Photodissociation of N{sub 2}O: {ital J}-dependent anisotropy revealed in N{sub 2} photofragment images
- Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551 (United States)
Photofragment imaging is used to measure the state-specific angular distributions of N{sub 2} produced in the ultraviolet photodissociation of N{sub 2}O. 2+1 REMPI (resonance enhanced multiphoton ionization) through the a{sup {double_prime}}({sup 1}{Sigma}{sub g}{sup +}) state is used to ionize individual rotational states of N{sub 2}({nu}=0) between J=40 and J=90 produced when N{sub 2}O is dissociated by light of approximately 203 nm. The anisotropy parameter, {beta}, used to characterize the angular distributions of the N{sub 2} ion images, is greater than one for the lower rotational levels probed, and decreases to approximately zero for the highest rotational levels of N{sub 2}. The positive beta parameter indicates that the products arise primarily from a parallel transition to the 2&hthinsp;{sup 1}A{sup {prime}}({sup 1}{Delta}) state in the parent molecule, and the decrease in {beta} with increasing {ital J} of N{sub 2} is due to increased bending in the parent N{sub 2}O during dissociation. The ion images also allow us to assign transitions in a spectroscopically perturbed region of the N{sub 2} photofragment REMPI spectrum and to reveal the production of N{sub 2} products in the first vibrationally excited state. {copyright} {ital 1999 American Institute of Physics.}
- OSTI ID:
- 307244
- Journal Information:
- Journal of Chemical Physics, Vol. 110, Issue 7; Other Information: PBD: Feb 1999
- Country of Publication:
- United States
- Language:
- English
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