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Journal of Physics D Applied Physics

Collisions between Sr Rydberg atoms of intermediate and high principal quantum numbers and noble gases at thermal energies

K -D Heber, P. J. West, Eckart Matthias

Published Oct 14, 1988• 7 citations
Publisher

Abstract

Pressure shift and broadening measurements of 5snd 1 D 2 and 5snd 3 D 2 Rydberg states of Sr I due to Xe have been performed in the range 8<or=n<or=35 by means of Doppler-free two-photon excitation, combined with thermionic detection and the use of a molecular frequency standard. The data show striking differences between pressure shifts and broadenings of singlet and triplet states, which up to now have not been predicted by theory.

DOI
10.1088/0022-3727/21/10s/018

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Pressure shift and broadening measurements of 5snd 1 D 2 and 5snd 3 D 2 Rydberg states of Sr I due to Xe have been performed in the range 8<or=n<or=35 by means of Doppler-free two-photon excitation, combined with thermionic detection and the use of a molecular frequency standard. The data show striking differences between pressure shifts and broadenings of singlet and triplet states, which up to now have not been predicted by theory.
The behavior of alkaline atoms in Rydberg states in the presence of noble gases is a well-known topic.1 Knowledge of pressure shifts and broadening for very high principal quantum numbers is still incomplete, and extension of the data to n values as high as possible seems desirable. We investigated for the first time the shift and broadening of 5 s 21 S 0 → 5 s n d 1 D 2 transitions of 88SrI above n = 100. In those cases, where the Rydberg atoms interact with He, Ar, Kr, or Xe, the observed n dependence of the shift and broadening rates K∆ and Kγ is in agreement with theoretical predictions2 for intermediate n values (20 ≤ n ≤ 50). For high n, however, we cannot verify an asymptotic behavior.
Collisional broadening and shift data for even parity states of neutral barium are presented. A two-photon absorption technique is used to populate Rydberg states of n d 1 D 2 , 3 D 2 and 1 S 0 series. High-resolution Ba excitation spectra were measured using a diode detector while scanning the frequency of an excimer pumped dye laser. Inert gases Ar, Kr and Xe were used as perturbers at pressures ranging from 10 mb to 400 mb. Shifts and broadenings of spectral lines were measured as a function of pressure and principal quantum number n . Several perturbations and deviations from expected results are discussed in this paper.
Self-broadenings and frequency shifts of n2S{n}^{2}Sn2S and n2D{n}^{2}Dn2D Rydberg levels (up to $n\ensuremath{\sim}70$) have been measured for rubidium in the pressure range of 3 to 100 mTorr, and the general dependence on principal quantum number nnn has been established for this low-pressure regime. A closer examination has revealed large (almost evenly spaced) oscillations in the dependence of linewidth on principal quantum number for the 2S^{2}S2S levels in the region of largest linewidth ($n\ensuremath{\sim}20 \mathrm{to} 30$).
Broadening and shift rates for Rb 2S^{2}\mathrm{S}2S and 2D^{2}\mathrm{D}2D Rydberg states with principal quantum number n\ensuremath{\sim}10--50 have been measured for Ne, Kr, and H2{\mathrm{H}}_{2}H2​ perturbers, using the technique of Doppler-free two-photon spectroscopy. From the shift rates at high n, we derived electron scattering lengths of (0.24\ifmmode\pm\else\textpm\fi{}0.01)a0{a}_{0}a0​ for Ne, (-4.0\ifmmode\pm\else\textpm\fi{}0.3)a0{a}_{0}a0​ for Kr, and (1.64\ifmmode\pm\else\textpm\fi{}0.07)a0{a}_{0}a0​ for H2{\mathrm{H}}_{2}H2​. For Ne and Kr, these are in good agreement with other experimental values. Also, the n dependence of broadening and shift rates follows theoretical predictions for Ne and Kr, but not for H2{\mathrm{H}}_{2}H2​.