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Both single-laser and two-laser experiments were conducted to look into theion-imaging of Br*(2P1/2) and Br(2P3/2) photo-fragmented from1-bromo-2-methylbutane in the range 232-240 nm via a detection scheme of (2+1)resonance-enhanced multiphoton ionization. The angular analysis of thesephotofragment distributions yields the anisotropy parameter beta = 1.88 +/-0.06 for the Br* excited state which arises from a parallel transition, whilebeta = 0.63 +/- 0.09 for the Br ground state indicates the contribution fromboth a perpendicular transition and a non-adiabatic transition. When a hexapolecoupled with an orienting field was implemented, the parent molecules arespatially oriented to yield an orientation efficiency |<cos theta>| of 0.15.Besides the chi angle between the recoil velocity v and the transition dipolemoment mu, orienting molecules allows for the evaluation of the angle alphabetween v and the permanent molecular dipole moment d. The angular analysis ofBr* photofragment distribution yields chi to be 11.5 degrees and alpha in therange from 160 degrees to 180 degrees with weak dependency. In the two-laserexperiments, the angular anisotropy of Br photofragment distribution was foundto be smaller (0.38 +/- 0.10) when the photolysis wavelength was red-shifted to240 nm, suggesting the increasing contributions from perpendicular transitions.

Stereodynamics Imaging of Bromine Atomic Photofragments Eliminated from 1-Bromo-2-methylbutane Oriented via Hexapole State Selector