J/A+AS/136/395 IRON Project XXXVII. Fe VI collision strengths (Chen+ 1999)
Atomic data from the Iron Project. XXXVII. Electron impact excitation collision
strengths and rate coefficients for Fe VI
Chen G.X., Pradhan A.K.
<Astron. Astrophys. Suppl. Ser. 136, 395 (1999)>
=1999A&AS..136..395C 1999A&AS..136..395C (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: electron collision rates - fine structure transitions -
hot stellar sources: white dwarfs - H II regions: planetary nebulae
Abstract:
Collision strengths and Maxwellian-averaged rate coefficients have
been calculated for 3,160 non-vanishing transitions among 80 fine
structure levels, dominated by configurations 3d3, 3d24s, and
3d24p in Fe VI. Collision strengths are calculated using the
R-matrix method with a 34-term close-coupling target expansion and for
electron energies up to 10 Rydbergs. Detailed comparisons of rate
coefficients are presented with the relativistic Breit-Pauli
calculations using a 19-level expansion corresponding to the first
8 LS terms dominated by the ground configuration 3d3. For the
low-lying transitions of practical interest there is excellent
agreement, better than 10%, among three sets of rate coefficients
calculated using 34 term and 8-term non-relativistic calculations and
the 19-level Breit-Pauli calculation, indicating that (i) the
relativistic effects are not too significant, and (ii) the numerical
uncertainties associated with the resolution of the extensive
resonances in the collision strengths are small. Rate coefficients are
tabulated in a range of temperatures, 104-106K, where Fe VI is
normally abundant in radiatively photoionized or collisionally ionized
plasmas sources. The present rates for Fe VI are expected to find
applications in UV spectral diagnostics of hot stellar sources and
planetary nebulae.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
level4 35 80 Levels for table4
table4 80 8798 Maxwellian-averaged collision strengths
Upsilon(i,j) for the 3160 transitions between
the 140 levels at T=10000-1000000K in Fe VI
prog.f 74 36 Fortran code to read the data file table4
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Structure of file table4:
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Records Format Explanations
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1- 4 20A4 Title
5 3I5 Nuclear charge number Z (26), number of electrons
per ion N (21) and the number of levels (80)
6- 85 2I4,1X,F8.6,(A8) Level index, twice total angular momentum
2J, and the energy (configuration and term)
86 2I8 Number of transitions NTR (3160=80*79/2) and
number of temperatures NTEMP (21)
87- 481 7x,8(3x,i2,i3,1x) Transition keys ((i,j),i=1,j-1),j=2,ntr)),
with i and j being the initial and the
final levels.
482 F8.0 Temperature T = 2000 K
483- 877 8(1PE9.2) Upsilons for the corresponding transitions
specified in Record 87 - 481.
878-8797 F8/8((1PE9.2,1X) Repeating the above for 20 more temperatures:
10000, 20000, 30000, 40000, 50000, 60000,
70000, 80000, 90000, 100000, 150000, 200000,
250000, 300000, 400000, 500000, 600000, 700000,
800000, 900000, 1000000
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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/131/499 : IRON Project XXIX Boron isoelectronic sequence
J/A+AS/131/153 : IRON Project XXXI Fe XII electron excitation
J/A+AS/126/373 : IRON Project XXVII Fe IV collision strengths
J/A+AS/135/347 : IRON Project XXXV Fe XXIV & Fe XXV oscillator 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 probabiliti
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: level4
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Bytes Format Units Label Explanations
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1- 2 I2 --- Index Level index
5- 6 I2 --- 2J Twice total angular momentum
10- 17 F8.6 Ry E Experimental energy
23- 35 A13 --- Term configuration and electronic term
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History:
* 02-Apr-1999: first version
* 17-Jun-1999: table4 was updated (new version supplied by the author)
* 18-Jul-1999: table4 newly updated (a newer version supplied by the author)
Acknowledgements: Guo-xin Chen
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
(End) Patricia Bauer [CDS] 17-Jun-1999