On the Ionization Potential of the CH2 Radical

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Abstract
A marked difference has existed between the ionization potential of the methylene radical as measured by flash photolysis (10.396 eV) and by mass spectrometry (11.75 eV). A reinvestigation of the mass spectrometric experiment, undertaken to resolve the discrepancy, did not confirm the value previously reported. No evidence could be obtained for the formation of CH2+ from CH2 formed by pyrolysis of CH2N2, although the formation of CH3+ from CH3 formed by pyrolysis of (CH3)2 Hg could be readily detected.

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