RYDBERG STATES OF DABCO.KRN CLUSTERS

The spectroscopy of DABCO.Kr(n) (1,4-diazabicyclo[2.2.2]octane) cluste rs was investigated using a two-color mass-selected ionization process . The transition from the ground state to the first excited state of D ABCO (which is already a Rydberg state) is one photon forbidden and wa s the object of our studies. In the mixed cluster, this transition bec omes allowed due to the reduced symmetry and its origin was detected i n DABCO.Kr(n) clusters for n - 1-3. Structural isomers of these cluste rs were identified and characterized by the spectral shifts of both th e S0 --> S1 and the S0 --> IP transitions using combination rules. The blue shifts which were observed for the S1 Rydberg state differ from previous reports of a red shift for a valence state undergoing the clu stering process.