Abstract
The dissociation mechanism of excited CH 2X 2 (X = Cl, Br) was investigated using charge-inversion mass spectrometry, in which positive ions collide with an alkali metal target to generate neutral fragments, and the negative ions formed from the neutral fragments are mass analyzed. Different relative abundances of the negative ions were observed in the charge-inversion spectra for CH 2Cl 2 and CH 2Br 2. The kinetic energy release values calculated from analysis of the peak associated with CH Cl 2 - in the charge-inversion mass spectrum of the parent CH 2 Cl 2 + ion indicate that the excited CH 2Cl 2 formed by neutralization dissociates spontaneously into CHCl 2 + H.
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