Peptide fragmentation induced by radicals at atmospheric pressure

A novel ion dissociation technique, which is capable of providing an efficient fragmentation of peptides at essential atmospheric pressure conditions, is developed. The fragmentation patterns observed often contain c‐type fragments that are specific to electron capture dissociation/electron transfer dissociation (ECD/ETD), along with the y‐/b‐type fragments that are specific to collision‐activated dissociation (CAD). In the presented experimental setup, ion fragmentation takes place within a flow reactor located in the atmospheric pressure region between the ion source and the mass spectrometer. According to a proposed mechanism, the fragmentation results from the interaction of ESI‐generated analyte ions with the gas‐phase radical species produced by a corona discharge source. Copyright © 2008 John Wiley & Sons, Ltd.     

Victor P. Spiridonov (1931–2001)

Structural Chemistry -     

Application of focusing arrays to the problems of acoustic brightness thermometry

Theoretical and experimental studies on the localization of heated objects by the methods of acoustic brightness thermometry are carried out. It is demonstrated that, in the case of using a single focusing array, the spatial localization of heated objects depends on the size of the source. One-and two-dimensional tomography of a real heated source is performed by an acoustic thermal tomograph with a focusing array. The results agree well with the data calculated according to the suggested model. The applicability of correlation focusing acoustic brightness thermometry to the localization of a heated source is investigated both theoretically and experimentally. It is demonstrated that a considerable increase in the spatial resolution of the method leads to a significant loss in sensitivity.     

An electron diffration study of the molecules of triethyl and trivinyl phosphites in the vapor phase

Journal of Structural Chemistry -