화학공학소재연구정보센터
Journal of Physical Chemistry A, Vol.109, No.45, 10239-10248, 2005
Photodissociation dynamics of the ethoxy radical investigated by photofragment coincidence imaging
The photodissociation dynamics of the ethoxy radical (CH3CH2O) have been studied at energies from 5.17 to 5.96 eV using photofragment coincidence imaging. The upper state of the electronic transition excited at these energies is assigned to the C-2 A"state on the basis of electronic structure calculations. Fragment mass distributions show two photodissociation channels, OH + C2H4 and CH3 + CH2O. The presence of an additional photodissociation channel, identified as D + C2D4O, is revealed in time-of-flight distributions from the, ratios and fragment translational energy distributions photodissociation of CD3CD2O. The product branching for all of the observed mass channels are nonstatistical. Moreover, the significant yield of OH + C2H4 product suggests that the mechanism for this channel involves isomerization on the excited-state surface. Photodissociation at a much lower yield is seen following excitation at 3.91 eV, corresponding to a vibronic band of the B-2 A' <- X-2 A" transition.