J/A+AS/135/347 IRON Project XXXV. Fe XXIV and Fe XXV (Nahar+ 1999)
Atomic data from the Iron Project XXXV.
Relativistic fine structure oscillator strengths for Fe XXIV and Fe XXV
Nahar S N, Pradhan A.K.
<Astron. Astrophys. Suppl. Ser. 135, 347 (1999)>
=1999A&AS..135..347N 1999A&AS..135..347N
ADC_Keywords: Atomic physics
Keywords: atomic data - X-ray: galaxies
Abstract:
The first large-scale calculations of relativistic radiative
transition probabilities from the Iron Project is reported for dipole
allowed and intercombination (E1) transitions in Li-like Fe XXIV and
He-like Fe XXV. The ab intio calculations are carried out in the close
coupling approximation using the Breit-Pauli R-matrix method in
intermediate coupling characterized by SLJ, with total (2S+1)=2,4,
L=7, J=1/2-11/2 even and odd parity, for Fe XXIV, and with total
(2S+1)=1,3, L=9, and J=0-4 for Fe XXV. The eigenfunction expansions
for the target ions include 13 levels up to the n=3 for Fe XXV, and 16
levels up to the n=4 for Fe XXVI, respectively. The calculated number
of bound levels, 83 for Fe XXIV and 138 for Fe XXV, is much larger
than experimentally observed. The level energies are in good agreement
for the common levels. All dipole and intercombination fine structure
transitions involving the calculated bound levels up to n=10 and l=5
or 6 are considered. Oscillator strengths, line strengths, and
Einstein A-coefficients are tabulated for 802 transitions in Fe XXIV
and 2579 transitions in Fe XXV. The results compare well with limited
subsets of transitions considered in previous works including fully
relativistic and QED corrections. Additional comparisons between the
length and the velocity formulations indicate an overall accuracy
between 1-10%. The range of uncertainty is indicative of the
relatively small influence of atomic effects, such as the two-body
Breit interaction terms and finite nuclear mass term, that are not
included in the Breit-Pauli approximation employed in the present
calculations. The extensive set of data is expected to be useful in
the analysis of X-ray and XUV spectra from astrophysical sources.
Erratum:
A bug was detected and corrected in early 2007 in one of the stages
called RECUPD (Storey, Berrington, Werner 2007, private Iron Project
communications) of the Breit-Pauli R-matrix (BPRM) codes of the Iron
Project. It was related to the the phase factor of dipole matrix
elements of the Iron Project (Berrington et al., 1995, Comput. Phys.
Commun. 92, 290) and affected certain transition probabilities. The
calculations for ions have been repeated for corrected results in
order to replace the earlier results. (06-Aug-2009).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
fe25.en.fs.user 76 787 Original files fe25esf1,fe25esf2 and fe25esf3
fe25efs1.dat 37 16 Fe XXV ground and excited levels included in
the eigenfunction expansion of Fe XXIV
fe25efs2.txt 65 412 *Fine structure energy levels of Fe XXV, with
spectroscopic identification, ordered in
energy, and grouped as LS terms
fe25efs3.dat 60 196 Fine structure energy levels, with
spectroscopic identification, and ordered in
Jπ and energy
