Rydberg states in the condensed phase studied by fluorescence depletion spectroscopy
Institut de Physique de la Matière Condensée, Faculté des Sciences,
Université de Lausanne, 1015 Lausanne-Dorigny, Switzerland
Revised: 8 November 1999
Published online: 15 June 2000
Higher Rydberg states of NO trapped in rare gas matrices have been studied by inducing Rydberg-Rydberg transitions from the lowest Rydberg state and detecting its fluorescence depletion. This technique unravels Rydberg states, which cannot be accessed by ground state absorption. However, no clear cut Rydberg series show up. The data show a compression of the n-(n + 1) splittings between Rydberg states, as well as of the splittings. The results are rationalised in terms of the quantum defect model and the lack of extended Rydberg series is due to the compression of high-n Rydberg states in a tiny energy region below the ionisation potential. Finally, fluorescence depletion data of NO trapped in amorphous sites (the so-called red sites) of solid Ar can be interpreted in terms of the gas phase NO-Ar van der Waals data. A general discussion on the fate of Rydberg states in van der Waals complexes, in liquids, and in solids is presented in an attempt to relate the data in these different media.
PACS: 31.50.+w – Excited states / 31.70.Dk – Environmental and solvent effects / 71.35.Aa – Frenkel excitons and self-trapped excitons
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000