Abstract
The collisional energy dependence of relative cross section for the Sr+CH 3I→SrI+CH 3 reaction has been measured in the range of 0.1 – 1.0 eV using the crossed molecular beam technique. An effusive Sr beam was crossed at a right angle with a pulsed CH 3I beam. The SrI product was detected in the scattering zone using time-of-flight mass spectrometry after laser single-photon ionization at 193 nm. The cross section (σ R) of this reaction decreases sharply with increasing E T until reaching a distinct minimum near 0.35 eV. After this minimum, the σ R gradually increases with increasing E T. In contrast to the K + CH 3I reaction (M.E. Gersh and R.B. Bernstein, J. Chem. Phys. 55 (1971) 4661; 56 (1972) 6131), no clear maximum is observed for this reaction. If such a maximum exists, it must occur below 0.1 eV.
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