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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
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
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
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 : 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 coll. strengths 1996A&AS..115..151S : IRON Project XI Ar VI, K VII & CaVIII 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 He II & Fe XXVI Electron excitation 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 2001A&A...365..258P : IRON Project XLVI Fe X electron excitation 2003A&A...401.1177C : IRON Project LII Ni24 electron excitation 2005A&A...436.1123M : IRON Project LVII Ni IV radiative transition rates 2005A&A...433..717S : IRON Project LVIII Fe XII electron impact excitation 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
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