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J/ApJ/850/122  Electron-impact multiple-ionization cross sections  (Hahn+, 2017)

Electron-impact multiple-ionization cross sections for atoms and ions of helium through zinc. Hahn M., Muller A., Savin D.W. <Astrophys. J., 850, 122 (2017)> =2017ApJ...850..122H
ADC_Keywords: Atomic physics; References Keywords: atomic data ; atomic processes ; techniques: spectroscopic Abstract: We compiled a set of electron-impact multiple-ionization (EIMI) cross section for astrophysically relevant ions. EIMIs can have a significant effect on the ionization balance of non-equilibrium plasmas. For example, it can be important if there is a rapid change in the electron temperature or if there is a non-thermal electron energy distribution, such as a kappa distribution. Cross section for EIMI are needed in order to account for these processes in plasma modeling and for spectroscopic interpretation. Here, we describe our comparison of proposed semiempirical formulae to available experimental EIMI cross-section data. Based on this comparison, we interpolated and extrapolated fitting parameters to systems that have not yet been measured. A tabulation of the fit parameters is provided for 3466 EIMI cross sections and the associated Maxwellian plasma rate coefficients. We also highlight some outstanding issues that remain to be resolved. Description: Here, we produced a database of electron-impact multiple-ionization (EIMI) cross sections for astrophysics. In order to generate this database, we compared measurements of EIMI cross sections to predictions using the proposed semiempirical formulae. Table 1 gives the references for all of the experimental data sources that we consulted. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . this file table1.dat 135 175 Experimental EIMI data sources table2.dat 68 3466 Fitting formulae for EIMI cross sections table5.dat 151 3466 Fitting parameters for Maxwellian rate coefficients refs.dat 249 48 References
See also: J/A+AS/97/443 : Fluorescence for Be to Zn (Kaastra+ 1993) J/A+A/410/359 : Radiative and Auger decay for Fe II-Fe IX (Palmeri+, 2003) J/A+A/414/377 : FeX-FeXVII fine-structure K-vacancy levels (Mendoza+, 2004) J/ApJS/167/343 : Plasma Recombination rate coefficients (Bryans+, 2006) J/A+A/466/771 : Ionization rate coefficients for elements H-Zn (Dere+, 2007) J/ApJS/185/477 : N K-shell photoabsorption (Garcia+, 2009) J/A+A/525/A59 : Atomic data for Al ions (Palmeri+, 2011) J/ApJ/760/80 : Fe9+ and Fe10+ cross-section measurements (Hahn+, 2012) J/A+A/543/A44 : Atomic data for iron peak & light odd-Z ions (Palmeri+, 2012) J/ApJ/767/47 : Fe13+, Fe16+, Fe17+ cross-section measures (Hahn+, 2013) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1 I1 --- Order [2/7] Order 3- 4 A2 --- Seq Sequence 6- 12 A7 --- Ion Atom or Ion 14- 61 A48 --- Ref Reference (see refs.dat file) 63-135 A73 --- Comm Comment
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Z [2/30] nuclear charge 4- 5 I2 --- qi [0/28] initial charge state 7- 8 I2 --- qf [2/30] final charge state 10 I1 --- Eq [1/7] equation 12- 21 F10.4 eV Ith [17.9/24254] ionization threshold 23- 30 F8.5 --- f [0/15] f fitting parameter 32- 40 F9.5 --- p0 [0/400.2] p0 fitting parameter 42- 47 F6.3 --- p1 [0/30] p1 fitting parameter 49- 53 F5.3 --- p2 [0/2] p2 fitting parameter 55- 61 F7.3 --- p3 [-19.7/1] p3 fitting parameter 63- 68 F6.3 --- p4 [0/11.7] p4 fitting parameter
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Z [2/30] nuclear charge 4- 5 I2 --- qi [0/28] initial charge state 7- 8 I2 --- qf [2/30] final charge state 10- 19 F10.4 eV Eth [17.9/24254] energy threshold 21- 32 F12.9 --- a0 [-0.1/32] a0 fitting parameter 34- 46 F13.9 --- a1 [0/426] a1 fitting parameter 48- 62 F15.9 --- a2 [-3090.3/1.8] a2 fitting parameter 64- 78 F15.9 --- a3 [-7.3/11869.4] a3 fitting parameter 80- 94 F15.8 --- a4 [-23017.3/13] a4 fitting parameter 96-110 F15.9 --- a5 [-11.1/22040.7] a5 fitting parameter 112-126 F15.9 --- a6 [-8285/619.4] a6 fitting parameter 128-140 F13.8 --- a7 [-483.7/0.4] a7 fitting parameter 142-151 F10.8 --- err [0/0.2] maximum relative error of fit
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 48 A48 --- Ref Reference code (Author and year) 50- 68 A19 --- BibCode ADS bibcode of the reference if any 70-249 A180 --- Comm Comment
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 28-Jun-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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