J/ApJS/188/32 Breit-Pauli transition probabilities for SII (Tayal+, 2010) ================================================================================ Breit-Pauli transition probabilities and electron excitation collision strengths for singly ionized sulfur. Tayal S.S., Zatsarinny O. =2010ApJS..188...32T ================================================================================ ADC_Keywords: Atomic physics Keywords: atomic data - atomic processes Abstract: New improved calculations are reported for transition probabilities and electron impact excitation collision strengths for the astrophysically important lines in SII. 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 SII covering all possible terms of the ground 3s^2^3p^3^ and singly excited 3s3p^4^, 3s^2^3p^2^3d, 3s^2^3p^2^4s, and 3s^2^3p^2^4p 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 100000K. 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. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 70 70 Energies and lifetimes of the excitation levels table4.dat 90 806 Line strengths, oscillator strengths, and transition probabilities for E1 transitions table5.dat 93 2415 Effective collision strengths for transitions in SII -------------------------------------------------------------------------------- See also: J/A+A/420/783 : Electron impact excitation of Fe XVII (Aggarwal+, 2004) J/A+A/430/725 : N II effective collision strengths (Hudson+, 2005) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- Index [1/70] Index 4- 16 A13 --- Conf Configuration 20- 31 A12 --- LSJ LSJ term 33- 38 F6.3 eV Eexp Expected excitation energy 40- 45 F6.3 eV E Present excitation energy 47- 52 F6.3 eV dE Excitation energy difference (E-Eexp) 54- 61 E8.3 s LF ? Present lifetime 63- 70 E8.3 s LFM ? Breit-Pauli MCHF lifetime (Irimia & Froese Fischer, 2007, Phys. Scr., 71, 172) -------------------------------------------------------------------------------- Byte-by-byte Description of file: table4.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 26 A26 --- Conf.i The i level configuration 28- 53 A26 --- Conf.k The k level configuration 55- 64 F10.2 0.1nm lambda Wavelength in Angstroms 66- 73 E8.4 --- Sik The i-k transition line strength 75- 82 E8.4 --- fik The i-k transition oscillator strength 84- 90 E7.3 s-1 Aki The i-k transition decay probability -------------------------------------------------------------------------------- Byte-by-byte Description of file: table5.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- i [1/69] The i level configuration 3 A1 --- --- [-] transition 4- 5 I2 --- k [2/70] The k level configuration 7- 13 E7.2 --- 0.5CS Effective collision strength at T=5kK 15- 21 E7.2 --- 0.7CS Effective collision strength at T=7kK 23- 29 E7.2 --- 1.0CS Effective collision strength at T=10kK 31- 37 E7.2 --- 1.5CS Effective collision strength at T=15kK 39- 45 E7.2 --- 2.0CS Effective collision strength at T=20kK 47- 53 E7.2 --- 2.5CS Effective collision strength at T=25kK 55- 61 E7.2 --- 3.0CS Effective collision strength at T=30kK 63- 69 E7.2 --- 4.0CS Effective collision strength at T=40kK 71- 77 E7.2 --- 5.0CS Effective collision strength at T=50kK 79- 85 E7.2 --- 7.0CS Effective collision strength at T=70kK 87- 93 E7.2 --- 10CS Effective collision strength at T=100kK -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 09-Jun-2010