Atomhyphen;Molecule ReactionDplus;H2rarr;HDplus;HStudied by Molecular Beams

摘要

Collisions between deuterium atoms and hydrogen molecules have been studied in a modulated crossed beam experiment. The relative signal intensity and the signal phase for product HD from reactive collisions allowed determination of both the angular distribution and HD mean velocity as a function of angle. From these a relative differential reactive scattering cross section in centerhyphen;ofhyphen;mass coordinates was deduced. The experiment indicates that reactively formed HD having little or no internal excitation, departs from the collision anistropically, with maximum amplitude 180deg; from the direction of the incident D beam in c.m. coordinates, which shows that theDsngbnd;Hsngbnd;Hreacting configuration is shorthyphen;lived compared to its rotation time. Nonreactive scattering of D by H2was used to assign absolute values to the differential reactive scattering cross sections.