Photodissociation of HN3 at 248 nm

Jingsong Zhang; Kesheng Xu; Gabriel Amaral

doi:10.1117/12.308411

15 May 1998 Photodissociation of HN₃ at 248 nm

Jingsong Zhang, Kesheng Xu, Gabriel Amaral

Proceedings Volume 3271, Laser Techniques for State-Selected and State-to-State Chemistry IV; (1998) https://doi.org/10.1117/12.308411
Event: Optoelectronics and High-Power Lasers and Applications, 1998, San Jose, CA, United States

Abstract

The hydrogen-atom product channel in the ultraviolet photodissociation of HN3, HN3( X 1A') + by —* H + N3(X 211), is investigated at a photolysis wavelength of 248 nm. The center-of-mass (CM) translational energy distribution of the H and N3( X 211) fragments is determined by the high-n Rydberg H-atom time-of-flight spectroscopy. The CM translational energy release peaks near the maximum available energy, with its average (Etrans) (J.7tEavaii. A strongly anisotropic product angular distribution was observed, with the anisotropy parameter 3 -0.8. The obtained information indicates a perpendicular electronic transition (A1A' f— X1A) of HN3 at 248 nm and a rapid dissociation via the repulsive excited-state surface. Bend and stretching vibration excitations of the photofragment N3 are observed. The upper limit of the bond energy D0(H-N3) is estimated to be 88.7 0.5 kcal mo11. Keywords: photodissociation, HN, H atom, N3.

Citation Download Citation

Jingsong Zhang, Kesheng Xu, and Gabriel Amaral "Photodissociation of HN₃ at 248 nm", Proc. SPIE 3271, Laser Techniques for State-Selected and State-to-State Chemistry IV, (15 May 1998); https://doi.org/10.1117/12.308411

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