CD3 Deformation Modes as Preferential Promoters of Methylamine-d3 to the First Electronic State

Michael Epshtein, Alexander Portnov, Ilana Bar

Research output: Contribution to journalArticlepeer-review


The room-temperature photoacoustic Raman and jet-cooled H action spectra, measured in the region of the fundamental CD3 stretches and the almost isoenergetic overtones or combinations of CD3 deformations in the methylamine-d3 (CD3NH2) isotopologue, show different relative intensities of the vibrational bands. The observed difference and the vibrational assignment point to favored ultraviolet excitation due to larger Franck-Condon (FC) factors from the deformation modes, leading to more effective N-H bond cleavage in CD3NH2 predissociation. The comparable measured two-color reduced-Doppler ion images and total kinetic energy distributions resulting from the predissociation of molecules promoted from vibrationally excited and vibrationless ground states confirmed that the FC factors and not the ensuing dynamics are the main reason for the mode specificity in this molecule.

Original languageEnglish
Pages (from-to)3049-3054
Number of pages6
JournalJournal of Physical Chemistry A
Issue number19
StatePublished - 19 May 2016

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this