J/A+A/389/716 Oscillator strengths for Li-like ions (Nahar, 2002)
Relativistic fine structure oscillator strengths for Li-like ions:
CIV - Si XII, S XIV, Ar XVI, Ca XVIII, Ti XX, Cr XXII, and Ni XXVI
Nahar S.
<Astron. Astrophys. 389, 716 (2002)>
=2002A&A...389..716N 2002A&A...389..716N
ADC_Keywords: Atomic physics
Keywords: atomic data
Abstract:
Ab initio calculations including relativistic effects in the
Breit-Pauli R-matrix (BPRM) method are reported for fine structure
energy levels and oscillator strengths upto n=10 and 0≤l≤9 for 15
Li-like ions: C IV, N V, O VI, F VII, Ne VIII, Na IX, Mg X, Al XI, Si
XII, S XIV, Ar XVI, Ca XIII, Ti XX, Cr XXII, and Ni XXVI. About one
hundred bound fine structure energy levels of total angular momenta,
1/2≤J≤17/2 of even and odd parities, total orbital angular momentum,
0≤L≤9 and spin multiplicity (2S+1)=2, 4 are obtained for each
ion. The levels provide almost 900 allowed bound-bound transitions.
The BPRM method enables consideration of large set of transitions with
uniform accuracy compared to the best available theoretical methods.
The CC eigenfunction expansion for each ion includes the lowest 17
fine structure energy levels of the core configurations ls2, ls2s,
ls2p, ls3s, ls3p and ls3d. The calculated energies of the ions
agree with the measured values to within 1% for most levels. The
transition probabilities show good agreement with the best available
calculated values. The results provide the largest sets of energy
levels and transition rates for the ions and are expected to be useful
in the analysis of X-ray and EUV spectra from astrophysical sources.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
target.dat 44 255 The target levels in the eigenfunction expansion
of 15 ions.
table3a.dat 72 3088 Identified fine structure energy levels, ordered
in energy and grouped as LS terms
table3b.dat 76 1470 Calculated fine structure energy levels,
ordered in Jπ
table7.dat 84 27466 Oscillator strengths
en/* . 15 *Original energy files
fjj/* . 15 *Original oscillator strengths files
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Note on en/* and fjj/*: The names of the energy files are as "en.ion" and
oscillator strengths files are as "fjj.ion" where the ion is, for example,
c4 (carbon IV).
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Description of file: table3a.dat:
Nlv=Number of levels expected
Nlv(c)=Number of levels obtained
Nlv=Nlv(c) -> set complete
First lines:
Ion Configuration J E(Ry) EQN LS terms
Al XI Nlv= 1, 2Le: S ( 1 )/2
Al XI 1s2 (1Se) 0 2s 1/2 -3.24858E+01 1.93 2 S e
Al XI Nlv(c)= 1 : set complete
Al XI Nlv= 2, 2Lo: P ( 3 1 )/2
Al XI 1s2 (1Se) 0 2p 1/2 -3.08882E+01 1.98 2 P o
Al XI 1s2 (1Se) 0 2p 3/2 -3.08226E+01 1.98 2 P o
Al XI Nlv(c)= 2 : set complete
Description of file: fjj/fjj.*
First line:
The two numbers in the table are the nuclear charge (Z=13 for Al XI)
and the number of electrons (N_{elc} = 3) in the ion.
Below the above line, sets of transitions are given for pairs of
symmetries J*pi - J'*pi'.
For each set:
The first line - 2J, pi (parity =0 for even, =1 for odd), 2J' and pi',
the symmetries of transitions.
The second line - N_{J} and N_{J'}, the number of bound levels for
of the two symmetries.
This line is followed by N_{J} x N_{J'} number of transitions.
For each transition the first two columns are the level indices,
i and i' for the energies, If a gf-value is negative the lower
level is i (absorption) and if it is positive, the lower level
is i' (emission). The identification of the transition can be
determined from the levels of indices i and i' in Table 7.
