MOLECULAR BEAM REACTIONS OF ORIENTED MOLECULES (TRIFLUOROMETHYL BROMIDE, POTASSIUM)
CARMAN, HOWARD SMITH, JR.
Doctor of Philosophy
A beam of oriented CF(,3)Br molecules is prepared by passing a randomly oriented beam through an appropriate series of inhomogeneous and homogeneous electric fields. An atomic K beam crosses the beam of oriented CF(,3)Br and the angular distribution of the reactively scattered KBr is measured with a differential surface ionization detector. The "heads" orientation (Br end closest to the incoming K) is about three-fold more reactive than the "tails" orientation. The KBr is scattered backwards in the "heads" orientation and forward in the "tails" orientation, qualitatively consistent with a "harpoon" type of mechanism in which the orientation affects either the electron jump or the breakup of the dissociating negative ion. A new apparatus has been constructed which uses a seeded supersonic nozzle source to produce the oriented molecular beam. The new source is characterized by measuring the velocity distributions of various seeded beams using the time-of-flight technique. The state-selecting properties of the inhomogeneous hexapole field are characterized by measuring the transmission of the field for seeded beams of CF(,3)Br, CF(,3)I, and CH(,3)Cl.