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.
Received 28 July 1999 and Received in final form 8 November 1999 相似文献