J/A+A/599/A10Radiative 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 (SIMBAD/NED BibCode)ADC_Keywords: Atomic physicsKeywords: atomic data - atomic processesAbstract: 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. c^{2}*(10,20,50,100,200,...,2*10^{6},5*10^{6},10^{7})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:

FileName Lrecl Records Explanations

ReadMe 80 . This file calc.dat 119 255 Unparameterized data pars.dat 86 255 Fitting parameters

Byte-by-byte Description of file: calc.dat

Bytes Format Units Label Explanations

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

Byte-by-byte Description of file: pars.dat

Bytes Format Units Label Explanations

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

Acknowledgements: Junjie Mao, J.Mao(at)sron.nl(End)Junjie Mao [SRON], Patricia Vannier [CDS] 09-Dec-2016

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