Site-dependent photodissociation of vibronically excited CD(3)NH(2) molecules.
The mechanism of H and D atom loss, following ultraviolet photolysis of methylamine-d(3), CD(3)NH(2), has been studied via electronic action and Doppler spectroscopies. The N-H bond is preferentially cleaved and the yield of both H and D photofragments increases gradually, but differently, as higher vibrational states on the first excited electronic state, A, are accessed, leading to some drop in H/D branching ratios. The average translational energies of the H photofragments are somewhat higher than those of D, implying lower energy content left in the internal degrees of freedom of the CD(3)NH than in the CD(2)NH(2) partner fragment. These results provide evidence for discrimination between the two channels and mechanistic insight into the N-H and C-D bond cleavage.
Marom
Ran
R
Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel.
Weiss
Tal
T
Rosenwaks
Salman
S
Bar
Ilana
I