J/A+AS/137/157 O III recombination coefficients (Kisielius+, 1999)
Recombination coefficients for the 5g-4f transitions of O III
at nebular temperatures and densities
Kisielius R., Storey P.J.
<Astron. Astrophys. Suppl. Ser. 137, 157 (1999)>
=1999A&AS..137..157K 1999A&AS..137..157K (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics ; Planetary nebulae
Keywords: atomic data - line: formation - ISM: H II regions -
ISM: planetary nebulae: general
Abstract:
We calculate effective recombination coefficients for the formation of
the 5g-4f lines of O III in the intermediate coupling scheme.
Photoionization data for the 5g levels calculated using the R-matrix
method are used to derive their recombination coefficients. Cascading
from higher states is included, allowing for the effects of finite
electron density in a hydrogenic approximation. We explicitly include
the distribution of population between the two ground levels of O3+
in the calculation of the line intensities. The results are presented
as a simple programmable formula allowing the calculation of
recombination line intensities for electron temperatures, Te in the
range 5000-20000K and electron densities, Ne in the range
102-106cm-3.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 64 24 Indices n1 and energy levels of the 4f and 5g
states in O2+ ions
table2.dat 41 83 Wavelengths in air, electric dipole transition
probabilities A(n1,n2) and branching ratios
b(n1,n2) for the 5g-4f transitions in O2+
ions
table3.dat 67 12 Fitting coefficients for the direct
recombination coefficients adir to the
5g levels of O2+
table4.dat 20 12 Fractions of the cascade contributions from
each series to the recombination coefficients
of the 5g levels of O2+
table5.dat 47 12 Calculated and fitted effective recombination
coefficients for the 5g levels of O2+ at the
electron temperatures T=10000K and T=20000K
and the electron density N=103cm-3.
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See also:
J/A+AS/133/257 : Recombination coefficients for NeII lines (Kisielius+ 1998)
J/A+AS/135/359 : HI and HeII fine structure components (Clegg+ 1999)
J/A+AS/142/85 : Recombination coefficients for C II lines (Davey+, 2000)
J/A+A/387/1135 : NII effective recombination coefficients (Kisielius+, 2002)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- n1 Level index
5- 6 A2 --- Term Term of parent level
8- 10 A3 --- J0 J of parent level
13- 14 A2 --- nl outer electron in spectroscopic notation
17 I1 --- S 2S+1 of level
19 A1 --- L L of level
21 I1 --- J J of level
25- 32 A8 --- LK Experimental level assignment
34 I1 --- Jb J of level
35- 44 F10.1 cm-1 Exp Experimental level energy (1)
45- 54 F10.1 cm-1 SS Theoretical level energy from SUPERSTRUCTURE
calculation
55- 64 F10.1 cm-1 RM Theoretical level energy from R-matrix
calculation
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Note (1): Experimental energy data are from Pettersson (Pettersson, Physica
Scripta, 1982, 26, 296) while theoretical values are from
SUPERSTRUCTURE (SS) and an R-matrix (RM) calculation. We also give
our theoretical (SS) and previous experimental (Moore, 1970,
"Atomic Energy Levels", NBS) level assignments.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- n1 Index of upper level (1)
5- 7 I3 --- n2 Index of lower level (1)
10- 18 F9.3 0.1nm Lambda Wavelengths (air)
21- 29 E9.2 s-1 A(n1,n2) Dipole transition probability between upper
and lower levels
32- 41 E10.3 --- b(n1,n2) Transition branching ratio
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Note (1): The indices n1 and n2 correspond to the energy level indices
in table 1.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- n1 Index of upper level
4- 11 F8.4 --- a1 Fitting coefficient a1
12- 19 F8.4 --- b1 Fitting coefficient b1
20- 27 F8.4 --- c1 Fitting coefficient c1
28- 35 F8.4 --- d1 Fitting coefficient d1
36- 43 F8.4 --- a2 Fitting coefficient a2
44- 51 F8.4 --- b2 Fitting coefficient b2
52- 59 F8.4 --- c2 Fitting coefficient c2
60- 67 F8.4 --- d2 Fitting coefficient d2
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- n1 Index of upper level (1)
3- 11 F9.5 --- g1c Fraction of cascade contribution from the
first series
12- 20 F9.5 --- g2c Fraction of cascade contribution from the
second series
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Note (1): Indices n1 correspond to the energy level indices from table 1.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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2- 3 I2 --- n1 Index of upper level (1)
6- 14 E9.3 10-12cm3/s acal1 T=10000K calculated recombination coefficient
17- 25 E9.3 10-12cm3/s afit1 T=10000K fitted recombination coefficient
28- 36 E9.3 10-12cm3/s acal2 T=20000K calculated recombination coefficient
39- 47 E9.3 10-12cm3/s afit2 T=20000K fitted recombination coefficient
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Note (1): Indices n1 correspond to the energy level indices from table 1.
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Acknowledgements: Romas Kisielius
(End) Patricia Bauer [CDS] 27-Apr-1999