https://doi.org/10.1007/s100530050073
Rare-gas-induced broadening and shift of two-photon transitions to intermediate (n = 9-14) Rydberg states of atomic thallium *
I. Physikalisches Institut der Justus-Liebig-Universität
Giessen, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
Corresponding author: a Gerd.Hermann@exp1.physik.uni-giessen.de
Received:
6
August
1997
Accepted:
11
December
1997
Published online: 15 February 1998
Results of broadening and shift measurements of Doppler-free two-photon
lines for transitions from the ground state to the 
Rydberg
states with intermediate principle quantum numbers of atomic thallium
perturbed by rare gases are reported. The rates show a distinct behaviour in
this range of principle quantum numbers and significant dependence on the
total angular momentum of the upper nP state. The experimental results are
compared with calculations using a Van der Waals potential and a
superposition of polarization and Fermi potentials. Additionally, broadening
and shift rates of the transition Tl 6P3/2–9P3/2 have been
measured for quadrupolar as well as for mainly scalar excitation. The rates
for both kinds of excitation coincide within the limits of error reflecting
the small perturbation of the 6P3/2 state compared to that of the upper
9P3/2 state.
PACS: 32.70.-n – Intensities and shapes of atomic spectral lines / 31.50.+w – Excited states / 34.20.-b – Interatomic and intermolecular potentials and forces, potential energy surfaces for collisions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1998
