J/A+A/599/A10 Radiative recombination electron energy loss data (Mao+, 2017)
The electron energy-loss rate due to radiative recombination.
Mao J., Kaastra J., Badnell N.R.
<Astron. Astrophys. 599, A10 (2017)>
=2017A&A...599A..10M 2017A&A...599A..10M (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: atomic data - atomic processes
Abstract:
For photoionized plasmas, electron energy loss rates due to radiative
recombination (RR) are required for thermal equilibrium calculations,
which assume a local balance between the energy gain and loss. While
many calculations of total and/or partial RR rates are available from
the literature, specific calculations of associated RR electron energy
loss rates are lacking.
Here we focus on electron energy loss rates due to radiative
recombination of H-like to Ne-like ions for all the elements up to and
including zinc (Z=30), over a wide temperature range.
We used the AUTOSTRUCTURE code to calculate the level-resolved
photoionization cross section and modify the ADASRR code so that we
can simultaneously obtain level-resolved RR rate coefficients and
associated RR electron energy loss rate coefficients. We compared the
total RR rates and electron energy loss rates of HI and HeI with those
found in the literature. Furthermore, we utilized and parameterized
the weighted electron energy loss factors (dimensionless) to
characterize total electron energy loss rates due to RR.
The RR electron energy loss data are archived according to the Atomic
Data and Analysis Structure (ADAS) data class adf48. The RR electron
energy loss data are also incorporated into the SPEX code for detailed
modeling of photoionized plamsas.
Description:
The weighted electron energy loss factors (dimensionless) are defined
by weighting the electron energy loss rate coefficients (per ion) with
respect to the total radiative recombination rates. Both the
unparameterized and parameterized weighted electron energy-loss
factors for H-like to Ne-like ions from H (z=1) up to and including
Zn (z=30), in a wide temperature range, are available here. For the
unparameterized data set, the temperatures are set to the conventional
ADAS temperature grid, i.e.
c2*(10,20,50,100,200,...,2*106,5*106,107)K, where c is the
ionic charge of the recombined ion. For the fitting parameters, the
temperature should be in units of eV. We refer to the recombined ion
when we speak of the radiative recombination of a certain ion, for
example, for a bare oxygen ion capturing a free electron via radiative
recombination to form H-like oxygen (O VIII, s=1, z=8). The fitting
accuracies are better than 4%.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
calc.dat 119 255 Unparameterized data
pars.dat 86 255 Fitting parameters
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Byte-by-byte Description of file: calc.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- s Isoelectronic sequence number
4- 5 I2 --- z Atomic number
7- 11 F5.3 --- f1 Weighted electron energy-loss factors at T1
13- 17 F5.3 --- f2 Weighted electron energy-loss factors at T2
19- 23 F5.3 --- f3 Weighted electron energy-loss factors at T3
25- 29 F5.3 --- f4 Weighted electron energy-loss factors at T4
31- 35 F5.3 --- f5 Weighted electron energy-loss factors at T5
37- 41 F5.3 --- f6 Weighted electron energy-loss factors at T6
43- 47 F5.3 --- f7 Weighted electron energy-loss factors at T7
49- 53 F5.3 --- f8 Weighted electron energy-loss factors at T8
55- 59 F5.3 --- f9 Weighted electron energy-loss factors at T9
61- 65 F5.3 --- f10 Weighted electron energy-loss factors at T10
67- 71 F5.3 --- f11 Weighted electron energy-loss factors at T11
73- 77 F5.3 --- f12 Weighted electron energy-loss factors at T12
79- 83 F5.3 --- f13 Weighted electron energy-loss factors at T13
85- 89 F5.3 --- f14 Weighted electron energy-loss factors at T14
91- 95 F5.3 --- f15 Weighted electron energy-loss factors at T15
97-101 F5.3 --- f16 Weighted electron energy-loss factors at T16
103-107 F5.3 --- f17 Weighted electron energy-loss factors at T17
109-113 F5.3 --- f18 Weighted electron energy-loss factors at T18
115-119 F5.3 --- f19 Weighted electron energy-loss factors at T19
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Byte-by-byte Description of file: pars.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- s Isoelectronic sequence number
4- 5 I2 --- z Atomic number
7- 16 E10.4 --- a0 Primary fitting parameter
18- 27 E10.4 --- b0 Primary fitting parameter
29- 38 E10.4 --- c0 Addiational fitting parameter
40- 49 E10.4 --- a1 Primary fitting parameter
51- 60 E10.4 --- b1 Primary fitting parameter
62- 71 E10.4 --- a2 Addiational fitting parameter
73- 82 E10.4 --- b2 Addiational fitting parameter
84- 86 F3.1 --- mdp Maximum deviation in percent
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Acknowledgements:
Junjie Mao, J.Mao(at)sron.nl
(End) Junjie Mao [SRON], Patricia Vannier [CDS] 09-Dec-2016