Opened 8 years ago

Last modified 5 years ago

#150 new enhancement

atomic data for S II

Reported by: Gary J. Ferland Owned by:
Priority: minor Milestone:
Component: atomic/molecular data base Version: trunk
Keywords: Cc:

Description

update to

Breit-Pauli Transition Probabilities and Electron Excitation

Collision Strengths for Singly Ionized Sulfur

  1. S. Tayal and O. Zatsarinny 2010 ApJS 188 32-45 Abstract: http://iopscience.iop.org/0067-0049/188/1/32 Full text PDF: http://iopscience.iop.org/0067-0049/188/1/32/pdf/apjs_188_1_32.pdf Full text HTML: http://iopscience.iop.org/0067-0049/188/1/32/fulltext

New improved calculations are reported for transition

probabilities and electron impact excitation collision strengths for the astrophysically important lines in S II. The collision strengths have been calculated in the close-coupling approximation using the B-spline Breit-Pauli R-matrix method. The multiconfiguration Hartree-Fock method with term-dependent non-orthogonal orbitals is employed for an accurate representation of the target wave functions. The close-coupling expansion includes 70 bound levels of S II covering all possible terms of the ground 3s 23p 3 and singly excited 3s3p 4, 3s 23p 23d, 3s 23p 24s, and 3s 23p 24p configurations. The present calculations are more extensive than previous ones, leading to a total 2415 transitions between fine-structure levels. The effective collision strengths are obtained by averaging the electron collision strengths over a Maxwellian distribution of velocities and these are tabulated for all fine-structure transitions at electron temperatures in the range from 5000 to 100,000 K. The present results are compared with a variety of other close-coupling calculations and available experimental data. There is an overall good agreement with the recent 18-state calculations by Ramsbottom, Bell, & Stafford and with the 19-state calculations by Tayal for the most part, but some significant differences are also noted for some transitions.

Change History (2)

comment:1 Changed 7 years ago by Gary J. Ferland

Milestone: C12 releaseC12 branch

Milestone C12 release deleted

comment:2 Changed 5 years ago by Ryan Porter

Milestone: C13 branch
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