Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002nla..work...70m&link_type=abstract
NASA Laboratory Astrophysics Workshop, held May 1-3 2002 at NASA Ames Research Center, Moffett Field, CA 94035-1000. Publisher:
Astronomy and Astrophysics
Astrophysics
Scientific paper
Photoionization is of great importance in astrophysical modeling. Much effort has gone into calculations for outer shells, e.g., the Opacity Project [1], using methods which include extensive correlation effects; inner shells are treated using simple independent particle model (IPM) calculations [2]. Recently, however, it has been shown that correlation is significant for photoionization at x-ray energies and for inner shells [3,4]; correlation, in the form of interchannel coupling [5], is important for most subshells, of most atoms, at most energies [6]. With increasing stage of ionization correlation becomes increasingly less important compared to the nuclear Coulomb interaction. A research program has been initiated to quantify the effects of interchannel coupling in ionic photoionization, thereby assessing existing photoionization data bases in the x-ray region, using Relativistic Random-Phase-Approximation (RRPA) methodology [7,8] which includes significant aspects of correlation, including interchannel coupling. Calculations have been performed on the neon isoelectronic sequence as test case which show that at the higher energies, the interaction of the larger 2s cross section with the smaller 2p cross section modifies the former by a factor of about 1.4 in neutral neon, and this modification decreases monotonically to about 1.1 in neon-like iron. Based upon these results, we conclude that interchannel coupling must be taken into account for the photoionization of low-charge ions. This work was supported by NASA and NSF.
Chakraborty Himadri S.
Deshmukh Pranawa C.
Manson Steven T.
No associations
LandOfFree
Interchannel Coupling in the Photoionization of Ions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Interchannel Coupling in the Photoionization of Ions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interchannel Coupling in the Photoionization of Ions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1192784