J/ApJS/170/251 Multiplet table for neutral helium (Drake+, 2007)
A multiplet table for neutral helium (4He I) with transition rates.
Drake G.W.F., Morton D.C.
<Astrophys. J. Suppl. Ser., 170, 251-260 (2007)>
=2007ApJS..170..251D 2007ApJS..170..251D
ADC_Keywords: Atomic physics ; Stars, atmospheres
Keywords: atomic data - ISM: atoms - stars: atmospheres
Abstract:
This paper combines the precise determination of the energy levels of
4HeI from calculations and experiments with theoretical transition
probabilities to present multiplet tables and finding lists for the
fine structure of the helium atom. The tabulated transition rates and
oscillator strengths include corrections for singlet-triplet mixing
and spin-orbit coupling, but not the higher order relativistic terms
nor the finite nuclear mass, although the latter are tabulated for
future use. The results are consistent with laboratory lifetimes and
oscillator strengths, but very few measurements are accurate enough to
be stringent tests. An Appendix discusses the corrections for finite
nuclear mass.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 105 295 The 4He Singlet - Singlet Transitions
table3.dat 105 261 *The 4He Triplet - Triplet Transitions
table4.dat 118 295 Multiplet Table for Singlet - Singlet Transitions
table5.dat 118 1587 Multiplet Table for Triplet - Triplet Transitions
table6.dat 118 289 Multiplet Table for Singlet - Triplet Transitions
table7.dat 118 327 Multiplet Table for Triplet - Singlet Transitions
table8.dat 59 110 Finding List for 4He Wavelengths<10000Å
table9.dat 59 827 Finding List for 4He Wavenumbers<10000cm-1
--------------------------------------------------------------------------------
Note on table3.dat: the original table contained 278 lines
(14 lines were repeated)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table[23].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- N Sequential multiplet number
5- 16 A12 --- Trans Level designations n 2S+1L (Lower-Upper)
18- 19 I2 --- gMl Lower level total statistical weight
21 A1 --- --- [-]
23- 24 I2 --- gMu Upper level total statistical weights
26- 36 F11.6 --- Wave Mean multiplet wavelength/wavenumber
38- 48 F11.6 --- Inf Mean multiplet nonrelativistic
wavelength/wavenumber (1)
50- 53 A4 --- x_Wave [A cm-1] Units for Wave and Inf (G1)
55- 65 F11.9 --- Rat Ratio of mean transition energies for true and
infinite nuclear mass
67- 72 F6.3 --- eta Coefficient of y in (1+ηy) (3)
74- 83 E10.4 ns tau Mean lifetime of term's upper levels (4)
85- 94 E10.4 --- fMlu Multiplet absorption oscillator strength for
infinite nuclear mass
96-105 E10.4 --- fMul Multiplet emission oscillator strength for
infinite nuclear mass (5)
--------------------------------------------------------------------------------
Note (1): For infinite nuclear mass corresponding to the energy used
in the calculation of A and f.
Note (3): Necessary to correct f to finite nuclear mass
as described in the appendix
Note (4): From equation 5 with σl Aul averaged over all u.
Note (5): fMul = gMl*fMlu/gMu.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table[4567].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- N Sequential multiplet number
5- 16 A12 --- Trans Level designations n 2S+1L (Lower-Upper)
18 I1 --- Jl ? Lower level J value (6)
19 A1 --- --- [-]
20 I1 --- Ju ? Upper level J value (6)
23- 32 F10.4 0.1nm AWave ? Air wavelength (1)
34- 45 F12.6 --- VWave Vacuum wavelength/wavenumber (2)
47- 50 A4 --- x_VWave [A cm-1] Units for VWave (G1)
52- 64 F13.6 cm-1 Elow Lower level energy from this paper
66- 78 F13.6 cm-1 Eup Upper level energy from this paper
80- 89 E10.4 s-1 Aul Spontaneous transition rate (4)
91-100 E10.4 s-1 SAul Sum of all Aul to lower levels (5)
102-111 E10.4 --- flu Absorption oscillator strength or f-value (4)
113-118 F6.4 --- Rat ? Ratio of flux to one from pure LS-coupled
states with no singlet-triplet mixing
--------------------------------------------------------------------------------
Note (1): For λ>2000Angstroms following
Peck & Reeder 1972, J. Opt. Soc. Am., 62, 958.
Note (2): Calculated from the energy levels of Paper I (Morton et al. 2006,
2006CaJPh..84...83M 2006CaJPh..84...83M) according to equation 1. If the vacuum wavelength
exceeds 10-4Å, the value is the more useful vacuum wavenumber as
indicated by the Units column. In table 5, the important 2 3S-2 3P
transition at 10833Å or 9231cm-1 is tabulated both ways
Note (4): Including singlet-triplet mixing and spin-orbit coupling.
Note (5): Which is the reciprocal of the lifetime of the upper level.
In table 5 and 6, the numbers are nearly identical for all three
J-values of each upper triplet term.
Note (6): Unspecified J values for mean values
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table8.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.3 0.1nm Wave Mean multiplet wavelength in vacuum
in Angstroms
10- 12 I3 --- N Sequential multiplet number
14- 25 A12 --- Trans Level designations n 2S+1L (Lower-Upper)
27 -28 I2 --- gMl Lower level total statistical weight
30 A1 --- --- [-]
31- 32 I2 --- gMu Upper level total statistical weights
34- 42 E9.3 s-1 AMul Multiplet spontaneous transition rate (1)
44- 52 E9.3 --- fMl Multiplet absorption oscillator strength
corresponding to AMul
54- 59 F6.3 --- log(gf) Log of the weighted multiplet absorption or
emission oscillator strength
--------------------------------------------------------------------------------
Note (1): Including singlet-triplet mixing and spin-orbit coupling.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table9.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.3 cm-1 Wave Mean wavenumber
10- 12 I3 --- N Sequential multiplet number
14- 25 A12 --- Trans Level designations n 2S+1L (Lower-Upper)
27 -28 I2 --- gMl Lower level total statistical weight
30 A1 --- --- [-]
31- 32 I2 --- gMu Upper level total statistical weights
34- 42 E9.3 s-1 AMul Multiplet spontaneous transition rate (1)
44- 52 E9.3 --- fMl Multiplet absorption oscillator strength
corresponding to AMul
54- 59 F6.3 --- log(gf) Log of the weighted multiplet absorption or
emission oscillator strength
--------------------------------------------------------------------------------
Note (1): Including singlet-triplet mixing and spin-orbit coupling.
--------------------------------------------------------------------------------
Global Notes:
Note (G1): Units used are written as follows:
A = Angstroms (0.1nm); wavelength in vacuum if λ<104Å.
cm-1 = Inverse cm; wavenumber if λ>104Å.
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 14-Apr-2009