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Agadjanov Andria Agadjanov Dimitri Khelashvili Anzor Rusetsky Akaki 《The European Physical Journal A - Hadrons and Nuclei》2013,49(9):1-7
The European Physical Journal A - The divergent part of the one-loop effective action in Chiral Perturbation Theory with virtual photons has been evaluated in an arbitrary covariant gauge. The... 相似文献
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Todua NG Tretyakov KV Borisov RS Zhilyaev DI Zaikin VG Stein SE Mikaia AI 《Rapid communications in mass spectrometry : RCM》2011,25(6):750-754
Mono‐, di‐ and trialkyl derivatives of 'sulfabenzamide' (N‐4‐aminophenylsulfonylbenzamide) have been prepared and their electron ionization (EI) mass spectra examined. It is found that the fragmentation of N‐alkylsulfabenzamides (alkyl = CH3 to n‐C5H11) proceeds via a very specific rearrangement process. The proposed mechanism involves an intermediate formation of distonic molecular ions, and the driving force for this process is the formation of stable N‐alkylphenylcyanide cations [R‐N+ ? CC6H5]. The findings are confirmed by exact mass measurements, tandem mass spectrometry (MS/MS) experiments and deuterium labeling. Published in 2011 by John Wiley & Sons, Ltd. 相似文献
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Kirill V. Tretyakov Nino G. Todua Roman S. Borisov Vladimir G. Zaikin Stephen E. Stein Anzor I. Mikaia 《Rapid communications in mass spectrometry : RCM》2010,24(17):2529-2532
A new kind of ‘para‐effect’ under electron ionization (EI) conditions has been discovered for a series of bis(perfluoroacyl) derivatives of o‐, m‐ and p‐phenylenediamines, ‐hydroxybenzeneamines and ‐mercaptobenzeneamines of a common structure RCOX–C6H4–NHCOR (X = NH, S, O; R = CF3, C2F5, C3F7). Only the para‐isomers showed successive loss of a radical RCO? and a molecule RCN, leading to very intense peaks in the EI spectra. The composition and the origin of the [M–COR–NCR]+ ions were confirmed by exact mass measurements and linked scan experiments. The proposed mechanism of their formation takes into account likely para‐quinoid structures of the precursor ions. A similar rearrangement has not been observed for para‐isomers in the series of bis(perfluoroacyl) derivatives of benzenediols, mercaptophenols and dimercaptobenzenes. Published in 2010 by John Wiley & Sons, Ltd. 相似文献
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