Calculation of the Internal Energy Distribution of Product NH₂ from Ammonia Photodissociation Using Phase Space Theory

The internal energy distribution of product NH₂, which came from the 193nm ultraviolet photodissociation of Ammonia, was calculated using statistical phase space theory. The K-type rotational excitation of product NH₂ was specially emphasized, as well as the Renner-Teller electronic-rovibrational coupling effect. The calculation shown better agreements with the experimental results than other theoretical calculations such as prior theory and classical trajectory calculation. The results indicated that the NH₂ was internal highly excited and the photodissociation process was basically statistical though the dynamics bias should be considered.