scholarly journals Hyperfine structure and isotope shifts in Mo II

2016 ◽  
Vol 94 (11) ◽  
pp. 1195-1199 ◽  
Author(s):  
S.D. Rosner ◽  
R.A. Holt

We have applied fast-ion-beam laser-fluorescence spectroscopy to measure the hyperfine structures of seven even-parity and six odd-parity levels in Mo II and the isotope shifts of nine transitions in the wavelength range 424.5–443.4 nm. These are the first measurements of these parameters and almost the first such measurements in Mo II. These atomic data are essential for astrophysical studies of chemical abundances, allowing correction for saturation and the effects of blended lines. They also provide important constraints on stellar diffusion modeling, particularly in chemically peculiar (CP) stars, and serve as valuable input to semi-empirical theoretical models of hyperfine structure and isotope shifts.

2016 ◽  
Vol 94 (12) ◽  
pp. 1310-1313 ◽  
Author(s):  
Safa Bouazza

Until now experimental hyperfine structure (hfs) data of 12 even-parity Zr II levels were given in the literature. Recently new hyperfine splitting measurements of 11 other Zr II levels, of the same parity are achieved, applying fast-ion-beam laser-fluorescence spectroscopy. The hfs of these 23 gathered levels has been analysed by simultaneous parametrisation of the one- and two-body interactions, first in model space (4d + 5s)3 and secondly in extended space. For the three lowest configurations, radial parameters of the magnetic dipole A and quadrupole electric B factors are deduced in their entirety for 91Zr II, compared and discussed with calculated values, available in the literature, and also with ours, computed by means of the ab initio method. For instance we give the main experimental values of the extracted single-electron hfs parameters of 4d25s: [Formula: see text] = –2701 MHz, [Formula: see text] = –122.4 MHz, and [Formula: see text] = –113.5 MHz.


1995 ◽  
Vol 51 (4) ◽  
pp. 2838-2850 ◽  
Author(s):  
P. Villemoes ◽  
M. Wang ◽  
A. Arnesen ◽  
C. Weiler ◽  
A. Wännström

1977 ◽  
Vol 15 (6) ◽  
pp. 2293-2297 ◽  
Author(s):  
R. A. Holt ◽  
S. D. Rosner ◽  
T. D. Gaily

1997 ◽  
Vol 30 (15) ◽  
pp. 3355-3360 ◽  
Author(s):  
Ma Hongliang ◽  
Shi Wei ◽  
Yan Bin ◽  
Li Yong ◽  
Fang Dufei ◽  
...  

1999 ◽  
Vol 32 (5) ◽  
pp. 1345-1349 ◽  
Author(s):  
Ma Hongliang ◽  
Chen Miaohua ◽  
Chen Zhijun ◽  
Shi Wei ◽  
Lu Fuquan ◽  
...  

2005 ◽  
Vol 83 (8) ◽  
pp. 841-854 ◽  
Author(s):  
S D Rosner ◽  
D Masterman ◽  
T J Scholl ◽  
R A Holt

The high-resolution spectra of 110 transitions in Nd II over the range 418–465 nm were observed using the collinear fast-ion-beam/laser method (FIBLAS). The lower states of these transitions include the ground state and 10 metastable even-parity states with energies up to 5986 cm–1. The 64 odd-parity upper states have energies up to 29 434 cm–1. For each transition isotope shifts were measured for all the stable isotopes (mass numbers 142, 143, 144, 145, 146, 148, and 150), as well as hyperfine parameters for the two odd-mass-number isotopes. These quantities are important in modeling profiles of absorption lines in stellar atmospheres to obtain abundances, and in the classification of atomic energy levels. PACS Nos.: 31.30.Gs, 32.10.Fn, 95.30.Ky


1992 ◽  
Vol 46 (1) ◽  
pp. 45-51 ◽  
Author(s):  
P Villemoes ◽  
A Arnesen ◽  
F Heijkenskjöld ◽  
A Kastberg ◽  
M O Larsson

1998 ◽  
Vol 15 (3) ◽  
pp. 178-179 ◽  
Author(s):  
Hong-liang Ma ◽  
Wei Shi ◽  
Bing Yan ◽  
Miao-hua Chen ◽  
Zhi-jun Chen ◽  
...  

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