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H. -C. Liu, S. Yang, I. Balteanu, O. P. Balaj, B. S. Fox-Beyer, M. K. Beyer, and V. E. Bondybey. Generation of C6H4+ by Laser Vaporization of Magnesium with o-C6H4F2 in Argon Carrier Gas. Rapid Commun. Mass Spectrom. , 18, pp. 1479-1481, 2004.

Abstract: A route to efficient generation of C6H, potentially the benzyne radical cation, is presented. Laser vaporization of Mg+. and supersonic expansion in helium doped with o-, m-, or p-C6H4F2 yields, among other ions, o-, m-, p-C6H4F2Mg+. complexes, but no C6H. Collision-induced dissociation experiments show that the o-C6H4F2Mg+. complex can be converted into C6H in a mildly energetic collision, with a center-of-mass energy around 1-2 eV. These conditions can also be reached in the ion source when argon is used as a carrier gas. In this way, mass spectra containing the desired m/z 76 peak, i.e. C6H, are obtained.

Keywords: benzyne radical cation, supersonic expansion, CID

Posted by Balaj O. Petru

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