title: Electronic spectroscopy of the E<--X transition of NO-Kr and shielding/penetration effects in Rydberg states of NO-Rg complexes.
abstract: We report the results of a (2+1) resonance-enhanced multiphoton ionization (REMPI) study of the E2Sigma+(4ssigma) Rydberg state of NO-Kr. We present an assignment of the two-photon spectrum based on a simulation, and discuss it in the context of previously-reported spectra of NO-Ne and NO-Ar. In addition, we report on spectra in the region of the vNO=1 level of the E, F and H' 4s and 3d Rydberg states of NO-Rg (Rg=Ne-Kr). Since the NO vibrational frequency is affected by electron donation from the rare-gas (Rg) atom to the NO+ core, as well as by the penetration of the Rydberg electron, the fundamental NO-stretch frequency reflects the interactions in the complex. The results indicate that the 4s Rydberg state has a strong interaction between the NO+ core and the Kr atom, as was the case for NO-Ar and NO-Ne. For the 3d Rydberg states, although penetration is not as significant as for the 4s Rydberg states, it does play an important role, with subtle angular effects being notable.
authors.affiliation: Department of Physics and Astronomy, University of Georgia, Athens, GA 30602-2451, USA.
authors.forename: Bo
authors.initials: B
authors.lastname: Wen
authors.forename: Henning
authors.initials: H
authors.lastname: Meyer
authors.forename: Victoria L
authors.initials: VL
authors.lastname: Ayles
authors.forename: Adam
authors.initials: A
authors.lastname: Musgrave
authors.forename: Denis E
authors.initials: DE
authors.lastname: Bergeron
authors.forename: James A E
authors.initials: JA
authors.lastname: Silber
authors.forename: Timothy G
authors.initials: TG
authors.lastname: Wright