fe25.f.exp.user 80 232 Original files of table4 and table7b
table4.dat 79 196 Table of fine structure levels provided for
direct information on possible spectroscopic
transitions
table7b.dat 93 3333 Table of fine structure transitions
fe25.f.fs.user 79 3623 Original file of table6
table6.dat 81 120 Oscillator strengths f, S, A-values for allowed
E1 fine structure transitions with the
observed energy levels only
fe25.lifetime.user 79 220 Original file of lifetime
lifetime.dat 72 194 Lifetimes of fine structure levels
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Note on fe25efs2.txt:
Nlv=Number of levels expected
Nlv(c)=Number of levels obtained
Nlv=Nlv(c) -> set complete
For Equivalent electron levels:
(i) no EQN (effective qn)
(ii) no check of set completeness
First lines:
Configuration J E(Ry) EQN LS terms
Eqv electron/unidentified levels, parity: e
1s2 0 -6.49681E+02 1 S e
Nlv(c)= 1 : set complete
Nlv= 1, 3Le: S ( 1 )
1s (2Se) 1/2 2s 1 -1.61325E+02 1.97 3 S e
Nlv(c)= 1 : set complete
Nlv= 3, 3Lo: P ( 2 1 0 )
1s (2Se) 1/2 2p 0 -1.59352E+02 1.98 3 P o
1s (2Se) 1/2 2p 1 -1.59060E+02 1.98 3 P o
1s (2Se) 1/2 2p 2 -1.57883E+02 1.99 3 P o
Nlv(c)= 3 : set complete
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See also:
J/A+AS/103/273 : IRON Project II IR collision strengths of C-like ions
J/A+A/283/319 : IRON Project III B-like ions
J/A+AS/108/1 : IRON Project V Collision strengths of O-like ions
J/A+A/293/953 : IRON Project VI Fe II collision strengths
J/A+A/293/967 : IRON Project VII Fe II radiative transitions
J/A+AS/109/193 : IRON Project VIII Electron excitation of Ti-like ions
J/A+AS/119/509 : IRON Project XVII Radiative transition in Fe III
J/A+AS/119/523 : IRON Project XVIII Electron impact for Fe III
J/A+AS/120/361 : IRON Project XIX Fe II radiative transitions
J/A+AS/123/159 : IRON Project XXII C and O radiative rates
J/A+AS/123/575 : IRON Project XXIII Fe XXII excitation rate coefficients
J/A+AS/126/373 : IRON Project XXVII Fe IV collision strengths
J/A+AS/131/499 : IRON Project XXIX Boron isoelectronic sequence
J/A+AS/131/153 : IRON Project XXXI Fe XII electron excitation
J/A+AS/136/395 : IRON Project XXXVII Fe VI collision strengths
J/A+AS/137/165 : IRON Project XXXVIII Fe XV electron excitation
J/A+AS/143/483 : IRON Project XLII Fe XXI electron impact excitation
J/A+AS/144/141 : IRON Project XLIII Fe V transition probabilities
J/A+AS/147/111 : IRON Project XLIV Fe VI trans. prob. & line ratio
J/A+AS/147/253 : IRON Project XLV Ar XIII, Fe XXI trans. probabilities
J/A+A/365/268 : IRON Project XLVII Ni III electron impact excitation
J/A+A/372/1078 : IRON Project XLIX Fe XX electron impact excitation
J/A+A/372/1083 : IRON Project L Fe XIX electron impact excitation
J/A+A/394/753 : IRON Project LI Fe IX electron impact excitation
J/A+A/408/789 : IRON Project LIII Fe XVII transition probabilities
J/A+A/413/779 : IRON Project LIV Fe XX transition probabilities
J/A+A/420/763 : IRON Project LV Ni II electron impact excitation
J/A+A/437/345 : IRON Project LIX Fe IV transition probabilities
J/A+A/448/779 : IRON Project LXI Fe IV radiative transitions
J/A+A/457/721 : IRON Project LXII Fe XVIII allowed and forbidden trans.
