J/A+A/437/345 Fe IV radiative transition probabilities (Nahar+, 2005)
Atomic data from the Iron Project. LIX.
New radiative transition probabilities for Fe IV including fine structure.
Nahar S.N., Pradhan A.K.
<Astron. Astrophys. 437, 345 (2005)>
=2005A&A...437..345N 2005A&A...437..345N (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: atomic processes - line: formation - radiation mechanisms: thermal -
radiative transfer - ISM: HII regions - radio lines: galaxies
Abstract:
We present new calculations for transition probabilities of FeIV,
with much more extensive datasets than heretofore available, for a
variety of astrophysical applications. The large-scale close coupling
R-matrix calculations yield 1798 LS bound states with n≤11 and l≤9,
and corresponding 138121 dipole allowed transitions in the form of
oscillator strengths f, line strengths S, and A-coefficients. This
represents the largest R-matrix dataset in LS coupling for any ion
under either the Opacity Project or the Iron Project. Through
algebraic transformation of the LS multiplets, a total of 712120
dipole allowed fine structure transitions for FeIV are obtained.
Observed transition energies, whenever available, are used together
with the energy independent line strengths to derive the f- and the
A-values for improved accuracy; the adopted algorithm used calculated
energies for the remainder. Present results show significantly better
accuracy for the important low-lying states than previous
calculations. Monochromatic and mean opacities for FeIV are computed
and compared with those obtained using the Opacity Project data. We
find differences which could have important consequences for several
astrophysical applications involving low ionization stages of iron.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 42 1798 *Fe IV energy levels
enid-fe4.user 97 1827 Original file for table3.dat
table4.dat 79 138121 Fe IV Oscillator strengths for LS multiplets
fls-fe4.user 79 138145 Original file for table4.dat
fjj-fe4.user 80 1126519 Original file for table6
lifetime.f 79 173 Fortran code for fjj-fe4.user file
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Note on table3.dat: State with * represents incomplete fine structure set total.
nb of ls-terms= 1798.
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Description of file:
fjj.fe4.user (Fe IV Oscillator strengths for fine structure transitions)
1. The first line of each subset corresponds to the LS transition followed
by the fine structure components. The letter prefix designation of the
transitional states in the table corresponds to their energy positions,
as explained in Table 3. The energy unit for the individual states and
transition for the LS multiplets are in Rydberg. The energies are
absolute and negative signs are omitted for convenience. However, for
the fine structure transitions, the energies of the initial and final fine
structure levels are in unit of cm^-1, while the transitional energy
differences are in Å unit. The A-values are in s-1.
2. An asterisk (*) below an LS state indicates an incomplete set of
observed energy levels, and an asterisk for the transitional energy
indicates that one or both the levels are missing from the
observed energy set.
3. Observed energies are used for all transitions in LS multiplets whenever
available. An * between Ei and Ef values of the LS terms indicates
calculated energies are used
4. An * for the energies of the two transitional fs levels means that one of
the levels has not been observed. Hence the fs f- and a-values are obtained
from calculated energies.
5. An * below the arrow of a transition indicates that the calculated
transition was in reversed order.
6. An * on the left of a fine structure transition means that the low and the
high energy levels belong to the higher and lower LS terms respectively.
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Example:
TRANSITION Ei Ef EDIFF gi gf fif S aji
Ry/cm-1 Ry/cm-1 Ry/Å s-1
a6Se->z6Po 4.0200 2.2879 1.732E+00 6 18 4.226E-01 4.392E+00 3.395E+09
0.000 190226.00 525.69 6 8 1.880E-01 1.952E+00 3.403E+09
0.000 190008.00 526.29 6 6 1.408E-01 1.464E+00 3.391E+09
0.000 189885.00 526.63 6 4 9.381E-02 9.759E-01 3.384E+09
SJJ(sum)= 4.3916E+00
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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/135/347 : IRON Project XXXV Fe XXIV & Fe XXV oscillator strengths
J/A+AS/136/395 : IRON Project XXXVII Fe VI collision strengths
J/A+AS/137/165 : IRON Project XXXVIII Fe XV fine-structure transitions
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/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
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Config Configuration
19- 23 A5 --- SLpi SLpi term
30- 38 F9.6 Ry E Calculated absolute energy
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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- 3 I3 --- Si S parameter of the ith state of the
transitional symmetry (1)
5- 6 I2 --- Li L parameter of the ith state of the
transitional symmetry (1)
8 I1 --- Pi Parity parameter of the ith state of the
transitional symmetry (1)
10- 11 I2 --- i Energy position of the initial state (1)
15- 16 I2 --- Sf S parameter of the jth state of the
transitional symmetry (1)
18- 19 I2 --- Lf L parameter of the jth state of the
transitional symmetry (1)
21 I1 --- Pf Parity parameter of the jth state of the
transitional symmetry (1)
23- 24 I2 --- f Energy position of the final state (1)
27- 35 F9.6 Ry Ei Energy of the i state
38- 46 F9.6 Ry Ef Energy of the f state
49- 58 E10.4 --- fif f value
60 A1 --- n_S [I] I for Infinity
61- 70 E10.4 --- S ? Line strength (no value when S=Infinity)
71- 80 E10.4 s-1 Afi A-value
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Note (1): The first columns represent the transition, SiLiPi(i) -> SjLjPj(j),
that is, between ith and jth states of the transitional symmetries.
The integer designation for a state consists of the spin multiplicity
(2S+1), the total angular momentum L, such as 0 for L=S, 1 for L=P,
2 for L=D etc., the parity Pi, such as Pi= 0 for an even state and
Pi= 1 for an odd state, and the energy position of the state (the
fourth integer).
For example, 6 0 0 1 6 1 1 1 means 6S(1) -> 6P^o(1), where the
numbers within parenthesis are the energy position of the states,
the lowest ones in this case.
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Acknowledgements: Sultana Nahar, nahar.1(at)astronomy.ohio-state.edu
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...430..331C 2005A&A...430..331C : IRON Project LVI Fe XXIII electron excitation
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
(End) Patricia Vannier [CDS] 05-Apr-2005