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Electron attachment lineshapes, cross sections and rate constants at ultra-low energies in several halomethyl and haloethyl molecules

1988; IOP Publishing; Volume: 21; Issue: 23 Linguagem: Inglês

10.1088/0953-4075/21/23/020

1361-6455

S H Alajajian, Mark T. Bernius, A. Chutjian,

Spectroscopy and Laser Applications

Electron attachment lineshapes, cross sections and rate constants are reported for the molecules CH2Br2, CF2Br2, CF3Br, CBrCl3, BrCN, C2H2Br4, CH3I, C2H5I and 1, 1, 1,-C2Cl3F3. Use is made of the krypton photoionisation method. In addition, the signal intercomparison technique is used to obtain individual channel cross sections and rate constants for Br- and CN-- formation from BrCN, and for Br- and Br2- formation from CF2Br2. Present results in 1,1,1,-C2Cl3F3 using a new ion extraction grid geometry are compared with earlier results, and differences discussed in terms of the electric field equipotentials of two extraction systems used in the present work. Approximate potential energy curves for BrCN are presented, and the temperature dependence of the Br- channel cross section discussed.