Elastic velocity-changing collisions of excited atoms with other particles are taken into account in the framework of a strong-collision model. Neglecting stimulated emissions, we obtain explicit, albeit in some cases approximate, expressions for the line profile coefficients of a three-level atom in terms of the specific radiation intensity locally present. The emission and absorption profile coefficients are written in a form that exhibits the various physical effects responsible for deviations of these profiles from complete redistribution. The case of two-level atoms in the presence of elastic collisions with the excited atoms is also treated.

Original languageEnglish (US)
Pages (from-to)495-506
Number of pages12
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Volume29
Issue number6
DOIs
StatePublished - 1983
Externally publishedYes

Fingerprint

velocity distribution
Atoms
coefficients
profiles
atoms
Stimulated emission
collisions
Radiative transfer
stimulated emission
Velocity distribution
radiative transfer
Ground state
radiant flux density
elastic scattering
deviation
Radiation
ground state

ASJC Scopus subject areas

  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

Cite this

@article{b972fb4f56f0488aa5c8fbd4ec100168,
title = "Absorption and emission line profile coefficients of multilevel atoms-II. Velocity-averaged profile coefficients",
abstract = "Starting from the atomic profile coefficients of a multilevel atom derived in the previous first part of this paper, we consider the velocity-averaged line profile coefficients appearing in the radiative transfer equation for the important special case that the velocity distribution of atoms in the ground state is Maxwellian and that the streaming of excited atoms is negligible. Elastic velocity-changing collisions of excited atoms with other particles are taken into account in the framework of a strong-collision model. Neglecting stimulated emissions, we obtain explicit, albeit in some cases approximate, expressions for the line profile coefficients of a three-level atom in terms of the specific radiation intensity locally present. The emission and absorption profile coefficients are written in a form that exhibits the various physical effects responsible for deviations of these profiles from complete redistribution. The case of two-level atoms in the presence of elastic collisions with the excited atoms is also treated.",
author = "Hubeny, {Ivan -} and J. Oxenius and E. Simonneau",
year = "1983",
doi = "10.1016/0022-4073(83)90126-7",
language = "English (US)",
volume = "29",
pages = "495--506",
journal = "Journal of Quantitative Spectroscopy and Radiative Transfer",
issn = "0022-4073",
publisher = "Elsevier Limited",
number = "6",

}

TY - JOUR

T1 - Absorption and emission line profile coefficients of multilevel atoms-II. Velocity-averaged profile coefficients

AU - Hubeny, Ivan -

AU - Oxenius, J.

AU - Simonneau, E.

PY - 1983

Y1 - 1983

N2 - Starting from the atomic profile coefficients of a multilevel atom derived in the previous first part of this paper, we consider the velocity-averaged line profile coefficients appearing in the radiative transfer equation for the important special case that the velocity distribution of atoms in the ground state is Maxwellian and that the streaming of excited atoms is negligible. Elastic velocity-changing collisions of excited atoms with other particles are taken into account in the framework of a strong-collision model. Neglecting stimulated emissions, we obtain explicit, albeit in some cases approximate, expressions for the line profile coefficients of a three-level atom in terms of the specific radiation intensity locally present. The emission and absorption profile coefficients are written in a form that exhibits the various physical effects responsible for deviations of these profiles from complete redistribution. The case of two-level atoms in the presence of elastic collisions with the excited atoms is also treated.

AB - Starting from the atomic profile coefficients of a multilevel atom derived in the previous first part of this paper, we consider the velocity-averaged line profile coefficients appearing in the radiative transfer equation for the important special case that the velocity distribution of atoms in the ground state is Maxwellian and that the streaming of excited atoms is negligible. Elastic velocity-changing collisions of excited atoms with other particles are taken into account in the framework of a strong-collision model. Neglecting stimulated emissions, we obtain explicit, albeit in some cases approximate, expressions for the line profile coefficients of a three-level atom in terms of the specific radiation intensity locally present. The emission and absorption profile coefficients are written in a form that exhibits the various physical effects responsible for deviations of these profiles from complete redistribution. The case of two-level atoms in the presence of elastic collisions with the excited atoms is also treated.

UR - http://www.scopus.com/inward/record.url?scp=0012278753&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0012278753&partnerID=8YFLogxK

U2 - 10.1016/0022-4073(83)90126-7

DO - 10.1016/0022-4073(83)90126-7

M3 - Article

VL - 29

SP - 495

EP - 506

JO - Journal of Quantitative Spectroscopy and Radiative Transfer

JF - Journal of Quantitative Spectroscopy and Radiative Transfer

SN - 0022-4073

IS - 6

ER -