Impact broadening of Sr 5sns 1 S 0, 5snd 1D2 and 5snd 3 D 2 levels by He and Xe

Abstract

The impact broadening of strontium 5sns 1So, 5snd ID 2 and 5snd 3D 2 levels by He and Xe have been studied by measuring the collisional half-widths of Doppler-free twophoton absorption lines from the 5s 2 aS 0 ground state in a thermionic diode. Large inelastic contributions to the broadening rates of the levels have been found where the moduli of the quantum defects of different level series are close to each other. A similar but continuous n-mixing behaviour along the series has also been found in our recent investigation on the broadening of Rb levels by noble gases. The broadening rates of the very high levels in Sr were found to be independent on the principal quantum number and the angular momentum of the levels and in good agreement with our recent broadening data of the Rb-He and Rb-Xe systems and the data for Na-He and Na-Xe found by the Columbia group.

Impact broadening of very high Rb Rydberg levels by Xe

“…The experimental set-up is the same as used recently in the experiment on the broadening of Sr levels by noble gases [2]. In contrary to our former studies of the Rb-noble gas systems [1] we worked with a thermionic heat-pipe diode instead of a glass diode.…”

Impact broadening of alkali Rydberg levels in pure and mixed alkali vapours

“…In recent papers [1][2][3] we have reported on the impact broadening and shift of spectral series by noble gases which have been measured applying the Doppler-free two-photon spectroscopy and the thermionic detection technique. Although there are still open questions the over-all behaviour of the noble gas broadening and shift seems to be well understood.…”