H. K. Carter

Collinear fast-beam laser spectroscopy experiment: Measurement of hyperfine structure and isotope shifts in Xe II

Abstract As an initial test of a new laser spectroscopy system placed on line to the UNISOR isotope separator, the hyperfine structure of 131 Xe II and 129 Xe II in their 5 d 4 D 7 2 and 6 p 4 P 5 2 levels has been investigated along with isotope shifts for 128–131, 134, 136 Xe relative to 132 Xe. The method utilizes the resonant absorption of laser light collinear to the beam of ∼50 keV Xe ions from the isotope separator. The spectra were produced by scanning a ring dye laser over a small frequency range and continuously monitoring the absorption through subsequent fluorescence of the 4 P 5 2 level. Laser and other electronic drifts during the course of the measurements were small and were monitored through simultaneous absorption of a portion of the laser light in an I 2 cell. The measured hyperfine constants and isotope shifts are compared with earlier results and δ 〈 r 2 〉 are deduced from the isotope shifts.