<?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%">Yang, S., Jr.</style></author><author><style face="normal" font="default" size="100%">Lin, K.-C.</style></author><author><style face="normal" font="default" size="100%">Kasai, T.</style></author><author><style face="normal" font="default" size="100%">Che, D.-C.</style></author><author><style face="normal" font="default" size="100%">Lombardi, A.</style></author><author><style face="normal" font="default" size="100%">Palazzetti, F.</style></author><author><style face="normal" font="default" size="100%">Aquilanti, V.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Stereodirectional images of molecules oriented by a variable-voltage hexapolar field: Fragmentation channels of 2-bromobutane electronically excited at two photolysis wavelengths</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Chemical Physics</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Angular distribution</style></keyword><keyword><style  face="normal" font="default" size="100%">Anisotropy parameters</style></keyword><keyword><style  face="normal" font="default" size="100%">Detector surfaces</style></keyword><keyword><style  face="normal" font="default" size="100%">Excitation wavelength</style></keyword><keyword><style  face="normal" font="default" size="100%">Excited states</style></keyword><keyword><style  face="normal" font="default" size="100%">Fragmentation channels</style></keyword><keyword><style  face="normal" font="default" size="100%">Linearly polarized lasers</style></keyword><keyword><style  face="normal" font="default" size="100%">Molecular beams</style></keyword><keyword><style  face="normal" font="default" size="100%">Molecular orientation</style></keyword><keyword><style  face="normal" font="default" size="100%">MOLECULES</style></keyword><keyword><style  face="normal" font="default" size="100%">Parallel transitions</style></keyword><keyword><style  face="normal" font="default" size="100%">Photolysis</style></keyword><keyword><style  face="normal" font="default" size="100%">Photolysis wavelength</style></keyword><keyword><style  face="normal" font="default" size="100%">Polarization</style></keyword><keyword><style  face="normal" font="default" size="100%">Velocity map ion imaging</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2017</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85018505764&amp;doi=10.1063%2f1.4981025&amp;partnerID=40&amp;md5=14c4f37f8e82f12ddbd3ff171159f8aa</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">1</style></number><volume><style face="normal" font="default" size="100%">147</style></volume><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;The asymmetric-top molecule 2-bromobutane is oriented by means of a hexapole state selector; the angular distribution of the bromine atom photofragment, for the two fine-structure components, is acquired by velocity-map ion imaging. The molecular beam, spatially oriented along the time-of-flight axis, is intersected with a linearly polarized laser, whose polarization is tilted by 45° with respect to the detector surface. To obtain the mixing ratio of the perpendicular and parallel transitions, the fragment ion images and angular distributions can be appropriately simulated to give insight on the population mechanism of the specific electronic state involved at each selected excitation wavelength. The photofragment images obtained at 238.6 nm yielded an asymmetry factor β1 of 0.67, indicative of the extent of molecular orientation, and an anisotropy parameter β2 of 1.03, which is a signature of a prevailing parallel transition along the C-Br axis. When the photolysis wavelength is tuned to 254.1 nm, the corresponding angular distribution is less asymmetric (β1 = 0.24) and the obtained small value β2 = 0.12 is a characteristic of a predominantly perpendicular transition. The photofragment angular distributions are also affected by hexapole voltage, especially regarding the asymmetry factor, and this aspect provides information on the effect of molecular orientation. © 2017 Author(s).&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;cited By 7&lt;/p&gt;
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