J/A+A/587/A84 Parameterization of level-resolved RR data fro SPEX (Mao+, 2016)
Parameterization of level-resolved radiative recombination rate coefficients
for SPEX.
Mao J., Kaastra J.
<Astron. Astrophys. 587, A84 (2016)>
=2016A&A...587A..84M 2016A&A...587A..84M (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: atomic data - atomic processes
Abstract:
The level-resolved radiative recombination (RR) rate coefficients for
H-like to Na-like ions from H (Z=1) up to and including Zn (Z=30) are
studied here. For H-like ions, the quantum-mechanical exact
photoionization cross sections for nonrelativistic hydrogenic systems
are used to calculate the RR rate coefficients under the principle of
detailed balance, while for He-like to Na-like ions, the archival data
on ADAS are adopted. Parameterizations are made for the direct capture
rates in a wide temperature range. The fitting accuracies are better
than 5% for about 99% of the ∼3x104 levels considered here. The ∼1%
exceptions include levels from low-charged many-electron ions, and/or
high-shell (n≳4) levels are less important in terms of interpreting
X-ray emitting astrophysical plasmas. The RR data will be incorporated
into the high-resolution spectral analysis package SPEX.
Description:
The fitting parameters for the level-resolved radiative recombination
rate coefficients for H-like to Na-like ions from H (z=1) up to and
including (z=30), in a wide temperature range. The electron
temperature should be in units of eV. We refer to the recombined ion
when we speak of the radiative recombination of a certain ion, e.g.
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 5% for ∼99% of the levels considered here.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
rr_spex3.dat 129 39696 Fitting parameters
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Byte-by-byte Description of file: rr_spex3.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- 89 F6.2 --- csq Final chi-squared
91- 92 I2 --- dof Degrees of freedom
94- 98 F5.2 --- mdp Maximum deviation in percent
100-101 I2 --- n Principle quantum number, n
103-104 I2 --- sp Spin quantum number, 2S+1
106-107 I2 --- L Angular momentum quantum number, L
109-112 F4.1 --- J Total angular momentum quantum number J
114-129 A16 --- cfg Electron configuration
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Acknowledgements:
Junjie Mao, J.Mao(at)sron.nl
(End) Junjie Mao [SRON], Patricia Vannier [CDS] 08-Feb-2016