Erratum: Photoionization Cross Sections of He and H2

Details Erratum: Photoionization Cross Sections of He and H2 Erratum: Photoionization Cross Sections of He and H2

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...559.1194y&link_type=abstract

The Astrophysical Journal, Volume 559, Issue 2, pp. 1194-1194.

Astronomy and Astrophysics

Astrophysics

9

Scientific paper

In the paper ``Photoionization Cross Sections of He and H2'' by M. Yan, H. R. Sadeghpour, and A. Dalgarno (ApJ, 496, 1044 [1998]), the analytic representation of the H2 photoionization cross sections (eqs. [17]-[19]) is given incorrectly. The cross sections for H2 may be represented analytically by σH2(E)=107(1-197.448x-0.5+ 438.823x-1-260.481x-1.5+17.915x-2) barns for 15.485 eV. The sum rules and the tabulated photoionization cross sections in Tables 6 and 7 are correct. The errors were drawn to our attention by the paper of J. Wilms, A. Allen, and R. McCray (ApJ, 542, 914 [2000]). We point out that our recommended cross sections are constructed from the best available experimental and calculated data and modified to ensure that several sum rules are satisfied and to conform to the correct physical high-energy limit. We emphasize that the asymptotic ratio of the nonrelativistic photoionization cross sections of H2 and H is given exactly as (σH2)/ (σH) =4π<δ(r1a)>, where <δ(r1a)> is the delta function matrix element at the position of nucleus a for electron 1. The numerical value of the ratio of cross sections is σH2/ σH=2.833 at high energies. As noted by us and by Wilms, Allen, and McCray, where molecular hydrogen contributes to the total photoabsorption, this excess of the ratio over 2 can be important.

Affiliated with

Also associated with

No associations

Rating

Erratum: Photoionization Cross Sections of He and H2 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 Erratum: Photoionization Cross Sections of He and H2, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Erratum: Photoionization Cross Sections of He and H2 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1103536