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Successsive resonance-enhanced two-photon ionization of elements abundant in nebulae. I. Atoms and ions of C, N, and O

Johansson, Sveneric LU and Letokhov, Vladilen LU (2001) In Astronomy & Astrophysics 375(1). p.319-327
Abstract
We discuss resonance-enhanced two-photon ionization (RETPI) and presentschemes of successive RETPI of the elements C, N, and O in nebulae.RETPI is activated by intrinsic radiation stored in the form of trappedspectral lines of HI, HeI, and HeII in the optically thick nebula. Therate of this two-step photoionization is comparable with or exceeds thelow recombination rate of the photoions formed in the process. Thisleads to an accumulation of photoions and subsequent RETPI until suchhighly charged ions are formed that they cannot further be ionized inthis way by the intrinsic radiation from the strong spectral lines ofHI, HeI, and HeII. Erratum: http://lu-research.lub.lu.se/php/gateway.php?who=lr&method=getfile&file=archive/00017447/
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
PLANETARY NEBULAE: GENERAL, ATOMIC PROCESSES, RADIATION MECHANISMS
in
Astronomy & Astrophysics
volume
375
issue
1
pages
319 - 327
publisher
EDP Sciences
ISSN
0004-6361
DOI
language
English
LU publication?
yes
id
f9743de0-3931-4fdf-9441-24685c1f0517 (old id 130157)
date added to LUP
2007-07-13 12:01:51
date last changed
2018-05-29 11:40:14
@article{f9743de0-3931-4fdf-9441-24685c1f0517,
  abstract     = {We discuss resonance-enhanced two-photon ionization (RETPI) and presentschemes of successive RETPI of the elements C, N, and O in nebulae.RETPI is activated by intrinsic radiation stored in the form of trappedspectral lines of HI, HeI, and HeII in the optically thick nebula. Therate of this two-step photoionization is comparable with or exceeds thelow recombination rate of the photoions formed in the process. Thisleads to an accumulation of photoions and subsequent RETPI until suchhighly charged ions are formed that they cannot further be ionized inthis way by the intrinsic radiation from the strong spectral lines ofHI, HeI, and HeII. Erratum: http://lu-research.lub.lu.se/php/gateway.php?who=lr&method=getfile&file=archive/00017447/},
  author       = {Johansson, Sveneric and Letokhov, Vladilen},
  issn         = {0004-6361},
  keyword      = {PLANETARY NEBULAE: GENERAL,ATOMIC PROCESSES,RADIATION MECHANISMS},
  language     = {eng},
  number       = {1},
  pages        = {319--327},
  publisher    = {EDP Sciences},
  series       = {Astronomy & Astrophysics},
  title        = {Successsive resonance-enhanced two-photon ionization of elements abundant in nebulae. I. Atoms and ions of C, N, and O},
  url          = {http://dx.doi.org/},
  volume       = {375},
  year         = {2001},
}