J/A+A/466/763 : IRON Project LXIII Fe19+ electron impact excitation
J/A+A/389/716 : Oscillator strengths for Li-like ions (Nahar, 2002)
Byte-by-byte Description of file: fe25efs1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 3 I2 --- Level [1,16] Level number
5- 6 A2 --- Config Configuration
15- 17 A3 --- SLp SLp term
21- 23 A3 --- J J value
27- 37 E11.6 Ry E Energy
--------------------------------------------------------------------------------
Byte-by-byte Description of file: fe25efs3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Nlv Number of levels (1)
4- 5 I2 --- J [0,10] Total angular momentum
7 A1 --- P [oe] Parity
9- 10 I2 --- iiii [1,18] Level position
12- 23 A12 ---- T Target core of the level (config SLpi Jt)
25- 27 A3 --- nl Principal and orbital quantum numbers of the
outer electron
31- 32 I2 --- --- Total angular momentum, J
36- 47 E12.7 Ry E Energy
49- 53 F5.2 --- EQN ? Effective Quantum Number
56- 60 A5 --- Terms Possible Ls terms of the energy level
--------------------------------------------------------------------------------
Note (1): Number of fine structure levels:
-------------------------------
J pi Nlv(c)
-------------------------------
0 0 10
0 1 9
2 0 17
2 1 18
4 0 16
4 1 16
6 0 14
6 1 14
8 0 12
8 1 12
10 0 10
10 1 10
12 0 8
12 1 8
14 0 6
14 1 6
16 0 2
16 1 4
18 0 2
18 1 1
20 0 0
20 1 1
-------------------------------
Total number of levels = 196
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
3- 5 I3 --- i i level
7- 8 I2 --- J [0,10] Total angular momentum
9- 10 A2 --- --- [.0]
12 A1 --- P [oe] Parity
15- 17 I3 --- iiii Level position
22- 33 E12.7 Ry E Energy
36- 52 A17 --- Config Configuration
55- 61 A7 --- LS LS term (1)
73- 79 I7 --- jjpiiii Energy level ids (2)
--------------------------------------------------------------------------------
Note (1): There may be more than one possible LS term for some j-levels.
Simple assumption: higher L -> lower energy
Note (2): Energy levels with ids: jjpiiii, where
jj=2 x total angular momentum j, p=parity (e=0, o=1),
iiii=level position
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table7b.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- gi Initial level 2J+1 value
4 I1 --- Pi [0/1] Initial level parity
6- 7 I2 --- gf Final level 2J'+1 value
9 I1 --- Pf [0/1] Final level parity
11- 12 I2 --- Ni [1,18] Number of bound levels of symmetry i
14- 15 I2 --- Nf [1,18] Number of bound levels of symmetry j
17- 19 I3 --- NN NN=NixNj
21- 22 I2 --- i [1,18] Level of symmetry i
24- 25 I2 --- j [1,18] Level of symmetry j
27- 36 F10.2 0.1nm wl Wavelength
38- 48 E11.6 Ry Ei Initial energy
50- 60 E11.6 Ry Ef Final energy
62- 71 E10.5 --- fL Oscillator strength value (1)
74- 82 E9.4 --- S Line Strength (atomic units)
85- 93 E9.4 s-1 Aji Transition probability
--------------------------------------------------------------------------------
Note (1): If a f-value is negative. the lower level is i (absorption) and
if it is positive, the lower level is j (emission).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 9 A8 --- Ci Initial configuration (1)
14- 21 A8 --- Cj Final configuration
26- 28 A3 --- SiLiPi Initial core level
30- 32 A3 --- SjLjPj Final core level
34- 35 I2 --- gi Initial Lande factor (2J+1) value
37- 38 I2 --- Ii ? Energy level index of Ji
(no value when Ci = LS)
40- 41 I2 --- gf Final Lande factor (2J+1) value
43- 44 I2 ---- If ? Energy level index of Jf
(no value when Ci = LS)
46- 54 F9.2 --- Eij(A) ? Eij value
56- 63 E8.3 --- f Oscillator strength
65- 72 E8.3 --- S Line strength (atomic units)
