J/ApJ/526/544 Collision strengths in S III (Tayal+, 1999)
Collision strengths for electron collision excitation of fine-structure
levels in S III
Tayal S.S., Gupta G.P.
<Astrophys. J. 526, 544 (1999)>
=1999ApJ...526..544T 1999ApJ...526..544T
ADC_Keywords: Atomic physics
Keywords: atomic data - atomic processes
Abstract:
Electron collisional excitation strengths for transitions between the
3s23p2 3P0,1,2, 1D2, and 1S0 levels and from these
levels to the fine-structure levels of the excited 3s3p3, 3s23p3d,
3s23p4s, 3s23p4p, and 3s23p4d configurations of S III are
calculated in R-matrix approach. We considered 49 fine-structure
levels arising from the 27 LS 3s23p2 3P, 1D, 1S, 3s3p3
5,3So, 1,3Do, 1,3Po, 3s23p3d 1,3Po, 1,3Do,
1,3Fo, 3s23p4s 1,3Po, 3s23p4p 1,3S, 1,3P, 1,3D,
3s23p4d 1,3Po, and 1,3Do states. These target levels are
represented by fairly extensive configuration-interaction wave
functions. The collision strengths for transitions between
fine-structure levels are calculated by transforming the LS-coupled
K-matrices to K-matrices in an intermediate coupling scheme.
Complicated resonance structures converging to excited state
thresholds are explicitly included in collision strengths. The
effective collision strengths are obtained from the total collision
strengths by integrating over a Maxwellian velocity distribution.
These are tabulated over a wide electron temperature range
(0.5 - 10) x 104 K.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 88 227 Collision Strengths for Transitions in S III
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1 I1 --- LL Lower level of the transition
3- 4 I2 --- UL Upper level of the transition
7- 13 E7.2 --- ColS0.5 ? Effective collision strength at 5000 K
17- 23 E7.2 --- ColS0.8 ? Effective collision strength at 8000 K
27- 33 E7.2 --- ColS1.0 ? Effective collision strength at 10000 K
37- 43 E7.2 --- ColS2.0 Effective collision strength at 20000 K
47- 53 E7.2 --- ColS3.0 Effective collision strength at 30000 K
57- 63 E7.2 --- ColS4.0 Effective collision strength at 40000 K
67- 73 E7.2 --- ColS6.0 Effective collision strength at 60000 K
77- 83 E7.2 --- ColS10 Effective collision strength at 100000 K
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History:
From ApJ electronic edition
(End) Greg Schwarz [AAS] 27-Apr-2000