Description of files: table7.dat
table7.dat regroups all data of fjj/* files
Firt lines :
Al XI 13 3
Al XI 1 0 1 1
Al XI 9 9 Ei(Ry) Ej(Ry) gfL S Aji(s-1)
Al XI 1 1 -3.24858E+01 -3.08881E+01 -7.414E-02 1.392E-01 7.600E+08
Al XI 1 2 -3.24858E+01 -1.36372E+01 -2.250E-01 3.581E-02 3.211E+11
Al XI 1 3 -3.24858E+01 -7.64533E+00 -5.578E-02 6.737E-03 1.382E+11
Al XI 1 4 -3.24858E+01 -4.88430E+00 -2.351E-02 2.555E-03 7.193E+10
Al XI 1 5 -3.24858E+01 -3.38732E+00 -1.234E-02 1.272E-03 4.195E+10
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Target levels: The target levels in the eigenfunction expansion:
Number of fine structure levels:
------------------
J pi Nlv(c)
------------------
1 0 9
1 1 9
3 0 8
3 1 9
5 0 8
5 1 7
7 0 6
7 1 7
9 0 6
9 1 5
11 0 4
11 1 5
13 0 4
13 1 3
15 0 2
15 1 3
17 0 2
17 1 1 (Not for C IV)
19 1 1 (Only for N V)
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Total number of levels = 98, except for C IV (97) and N V (99)
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See also:
J/A+A/340/300 : Fe II oscillator strengths (Raassen+ 1998)
J/A+A/365/266 : Fe XXIII oscillator strengths (Tully+, 2001)
J/A+AS/129/603 : High-nl Rydberg states in C II, C III and C IV (Quinet 1998)
J/A+AS/130/541 : Co II oscillator strengths (Raassen+ 1998)
J/A+AS/135/347 : IRON Project XXXV. Fe XXIV and Fe XXV (Nahar+ 1999)
J/ApJS/121/265 : Oscillator Strengths and Radiative Rates for FeXV (Deb+, 1999)
J/ApJS/121/591 : Oscillator Strengths for SIV (Coutinho+, 1999)
J/ApJS/124/527 : Oscillator strengths for lines in J+H bands (Melendez+, 1999)
J/PAZh/28/41 : Eu III oscillator strengths (Masonkina+, 2002)
J/A+AS/105/245 : Stark broadening Al XI and Si XII (Dimitrijevic+ 1994)
Byte-by-byte Description of file: target.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Ion Ion designation (1)
11- 12 I2 --- No Configuration number
14- 17 A4 --- Config Configuration
24- 26 A3 --- SLp Core level
30 I1 --- J Total angular momentum of the lower level
34- 44 E11.5 Ry E Energy
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Note (1): Ion designation: Al XI for target levels of Al XII in the
eigenfunction expansion of Al XI.
Al XI : Z = 13, No. of core electrons = 2, Target levels: 17
Ar XVI : Z = 18, No. of core electrons = 2, Target levels: 17
C IV : Z = 6, No. of core electrons = 2, Target levels: 17
Ca XVIII: Z = 20, No. of core electrons = 2, Target levels: 17
Cr XXII : Z = 24, No. of core electrons = 2, Target levels: 17
F VII : Z = 9, No. of core electrons = 2, Target levels: 17
Mg X : Z = 12, No. of core electrons = 2, Target levels: 17
N V : Z = 7, No. of core electrons = 2, Target levels: 17
Na IX : Z = 11, No. of core electrons = 2, Target levels: 17
Ne VIII : Z = 10, No. of core electrons = 2, Target levels: 17
Ni XXVI : Z = 28, No. of core electrons = 2, Target levels: 17
O VI : Z = 8, No. of core electrons = 2, Target levels: 17
S XIV : Z = 16, No. of core electrons = 2, Target levels: 17
Si XII : Z = 14, No. of core electrons = 2, Target levels: 17
Ti XX : Z = 22, No. of core electrons = 2, Target levels: 17
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Byte-by-byte Description of file: table3b.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Ion Ion designation (1)
10 I1 --- Nlv Number of levels
12- 17 A6 --- Jpi Spin symmetry level
19 I1 --- Level Level
21- 37 A17 --- T Target (config SLpi Jt) of the level
41- 43 A3 --- nl Principal and orbital quantum numbers of the
outer electron
46- 49 A4 --- J Total angular momentum of the lower level
52- 63 E12.11 Ry E Energy
65- 69 F5.2 --- EQN Effective Quantum Number
72- 76 A5 --- Terms Possible LS terms of the energy level
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Note (1): For each ion, Nlv(cal) = 98, except C IV (97) and N V (99)
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Global notes:
Al XI Z=13, Nelc=3
Ar XVI Z=18, Nelc=3
C IV Z= 6, Nelc=3
Ca XVIII Z=20, Nelc=3
Cr XXII Z=24, Nelc=3
F VII Z= 9, Nelc=3
Mg X Z=12, Nelc=3
N V Z= 7, Nelc=3
Na IX Z=11, Nelc=3
Ne VIII Z=10, Nelc=3
Ni XXVI Z=28, Nelc=3
O VI Z= 8, Nelc=3
S XIV Z=16, Nelc=3
Si XII Z=14, Nelc=3
Ti XX Z=22, Nelc=3
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Acknowledgements: Sultana Nahar
(End) Patricia Bauer [CDS] 13-May-2002