Collinear fast beam-laser spectroscopy on 5d 2 D 3/2, 5/2 barium ions

Abstract

High resolution laser spectroscopy has been performed on mass-separated beams of barium ions, in a collinear geometry. Isotope shifts and hyperfine structures of the 5d2D3/2 ~6p2P3/2 transition and the 5d2Ds/2-*6p2P3/2 transition were measured. The results are interpreted in terms of core polarization effects.

Hyperfine structures and isotope shifts of the 5d 4 D 7/2?6p 4 P 5/2 0 transition in Xenon ions

“…4) shows the main features i.e., the slow decrease of (r e) with decreasing neutron nmnber, the odd-even staggering and the closed shell effect. A very similar behaviour has been reported earlier for the isotonic Ba and Cs nuclei [7][8][9][10][11][12][13].…”

“…3. Only pairs of isotopes, quoted in [7], have been used. The corresponding isotope shifts, includ- ._,0"@~ ing the error bars, from our data are deduced from Table 2.…”

“…The ion velocities were calculated using the calibration of the acceleration voltage described earlier [7]. Total shifts minus doppler shifts resulted in the isotope shifts, given in the second column of Table 2.…”

The early days of the Sculptor dwarf spheroidal galaxy

“…While for the odd-A isotopes the nucleon-electron spin interactions lead to hyper-fine splitting of the energy levels, the even isotopes are unaffected by HFS. The level splitting of Ba  reaches its maximum at ground state, and the components of the resonance line 4934 Å are separated by 78 mÅ (Brix & Kopfermann 1952;Becker & Werth 1983;Blatt & Werth 1982;Silverans et al 1980), and the Ba abundance derived from this line depends on the isotope mixture adopted in the calculations. Consequently, the barium abundances of ET0381 and scl_03_059 were determined from the Ba  subordinate lines Ba  5853, 6141, and 6497 Å, which are hardly affected by HFS (Table 2), while the Ba  4934 Å line was used to determine the Ba even-to-odd isotope abundance ratios, by requiring that all lines return the same abundance.…”