18
A. V. Glushkov
Table 2 The energy and width of the AS He 3s3p 1 P 0 (see text)
Method
Authors
E r (Ry)
G/2 (Ry)
REA
Glushkov et al.
−0.668802
0.006814
Complex-rotation
Ho
−0.671252
0.007024
Algebraic close coupling
Wakid-Callaway
−0.670
0.00695
Diagonalization method
Senashenko-Wague
−0.6685
0.00548
RHF
Nicolaides-Komninos
−0.671388
–
R-matrix calculation
Hayes-Scott
−0.6707
0.00660
Adiabatic potential curves
Koyoma et al.
−0.6758
–
Adiabatic potential curves
Sadeghpour
−0.67558
–
L 2 tech. + Sturmian func.
Gershacher-Broad
−0.67114
0.00704
Feshbach method
Wu-Xi
−0.669 27
0.00420
K-matrix L 2 basis-set
Moccia-Spizzo
−0.670 766
0.00676
Method
E r (eV)
G/2 (eV)
REA
69.9055
0.1854
Complex-rotation
69.8722
0.1911
Multicontigurational HF
69.8703
–
R-matrix calculation
69.8797
0.1796
Exp.- NBS-I (1973)
69.919 ± 0.007
0.132 ± 0.014
Exp.- Wisconsin (1982)
69.917 ± 0.012
0.178 ± 0.012
Exp.- SSRL (1987)
69.917 ± 0.012
0.178 ± 0.012
Exp.- BESSY (1988)
69.914 ± 0.015
0.200 ± 0.020
Exp.- DSRS (2009)
69.880 ± 0.022
0.180 ± 0.015
Note for the transfer of units of Ry-eV, the value of the energy of the He ground state E = −
5.80744875 Ry is used and Rydrberg reduced constant 1Ry = 13.603876 eV
3.2 Some Autoionization States in Spectrum of Barium
The barium atom is of considerable interest both from the point of view of atomic
spectroscopy and theoretical atomic physics, since it is essentially relativistic and
multielectron system, and it has an extremely complex and interesting spectrum of
both discrete and AS [4, 22, 23]. On the other hand, information about its spectroscopic parameters is important for further research using laser spectroscopy methods, and finally, an understanding of the physics and mechanisms of interatomic
interactions.
The study of the spectrum of this atom is of tremendous interest from the point
of view of the relevance of studying the shift and broadening of the transition
lines between low- and highly-excited speakers in the spectrum of barium in the
atmosphere of inert buffer gases (e.g. [4]). The 5d5g states are among the most
interesting and important barium AS, these resonances correspond to transitions
5d6p
3 F 4 -5d 5/2 5g [K = 9/2,7/2,5/2], 5d
2 3 F 3 -5d 5/2 5g − 5d
2 3 F 3 -5d 5/2 5g [22–24].
A. V. Glushkov
Table 2 The energy and width of the AS He 3s3p 1 P 0 (see text)
Method
Authors
E r (Ry)
G/2 (Ry)
REA
Glushkov et al.
−0.668802
0.006814
Complex-rotation
Ho
−0.671252
0.007024
Algebraic close coupling
Wakid-Callaway
−0.670
0.00695
Diagonalization method
Senashenko-Wague
−0.6685
0.00548
RHF
Nicolaides-Komninos
−0.671388
–
R-matrix calculation
Hayes-Scott
−0.6707
0.00660
Adiabatic potential curves
Koyoma et al.
−0.6758
–
Adiabatic potential curves
Sadeghpour
−0.67558
–
L 2 tech. + Sturmian func.
Gershacher-Broad
−0.67114
0.00704
Feshbach method
Wu-Xi
−0.669 27
0.00420
K-matrix L 2 basis-set
Moccia-Spizzo
−0.670 766
0.00676
Method
E r (eV)
G/2 (eV)
REA
69.9055
0.1854
Complex-rotation
69.8722
0.1911
Multicontigurational HF
69.8703
–
R-matrix calculation
69.8797
0.1796
Exp.- NBS-I (1973)
69.919 ± 0.007
0.132 ± 0.014
Exp.- Wisconsin (1982)
69.917 ± 0.012
0.178 ± 0.012
Exp.- SSRL (1987)
69.917 ± 0.012
0.178 ± 0.012
Exp.- BESSY (1988)
69.914 ± 0.015
0.200 ± 0.020
Exp.- DSRS (2009)
69.880 ± 0.022
0.180 ± 0.015
Note for the transfer of units of Ry-eV, the value of the energy of the He ground state E = −
5.80744875 Ry is used and Rydrberg reduced constant 1Ry = 13.603876 eV
3.2 Some Autoionization States in Spectrum of Barium
The barium atom is of considerable interest both from the point of view of atomic
spectroscopy and theoretical atomic physics, since it is essentially relativistic and
multielectron system, and it has an extremely complex and interesting spectrum of
both discrete and AS [4, 22, 23]. On the other hand, information about its spectroscopic parameters is important for further research using laser spectroscopy methods, and finally, an understanding of the physics and mechanisms of interatomic
interactions.
The study of the spectrum of this atom is of tremendous interest from the point
of view of the relevance of studying the shift and broadening of the transition
lines between low- and highly-excited speakers in the spectrum of barium in the
atmosphere of inert buffer gases (e.g. [4]). The 5d5g states are among the most
interesting and important barium AS, these resonances correspond to transitions
5d6p
3 F 4 -5d 5/2 5g [K = 9/2,7/2,5/2], 5d
2 3 F 3 -5d 5/2 5g − 5d
2 3 F 3 -5d 5/2 5g [22–24].