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J/A+AS/135/347 IRON Project XXXV. Fe XXIV and Fe XXV (Nahar+ 1999)
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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 (SIMBAD/NED BibCode)
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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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tarfe24.dat 27 13 *Fe XXIV target states and energies
tarfe25.dat 27 16 *Fe XXV target states and energies
elfe24.dat 34 83 Fe XXIV energy levels
elfe25.dat 34 138 Fe XXV energy levels
aij24.dat 64 802 Fe XXIV transition probabilities
aij25.dat 64 2579 Fe XXV transition probabilities
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Note on tarfe24.dat: Fe XXIV, Z = 26, number of target electrons = 2
Note on tarfe25.dat: Fe XXV, Z = 26, number of target electrons = 1
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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
NEW TABLES (12-Nov-1998)
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
NEW TABLES (12-Nov-1998)
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
Byte-by-byte Description of file: tarfe24.dat, tarfe25.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Index Level index
4- 7 A4 --- Conf Electronic configuration
9- 11 A3 --- Term Electronic term
13- 15 F3.1 --- J Total angular momentum
17- 27 E11.5 Ry E Theoretical energy
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Byte-by-byte Description of file: elfe24.dat, elfe25.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Index Level index
4- 18 A15 --- Level Level
20- 22 F3.1 --- J Total angular momentum
23 A1 --- Parity [oe] o: odd; e: even
26- 34 F9.4 Ry E Theoretical energy
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Byte-by-byte Description of file: aij24.dat, aij25.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Conf Configuration
19- 21 I3 --- Tf Total number of line for the configuration
23- 24 I2 --- i Initial level
26- 27 I2 --- k Final level
29- 30 I2 --- gi Lande factor (2I+1) of initial state
32- 33 I2 --- gk Lande factor (2J+1) of final state
35- 43 E9.3 s-1 Aki Transition probability
45- 54 E10.3 --- fik Oscillator strength
56- 64 E9.3 --- S Line strength (atomic units)
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Acknowledgements: Sultana Nahar <nahar@astronomy.ohio-state.edu>
References:
1993A&A...279..298H : IRON Project I. Goal and methods
1994A&AS..107...29S : IRON Project IV. Electron excitation of F-like ions
1995A&AS..110..209P : IRON Project IX. Electron excitation of Cl-like ion
1995A&AS..111..347G : IRON Project X. Si- & S-like ions IR collision strengths
1996A&AS..115..151S : IRON Project XI. Ar VI, K VII and Ca VIII fine-structure
1995A&AS..114..367B : IRON Project XII. V-like ions electron excitation
1996A&AS..115..551B : IRON Project XIII. Ni II & Fe II electron excitation
1996A&A...309..677S : IRON Project XIV. Fe XIV fine-structure transition
1996A&AS..118..157K : IRON Project XV. Electron excitation of He II & Fe XXVI
1996A&AS..119..105B : IRON Project XVI. Fe V oscillator strengths
1997A&AS..122..167B : IRON Project XX. Fe I oscillator strengths
1997A&AS..122..177P : IRON Project XXI. Fe I fine-structure transition
1997A&AS..126..105B : IRON Project XXIV. Fe XXIV electron excitation
1998A&AS..127..545B : IRON Project XXV. Fe XII electron excitation
1997A&AS..126..365B : IRON Project XXVI. Fe IV oscillator strengths
1998A&AS..129..161B : IRON Project XXVIII. F-like ions fine-structure trans.
1999A&AS..134..369S : IRON Project XXX. P III, S IV & Cl V collision data
1998A&AS..133..245G : IRON Project XXXII. Ar III effective collision strength
1999A&AS..135..159M : IRON Project XXXIII. Carbon radiative rates
1999A&AS..136..385E : IRON Project XXXIV. Fe XVI electron impact excitation
1999A&AS..137..175C : IRON Project XXXVI. Fe XXIII electron excitation
1999A&AS..137..529B : IRON Project XXXIX. Ni II oscillator strengths
2000A&AS..141..285S : IRON Project XL. Fe XIV electron excitation
2000A&AS..142..313B : IRON Project XLI. Fe VII electron excitation
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(End) Patricia Bauer [CDS] 22-Oct-1998