Molecular Beam Kinetics: Reactions of Deuterium Atoms with Halogen Molecules

Angular distributions and velocity distributions have been measured for deuterium halides reactively scattered from crossed beams of D atoms and five halogen molecules, Cl2, Br2, I2, ICl, and IBr. The D beam was obtained either from a tungsten furnace at ∼2800 ° K or a microwave discharge at ∼350 ° K, the halogen beam from a supersonic nozzle source at ∼300–350 ° K. A small computer was employed as a multiscalar to record the time of flight spectrum of the product at each observation angle. Data of satisfactory quality (signal‐to‐noise ratio > lim ∼ 8) were obtained with rather short counting times (> lim ∼ 1000 sec) for reactive scattering signals of a few counts per second. Contour maps of the differential reaction cross sections are derived from an approximate transformation to the center‐of‐mass coordinate system. The main results found with D atoms at ∼2800°K are as follows: (1) In the Cl2 reaction, most of the DCl recoils into the backward hemisphere with respect to the incoming D atoms; the angular...

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