Ring Puckering and CH Stretching Spectra. 3. High Vibrational States of Gaseous Monohydrogenated Cyclopentene-4-h1

The excited CH stretching vibrational states of gaseous cyclopentene (4-HC 5 D 7 ) have been measured from Δ v = 3 to Δ v = 6. Overtone spectra are modified by the large-amplitude ring-puckering motion and by a rapid energy flow to combination states. These two types of couplings with the CH stretching vibrations are explicitly modeled. The reconstruction of the spectra gives the predominant pathways of the intramolecular vibrational redistribution of the energy.