Abstract
The UV transition to the 3s Rydberg state in a number of saturated cyclic compounds has yielded a wealth of structural and energetic information. The HOMO → 3s spectra of pulsed molecular beam cooled samples can be conveniently investigated by 2 + 1 resonance-enhanced multiphoton ionization (REMPI) using pulsed laser light in the 360−420 nm region. The transition origins for a variety of methyl- and ethyl-substituted cyclohexanes, cyclohexanones, cyclopentanones, and tetrahyrdopyrans, as well as bicyclic compounds such as decalone and various camphors, are highly sensitive to the location of alkyl substitution as well as the orientation of the alkyl group (axial vs equatorial). In addition, the orientation of the ethyl rotor can be determined from the spectra. This technique is especially useful for investigating molecules in which several equilibrating conformations make the analysis of room-temperature spectra difficult. By rapid cooling in the molecular beam, higher energy conformers can be frozen out ...
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