title: Intensity ratios of (2)D(5/2,3/2)?(2)S doublets in the two-photon absorption spectrum of Rb and Cs.
abstract: Absorption ratios of doublets arising from n(2)D(5/2,3/2)? n'(2)S transitions in Rb (n = 5-9, n' = 5) and Cs (n = 7-13, n' = 6) were measured by Doppler-free two-photon spectroscopy using a thermionic ion detector. The observed ratios agree with calculated values for transitions to the higher levels but differ significantly for levels n = 5 in Rb and n =7, 8 in Cs. These experiments also provide new lower bounds for the ionization potentials of Rb(2) (3.62 eV) and Cs(2) (3.682 eV).
authors.forename: F
authors.initials: F
authors.lastname: Arqueros
authors.forename: P E
authors.initials: PE
authors.lastname: Larocque
authors.forename: M S
authors.initials: MS
authors.lastname: O'Sullivan
authors.forename: B P
authors.initials: BP
authors.lastname: Stoicheff