High vibrational state energy redistribution in two deuterated cyclopentenes

The high CH bond stretching vibrational states spectra (from Delta nu = 1 t o 6) are presented fur two isotopomers of cyclopentene: cyclopentene-1,2,3, 4,4,5,5-d(7) and cyclopentene-4,4,5,5-d(4), They are analyzed simultaneousl y with a model Hamiltonian expressed in internal curvilinear coordinates. B ecause of the size of the molecules, only the CH2 or CHD chromophore is con sidered in the calculations (two bond stretches and five angle deformations ). The results show a reasonable agreement between the experimental and cal culated spectra for the two molecules with the use of the same anharmonic p otential.