International Journal of Mass Spectrometry 328-329 (2012) iii-iv Contents lists available at ScienceDirect International Journal of Mass Spectrometry ELSEVIER journal homepage: www.elsevier.com/locate/ijms Contents Obituary 1-1 Detlef Schréder (1963-2012) Regular Articles 2-16 Binary encounter models for electron ionization of atoms: A one parameter expression for electron energy dependent (E < 200 eV) single ionization cross section B. Tsipinyuk, A. Bekkerman, E. Kolodney > A single parameter expression for the electron ionization cross section of atoms. ® Agreement with experiments is comparable with other multi-parameter expressions. ® Contribution of deep inner shells due to post-collision interactions is discussed. 17-22 Analysis of poly(ethylene glycol) using matrix-assisted laser = | desorption/ionization-mass spectrometry: Novel matrix systems using ultraviolet light absorber and stabilizer illlM N il li al \ Sung-Seen Choi, Hye-Seung Chung | aebti the, cHaeul i| nait ,} > PEG was analyzed using UV absorber in MALDI-MS. > Tinuvin 328 and Tinuvin 329 are good for the MALDI-MS analysis of PEG. ® By adding Tinuvin 770 to DHB, the ionization efficiency notably enhanced. Elsevier B.V. http://dx.doi.org/10.1016/S1387-3806( 12)00353-3 Contents 23-27 ESQC...,.MLG Atmospheric pressure photoionization study of post-translational modifications: The case of palmitoylation —— Aicha Bagag, Alexandre Giuliani, Matthieu Réfrégiers, Francois Le Naour Thermospray > Atmospheric pressure photoionization allows investigating palmitoylation. ® Synchrotron radiation provides optimal energy for photoionization. ® Photoionization provides in source zmentations yielding to a, b, ca nd y ions. ® APPI can be implemented with any existing mass Increasing the trapping mass range to m/z = 10°—A Sma Radius major step toward high resolution mass analysis of Quadrupole Einse! Lenses intact RNA, DNA and viruses Ejected Particle Xinyu Wang, Huijuan Chen, Jeonghoon Lee, Trajectory > Faraday Peter T.A. Reilly Detector Plate ampling and trapping of singly charged particulates is Trapping Point Antic npling and trapping was demonstrated up to m/z = 3 x10 Spatiai Filter > Trapping larger ions is possible. ® Trapping millions ed mass analysis in this range Evolution of isotropic and anisotropic spatial distribution of large ion clouds during the onset of quasi state equilibrium condition in a Paul trap Manoj Kumar Joshi, Pushpa M. Rao > We report experimental and theoretical work on spatial distri a tion of ior id Near; spherical, oblate and prolate ion cloud : yf the size of ion cloud is , f > In a non quasi stationary 43-66 Structural characterization and identification of five triterpenoid saponins isolated from Momordica cochinchinensis extracts by liquid chromatography/tandem mass spectrometry Zhi-Yan Lin, Xiaoyun Liu, Fan Yang, Yun-Qiu Yu ®» An LC-MSn method was used study the characterization of triterpenoid saponins terpenoid saponins was different in two ion modes was deduced by this method. ® A rapid ed of triterpen 67-77 An experimental study of organic matters that cause isobaric ions interference for boron isotopic measurement by thermal ionization mass spectrometry He-Pin Wu, Shao-Yong Jiang, Hai-Zhen Wei, Xiong Yan > isobari 1 inference in the TIMS boron isotope measurement. ® We verify with FTIR, Laser Raman and TG-MS. ® We confirm the existence and 1easurement. ® The isobaric ion inference comes from the n biocarbonates “4 fe4L)me eytsee e ese, aoe zi * s