Antunes, R.; Almeida, D.; Martins, G.; Mason, N. J.; Garcia, G.; Maneira, M. J. P.; Nunes, Y. and Limão-Vieira, P.
Negative ion formation in potassium–nitromethane collisions.
Physical Chemistry Chemical Physics, 12(39) pp. 12513–12519.
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Ion-pair formation in gaseous nitromethane (CH3NO2) induced by electron transfer has been studied by investigating the products of collisions between fast potassium atoms and nitromethane molecules using a crossed molecular-beam technique. The negative ions formed in such collisions were analysed using time-of-flight mass spectroscopy. The six most dominant product anions are NO2?, O?, CH3NO2?, OH?, CH2NO2? and CNO?. By using nitromethane-d3 (CD3NO2), we found that previous mass 17 amu assignment to O? delayed fragment, is in the present experiment may be unambiguously assigned to OH?. The formation of CH2NO2? may be explained in terms of dissociative electron attachment to highly vibrationally excited molecules.
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