The photodissociation dynamics of Ã state ammonia molecules has been further investigated for deuterium-substituted derivatives NH2D, NHD2, and ND3 measuring the homogeneous line widths on action spectra. The line widths of the 201 vibronic band were determined to be 19, 12, and 1.3 cm-1 fwhm for NH2D, NHD2, and ND3, respectively. In consideration of our previously reported value of 26 cm-1 for NH3, the spectral line width decreases in proportion to the number of D atoms. This result shows that the dissociation rate in the Ã state is additive as for the number of H atoms, and it is explained by the fact that the zero-point energies on the potential surface of Ã state are equally shifted among deuterium-substituted ammonias.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry