Berlin 2001 – scientific programme

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A: Atomphysik

A 17: Posters Friday (Spectroscopy)

A 17.42: Poster

Friday, April 6, 2001, 12:30–15:00, AT3

The Effect of the Nuclear Charge Distribution on the Osmium Hyperfyne Structure Parameters — •Andrei Loginov¹ and Ilia Tupitsin² — ¹Vavilov State Optical Institute, 199034, St.Petersburg,Russia, e-mail: loginov@soi.spb.su — ²St.Petersburg State University, 198904, St.Petersburg, Russia

High resolution measurements of the magnetic dipole hyperfine interaction constants A were carried out recently for two osmium isotopes ¹⁸⁷Os and ¹⁸⁹Os and the hfs anomaly of the 5d⁷6s levels was estimated[1]. Here we suggest the method of theoretical explanation of these results taking into account the nuclear electric charge distribution over the nuclear volume. The basic idea is rather simple. We suggest to calculate the configuration mixing contribution to the hfs parameters taking into account mixing with the configuration caused by the excitation of the inner ns-electrons. Keeping in mind osmium spectrum 5d⁷6s levels investigated in [1] it means to take into account the following configuration mixing: ns²5d⁷6s+ns5d⁷6s²+ns5d⁷6sn′s. As the ns-electron wave functions are sensitive to the nuclear charge contribution mostly we hope that this configuration mixing contributions are different for different isotopes. The question is whether this difference is sufficient to explain the experimental results [1] as concerning the hfs anomaly. According to the present report it is not sufficient. Although the configuration mixing contribution to the hfs parameters a_nl proved to be very significant. [1] Go. Basar, H.-O. Behrens, G.-H. Guthohrlein. 31st EGAS Abtracts, 1999, p.171.