dorsal/arxiv
View SchemaPhotonic superdiffusive motion in resonance line radiation trapping - partial frequency redistribution effects
| Authors | A. R. Alves-Pereira, E. J. Nunes-Pereira, J. M. G. Martinho, M. N. Berberan-Santos |
|---|---|
| Categories | |
| ArXiv ID | physics/0701209 |
| URL | https://arxiv.org/abs/physics/0701209 |
Abstract
The relation between the jump length probability distribution function and the spectral line profile in resonance atomic radiation trapping is considered for Partial Frequency Redistribution (PFR) between absorbed and reemitted radiation. The single line Opacity Distribution Function [M.N. Berberan-Santos et.al. J.Chem.Phys. 125, 174308 (2006)] is generalized for PFR and used to discuss several possible redistribution mechanisms (pure Doppler broadening, combined natural and Doppler broadening and combined Doppler, natural and collisional broadening). It is shown that there are two coexisting scales with a different behavior: the small scale is controlled by the intricate PFR details while the large scale is essentially given by the atom rest frame redistribution asymptotic. The pure Doppler and combined natural, Doppler and collisional broadening are characterized by both small and large scale superdiffusive Levy flight behaviors while the combined natural and Doppler case has an anomalous small scale behavior but a diffusive large scale asymptotic. The common practice of assuming complete redistribution in core radiation and frequency coherence in the wings of the spectral distribution is incompatible with the breakdown of superdiffusion in combined natural and Doppler broadening conditions.
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"abstract": "The relation between the jump length probability distribution function and\nthe spectral line profile in resonance atomic radiation trapping is considered\nfor Partial Frequency Redistribution (PFR) between absorbed and reemitted\nradiation. The single line Opacity Distribution Function [M.N. Berberan-Santos\net.al. J.Chem.Phys. 125, 174308 (2006)] is generalized for PFR and used to\ndiscuss several possible redistribution mechanisms (pure Doppler broadening,\ncombined natural and Doppler broadening and combined Doppler, natural and\ncollisional broadening). It is shown that there are two coexisting scales with\na different behavior: the small scale is controlled by the intricate PFR\ndetails while the large scale is essentially given by the atom rest frame\nredistribution asymptotic. The pure Doppler and combined natural, Doppler and\ncollisional broadening are characterized by both small and large scale\nsuperdiffusive Levy flight behaviors while the combined natural and Doppler\ncase has an anomalous small scale behavior but a diffusive large scale\nasymptotic. The common practice of assuming complete redistribution in core\nradiation and frequency coherence in the wings of the spectral distribution is\nincompatible with the breakdown of superdiffusion in combined natural and\nDoppler broadening conditions.",
"arxiv_id": "physics/0701209",
"authors": [
"A. R. Alves-Pereira",
"E. J. Nunes-Pereira",
"J. M. G. Martinho",
"M. N. Berberan-Santos"
],
"categories": [
"physics.atom-ph",
"physics.chem-ph"
],
"title": "Photonic superdiffusive motion in resonance line radiation trapping - partial frequency redistribution effects",
"url": "https://arxiv.org/abs/physics/0701209"
},
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