Steric effects in chemiluminescent reactions of metastable Ca∗, Sr∗ atoms with isomeric propyl halides
作者:B. Pranszke、P. Kierzkowski、A. Kowalski
DOI:10.1016/s0009-2614(99)00676-4
日期:1999.8
Reactions of metastable alkalineearth atoms with normal and branched propyl halides were studied in a beam-gas arrangement. Chemiluminescence spectra of alkalineearthmonohalides were observed for calcium and strontium reactions. Some differences in the CaX () branching ratio were found with isomeric variation of the targets. Total collision cross-sections for Mg∗ and Ca∗ reactions are independent
Translational energy dependence of the reaction cross section: Reactions of Sr+CH<sub>3</sub>I, CD<sub>3</sub>I, and CH<sub>3</sub>Br
作者:Qi‐Xun Xu、R. Scott Mackay、F. Javier Aoiz、Richard B. Bernstein
DOI:10.1063/1.462090
日期:1992.2
The excitation functions for the crossed beam reactions of Sr+CH3I, CD3I, and CH3Br have been investigated over the collisional energy (ET) range 0.1 to ∼1.0 eV. A highly sensitive single photon ionization technique has been developed to detect the reaction products (SrI and SrBr). The integrated total reaction cross sections (σR) exhibit very different behavior in reactions with CH3I vs CH3Br. In the reaction of Sr+CH3I, σR decreases sharply with increasing ET to a minimum near 0.35±0.05 eV and then gradually increases with increasing ET. In the isotopically substituted reactant, CH3I, no difference in the excitation function is seen within the resolution of the experiment. However, for the reaction Sr+CH3Br, σR exhibits a threshold around 0.12±0.05 eV and gradually increases with increasing ET. The present data for the Sr reactions with CH3I and CH3Br are compared with analogous alkali metal reactions and with several theoretical models.