<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Nakamura, M.</style></author><author><style face="normal" font="default" size="100%">Chang, H.-P.</style></author><author><style face="normal" font="default" size="100%">King-Chuen Lin</style></author><author><style face="normal" font="default" size="100%">Kasai, Toshio</style></author><author><style face="normal" font="default" size="100%">Che, Dock-Chil</style></author><author><style face="normal" font="default" size="100%">Palazzetti, Federico</style></author><author><style face="normal" font="default" size="100%">Aquilanti, Vincenzo</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Stereodynamic Imaging of Bromine Atomic Photofragments Eliminated from 1-Bromo-2-methylbutane Oriented via Hexapole State Selector</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Physical Chemistry A</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2019</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://www.scopus.com/record/display.uri?eid=2-s2.0-85068061488&amp;doi=10.1021%2facs.jpca.9b04048&amp;origin=inward&amp;txGid=5f2a0577b811d506098f1d89c91fd11f</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">123</style></volume><pages><style face="normal" font="default" size="100%">6799-6811</style></pages><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Both single-laser and two-laser experiments were conducted to look into the ion-imaging of Br*(2P1/2) and Br(2P3/2) photofragmented from 1-bromo-2-methylbutane in the range 232-240 nm via a detection scheme of (2+1) resonance-enhanced multiphoton ionization. The angular analysis of these photofragment distributions yields the anisotropy parameter β = 1.88 ± 0.06 for the Br∗ excited state which arises from a parallel transition, while β = 0.63 ± 0.09 for the Br ground state indicates the contribution from both a perpendicular transition and a non-adiabatic transition. When a hexapole coupled with an orienting field was implemented, the parent molecules are spatially oriented to yield an orientation efficiency |«cos θ »| of 0.15. Besides the χ angle between the recoil velocity v and the transition dipole moment μ, orienting molecules allows for the evaluation of the angle α between v and the permanent molecular dipole moment d. The angular analysis of Br∗ photofragment distribution yields χ = 11.5° and α in the range from 160° to 180° with weak dependency. In the two-laser experiments, the angular anisotropy of Br photofragment distribution was found to be smaller (0.38 ± 0.10) when the photolysis wavelength was red-shifted to 240 nm, suggesting the increasing contributions from perpendicular transitions. © 2019 American Chemical Society.&lt;/p&gt;
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