74- 81 E8.2 s-1 A Transition probability
--------------------------------------------------------------------------------
Note (1): nz = 26 , No. of core electrons= 1, No of transitions = 104
--------------------------------------------------------------------------------
Byte-by-byte Description of file: lifetime.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 4 I3 --- Level Level number
6- 33 A28 --- Conf Configuration
34 I1 --- J Total angular momentum
35- 36 A2 --- --- [.0]
39- 40 I2 --- Ij [1,18] Final level
42- 52 E11.6 Ry E Energy
55- 63 E9.4 s Lifetime ? Lifetime
64 A1 --- n_Lifetime [i] i for infinity
70- 72 I3 --- NTrans Number of transitions
--------------------------------------------------------------------------------
Acknowledgements: Sultana Nahar
References:
1993A&A...279..298H 1993A&A...279..298H : IRON Project I Goal and methods
1994A&AS..107...29S 1994A&AS..107...29S : IRON Project IV Electron excitation of F-like ions
1995A&AS..110..209P 1995A&AS..110..209P : IRON Project IX Electron excitation of Cl-like ion
1995A&AS..111..347G 1995A&AS..111..347G : IRON Project X Si- & S-like ions IR coll. strengths
1996A&AS..115..151S 1996A&AS..115..151S : IRON Project XI Ar VI, K VII & CaVIII fine-structure
1995A&AS..114..367B 1995A&AS..114..367B : IRON Project XII V-like ions electron excitation
1996A&AS..115..551B 1996A&AS..115..551B : IRON Project XIII Ni II & Fe II electron excitation
1996A&A...309..677S 1996A&A...309..677S : IRON Project XIV Fe XIV fine-structure transition
1996A&AS..118..157K 1996A&AS..118..157K : IRON Project XV He II & Fe XXVI Electron excitation
1996A&AS..119..105B 1996A&AS..119..105B : IRON Project XVI Fe V oscillator strengths
1997A&AS..122..167B 1997A&AS..122..167B : IRON Project XX Fe I oscillator strengths
1997A&AS..122..177P 1997A&AS..122..177P : IRON Project XXI Fe I fine-structure transition
1997A&AS..126..105B 1997A&AS..126..105B : IRON Project XXIV Fe XXIV electron excitation
1998A&AS..127..545B 1998A&AS..127..545B : IRON Project XXV Fe XII electron excitation
1997A&AS..126..365B 1997A&AS..126..365B : IRON Project XXVI Fe IV oscillator strengths
1998A&AS..129..161B 1998A&AS..129..161B : IRON Project XXVIII F-like ions fine-structure trans.
1999A&AS..134..369S 1999A&AS..134..369S : IRON Project XXX P III, S IV & Cl V collision data
1998A&AS..133..245G 1998A&AS..133..245G : IRON Project XXXII Ar III effective collision strength
1999A&AS..135..159M 1999A&AS..135..159M : IRON Project XXXIII Carbon radiative rates
1999A&AS..136..385E 1999A&AS..136..385E : IRON Project XXXIV Fe XVI electron impact excitation
1999A&AS..137..175C 1999A&AS..137..175C : IRON Project XXXVI Fe XXIII electron excitation
1999A&AS..137..529B 1999A&AS..137..529B : IRON Project XXXIX Ni II oscillator strengths
2000A&AS..141..285S 2000A&AS..141..285S : IRON Project XL Fe XIV electron excitation
2000A&AS..142..313B 2000A&AS..142..313B : IRON Project XLI Fe VII electron excitation
2001A&A...365..258P 2001A&A...365..258P : IRON Project XLVI Fe X electron excitation
2003A&A...401.1177C 2003A&A...401.1177C : IRON Project LII Ni24 electron excitation
2005A&A...436.1123M 2005A&A...436.1123M : IRON Project LVII Ni IV radiative transition rates
2005A&A...433..717S 2005A&A...433..717S : IRON Project LVIII Fe XII electron impact excitation
2006A&A...446..361W 2006A&A...446..361W : IRON Project LX Fe17+ electron impact excitation
History:
* 26-Feb-1999: First version
* 06-Aug-2009: All files corrected (from author)
(End) Patricia Vannier [CDS] 06-Aug-2009