Hyperfine structure and isotopic shift of the n 2PJ levels (n = 7-10) of 203,205TI measured by Doppler-free two-photon spectroscopy

Abstract. Applying atomic beam laser spectroscopy, hyperfine constants as well as level isotope shifts of the (6s2r~s) 2S1/2 levels (n = 7 -12) and (6s2nd) 2D3/2,5/2 levels (n = 6-10) have been measured in 2°3T1 and 2°5T1. Furthermore, some new hyperfine constants and level isotope shifts of the T1 2p1/2, 3/2-states are presented together with corrected results of earlier experiments. The hyperfine splittings have been compared with the predictions of the semiempirical theory. For the D-states a relatively poor agreement between these theoretical predictions and experimental resuits has been found. Using the experimental level isotope shifts and the 6(r 2) value from muonic X-ray data, results of single-configuration Dirac-Fock calculations have been tested.

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A theoretical analysis of the collisional broadening and shift of Rydberg levels: with angular momenta J 1 taking into account the anisotropy of the Rydberg-perlurber potential is presented. The symmetry of the problem is used far the calculation of the collision S matrix in a semiclassical approximation with rectilinear trajenories. The obtained expressions for the broadening and shift cross sections allow an explanation of the observed differences between the broadening and shift of the anisotropic np, nd and IIP,,~ levels in comparison with those for the spherical ns and "PI,, states a L J "~v J v uu ll= 1-(25+1)-' Tr S (b) t Alexander van Humbaldt Foundation Research Fellow 1990/92.

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