Hyperfine structure in the sequence of sodium S states

Abstract

Abstract. The hyperfine structure for the 6. 7 and 8 'SI,* states of 23Na was measured by optical double-resonance techniques. The states were populated by step-wise excitation using two CW dye lasers. For the dipole interaction constant (i we obtain: a(6'S, 2 ) = 37.5(2) MHz, a(j2S, *) = 20.9(1) MHz, a(8'S,,,) = 12.85(10) MHz. Theoretical calculations of the hyperfine structure were performed for the 3-8 'SI states using many-body perturbation techniques. When polarization as well as certain correlation effects are included in the calculation. an agreement with the experimental values within 24;) is obtained.

Parity non-conservation in caesium

“…These effects may of course be included also in semiempirical orbitals, whereas other correlation effects are not so easily included In the related case of hyperfine structure of the s states of the alkali atoms [ 15, 43,44] and alkali-like systems [45,46] it has been found that this is, indeed the dominating part of the correlation effects and increases significantly the density at the nucleus for the valence electron compared to the HF value. For the 6s -7s transition in Cs, Dzuba et al [15] find a surprisingly small effect of this modification, a reduction of about 3 %.…”

Measurement of the hyperfine structure splitting for the 4 and 52 P 1/2 states of sodium using radio-frequency spectroscopy

“…For all the other alkali atoms the sequences of P-states have been more extensively examined [-4, 5]. Recently, highly excited S states of sodium were studied at this laboratory using if-resonance spectroscopy combined with step-wise laser excitations [6]. In the present paper we report on measurements of the hyperfine structure for the 4 and 5 2P~/2 states using a similar experimental arrangement.…”