J/A+A/466/771 Ionization rate coefficients for elements H to Zn (Dere+, 2007)
Ionization rate coefficients for the elements hydrogen through zinc.
Dere K.P.
<Astron. Astrophys. 466, 771 (2007)>
=2007A&A...466..771D 2007A&A...466..771D
ADC_Keywords: Atomic physics
Keywords: atomic data - atomic processes - plasmas
Abstract:
The interpretation of astrophysical spectra depends directly on a
knowledge of the ionization state of the emitting plasma. This is
determined, in part, from collisional ionization rate coefficients.
The most recent assessments of these were performed by Arnaud &
Rothenflug (1985A&AS...60..425A 1985A&AS...60..425A) and Arnaud & Raymond
(1992ApJ...398..394A 1992ApJ...398..394A). Since their work, new laboratory measurements
of ionization cross sections have become available as well as the
Flexible Atomic Code (FAC) which enables theoretical calculations of
these rates. Our goal is to provide a complete set of ionization rate
coefficients for the elements hydrogen through zinc.
Description:
This table contains spline fits to scaled ionization rate coefficient
that will allow the computation of ionization rate coefficients of all
ions of the elements hydrogen through zinc over a wide range of
temperatures.
This file has been modified from the original to correct the values for
the calcium-like sequence on September 12, 2007.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table29.dat 329 465 Spline fits, multiplied by a factor of 106,
to the scaled ionization rate coefficients
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Byte-by-byte Description of file: table29.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Z [1/30] Nuclear charge
4- 5 I2 --- Ion [1/30] Ion (spectroscopic notation)
7- 8 I2 --- Nspl [15/20] Number of splines
10- 18 F9.3 eV I Ionization potential
20- 28 E9.4 K Tmin Minimum temperature
30- 35 F6.4 --- x1 Scaled temperature 1 (1)
37- 42 F6.4 --- x2 Scaled temperature 2 (1)
44- 49 F6.4 --- x3 Scaled temperature 3 (1)
51- 56 F6.4 --- x4 Scaled temperature 4 (1)
58- 63 F6.4 --- x5 Scaled temperature 5 (1)
65- 70 F6.4 --- x6 Scaled temperature 6 (1)
72- 77 F6.4 --- x7 Scaled temperature 7 (1)
79- 84 F6.4 --- x8 Scaled temperature 8 (1)
86- 91 F6.4 --- x9 Scaled temperature 9 (1)
93- 98 F6.4 --- x10 Scaled temperature 10 (1)
100-105 F6.4 --- x11 Scaled temperature 11 (1)
107-112 F6.4 --- x12 Scaled temperature 12 (1)
114-119 F6.4 --- x13 Scaled temperature 13 (1)
121-126 F6.4 --- x14 Scaled temperature 14 (1)
128-133 F6.4 --- x15 Scaled temperature 15 (1)
135-140 F6.4 --- x16 ? Scaled temperature 16 (1)
142-147 F6.4 --- x17 ? Scaled temperature 17 (1)
149-154 F6.4 --- x18 ? Scaled temperature 18 (1)
156-161 F6.4 --- x19 ? Scaled temperature 19 (1)
163-168 F6.4 --- x20 ? Scaled temperature 20 (1)
170-177 F8.4 10-6 rho1 ?=* Scaled rate coefficient 1 (2)
179-185 F7.4 10-6 rho2 Scaled rate coefficient 2 (2)
187-193 F7.4 10-6 rho3 Scaled rate coefficient 3 (2)
195-201 F7.4 10-6 rho4 Scaled rate coefficient 4 (2)
203-209 F7.4 10-6 rho5 Scaled rate coefficient 5 (2)
211-217 F7.4 10-6 rho6 Scaled rate coefficient 6 (2)
219-225 F7.4 10-6 rho7 Scaled rate coefficient 7 (2)
227-233 F7.4 10-6 rho8 Scaled rate coefficient 8 (2)
235-241 F7.4 10-6 rho9 Scaled rate coefficient 9 (2)
243-249 F7.4 10-6 rho10 Scaled rate coefficient 10 (2)
251-257 F7.4 10-6 rho11 Scaled rate coefficient 11 (2)
259-265 F7.4 10-6 rho12 Scaled rate coefficient 12 (2)
267-273 F7.4 10-6 rho13 Scaled rate coefficient 13 (2)
275-281 F7.4 10-6 rho14 Scaled rate coefficient 14 (2)
283-289 F7.4 10-6 rho15 Scaled rate coefficient 15 (2)
291-297 F7.4 10-6 rho16 ? Scaled rate coefficient 16 (2)
299-305 F7.4 10-6 rho17 ? Scaled rate coefficient 17 (2)
307-313 F7.4 10-6 rho18 ? Scaled rate coefficient 18 (2)
315-321 F7.4 10-6 rho19 ? Scaled rate coefficient 19 (2)
323-329 F7.4 10-6 rho20 ? Scaled rate coefficient 20 (2)
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Note (1): the scaled temperature x is given by Eq.(4):
x = 1 - log(f)/flog(t+f) where
t = kT/I (k = Boltzmann's constant = 8.617x10-5eV/K), and f = 2.
The actual temperature is therefore given by:
T = (I/k)[exp(log.f/(1-x))-f]
Note (2): the scaled rate coefficient ρ is defined by Eq.(5):
ρ = t1/2.I3/2.R(T)/E1(1/t)
where t = kT/I (k = Boltzmann's constant = 8.617x10-5eV/K),
R(T) is the ionization rate coefficient at temperature T,
and E1 is the first exponential integral.
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History:
* 15-Feb-2007: Original version (table29.v00)
* 14-Sep-2007: table corrected (from author)
Acknowledgements: Ken Dere, kdere(at)gmu.edu
(End) Ken Dere [George Mason University], Patricia Vannier [CDS] 14-Sep-2007