J/A+A/620/A188 Carbon atom electron-impact double ionization (Jonauka, 2018)
Electron-impact double ionization of the carbon atom.
Jonauka V.
<Astron. Astrophys. 620, A188 (2018)>
=2018A&A...620A.188J 2018A&A...620A.188J (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: atomic data - atomic processes
Abstract:
Electron-impact single- and double-ionization cross sections and
Maxwellian rate coefficients are presented for the carbon atom.
Scaling factors are introduced for the electron-impact excitation and
ionization cross sections obtained in the distorted wave (DW)
approximation. It is shown that the scaled DW cross sections provide
good agreement with measurements for the single ionization of the C
atom and C1+ ion. The direct double-ionization (DDI) process is
studied using a multi-step approach. Ionization-ionization,
excitation-ionization-ionization, and ionization-excitation-ionization
branches are analyzed. It is demonstrated that the three-step
processes contribute 40% of the total DDI cross sections for the case
where one of the electrons takes all of the excess energy after the
first ionization process.
Description:
Electron-impact DDI for the C atom is investigated using a multi-step
approach. Cross sections and Maxwellian rate coefficients for DI of
the C atom are presented. Study includes II, EII, and IEI branches of
the DDI process.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 46 36 Electron-impact ionization cross sections
for the ground level of carbon
table2.dat 46 37 Electron-impact ionization cross sections
for the 1D2 level of carbon
table3.dat 46 40 Electron-impact ionization cross sections
for the 1S0 level of carbon
table4.dat 46 33 Electron-impact ionization cross sections
for the ground level of the C1+ ion
table5.dat 46 24 Electron-impact double-ionization cross sections
for the ground level of the carbon atom when
one of the electrons takes all excess energy
table6.dat 46 38 Electron-impact double-ionization cross sections
for the ground level of the carbon atom when
the electrons share equally excess energy
table7.dat 46 17 Maxwellian rate coefficients for the
ground level of carbon
table8.dat 46 17 Maxwellian rate coefficients for the
1D2 level of carbon
table9.dat 46 18 Maxwellian rate coefficients for the
ground level of the C1+ ion
table10.dat 46 17 Maxwellian rate coefficients for the
ground level of the C1+ ion
table11.dat 46 16 Maxwellian rate coefficients for the
ground level of the carbon atom for the case
when one of the electrons takes all excess energy
table12.dat 46 16 Maxwellian rate coefficients for the
ground level of carbon atom when the electrons
share excess energy equally
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Byte-by-byte Description of file: table[123456].dat
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Bytes Format Units Label Explanations
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3- 6 I4 eV E Energy
9- 16 E8.4 10-20cm+2 CI:2s CI:2s cross section
19- 26 E8.4 10-20cm+2 CI:2p CI:2p cross section
29- 36 E8.4 10-20cm+2 EA Ea cross section
39- 46 E8.4 10-20cm+2 Total Total cross section
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Byte-by-byte Description of file: table[789].dat table1[012].dat
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Bytes Format Units Label Explanations
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3- 6 E4.1 K Te Temperature
9- 17 E9.4 10-10cm+3/s CI:2s CI:2s Maxwellian rate coefficient
19- 26 E8.4 10-10cm+3/s CI:2p CI:2p Maxwellian rate coefficient
29- 36 E8.4 10-10cm+3/s EA Ea Maxwellian rate coefficient
39- 46 E8.4 10-10cm+3/s Total Total Maxwellian rate coefficient
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Acknowledgements:
Valdas Jonauskas, valdas.jonauskas(at)tfai.vu.lt
(End) Patricia Vannier [CDS] 08-Nov-2018