Antunes R, Almeida D, Martins G, Mason NJ, Garcia G, Maneira MJP, Nunes Y, Limão-Vieira P. Negative ion formation in potassium-nitromethane collisions.
Phys Chem Chem Phys 2010;
12:12513-9. [PMID:
20721400 DOI:
10.1039/c004467a]
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Abstract
Ion-pair formation in gaseous nitromethane (CH(3)NO(2)) 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 NO(2)(-), O(-), CH(3)NO(2)(-), OH(-), CH(2)NO(2)(-) and CNO(-). By using nitromethane-d(3) (CD(3)NO(2)), 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 CH(2)NO(2)(-) may be explained in terms of dissociative electron attachment to highly vibrationally excited molecules.
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