Photofragment orientation as a probe of near-threshold non-adiabatic phenomena 
in the photodissociation of ICN

Black, J. F.; Hasselbrink, Eckart; Waldeck, J. R.; Zare, R. N.

doi:10.1080/00268979000102381

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Photofragment orientation as a probe of near-threshold non-adiabatic phenomena in the photodissociation of ICN

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Hasselbrink, Eckart
Department of Chemistry, Stanford University;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Black, J. F., Hasselbrink, E., Waldeck, J. R., & Zare, R. N. (1990). Photofragment orientation as a probe of near-threshold non-adiabatic phenomena in the photodissociation of ICN. Molecular Physics, 71(5), 1143-1153. doi:10.1080/00268979000102381.

Cite as: https://hdl.handle.net/21.11116/0000-0007-5F30-9

Abstract

Cyanogen iodide (ICN) is photodissociated at 249 nm. The CN(X ²Σ⁺, v = 2) fragments are probed by sub-Doppler laser-induced fluorescence (LIF) using circularly polarized light, which allows resolution of the F₁(J = N + ½) and F₂(J = N - ½) spin-rotation doublets. These components are shown to be oriented, i.e. to possess a non-statistical non-centrosymmetric M_J quantum-state distribution. The sign and magnitude of the orientation vary between components and are shown to have some correlation with the energetic threshold for production of the I(²P_1/2) spin-orbit state. These observations are briefly discussed in the context of breakdown of the Born-Oppenheimer approximation in this system.