The velocity dependence of the relative cross section for the formation of Cs+ from Cs and Br2 has been measured in the c.m. energy range 1.5–16.5 eV. A crossed-molecular-beam technique was used. The threshold energy is 1.66 ± 0.1 eV (c.m.). This leads to a nominal value of 2.23 ± 0.1 eV for the electron affinity of Br2. A maximum cross section is found near 6 eV.
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Helbing et al. (1969) studied this question.
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