There has been increasing evidence that certain isomeric glycans can be separated efficiently by ion mobility-mass spectrometry when deprotonated ions are analyzed. To better understand the fundamentals behind these separations, we here investigate the impact of ionisation mode and adduct formation using IM-MS, density-functional theory and ab initio molecular dynamics.

We present an ionisation model for Polycyclic Aromatic Hydrocarbon (PAH) molecules fromwhich we determine the various size dependant ionisation states expected in different space environments.Maps of ionisation regimes are derived. They allow the estimate of the ionisation fraction of PAH for any given set of parameters (electron density, flux factor and temperature) assuming a typical PAH size...

Context. Ionising stars reshape their original molecular cloud and impact star formation, leading to spectacular morphologies such as bipolar nebulae around H ii regions. Molecular clouds are structured in filaments where stars principally form, as revealed by the Herschel space observatory. The prominent southern hemisphere H ii region, RCW 36, is one of these bipolar nebulae. Aims. We study t...

In the present work we study the single ionisation of Helium by c6+ and 08+ ions at intermediate and high impact energies. Calculations of double differential, single differential and total cross sections with the Continuum Distorted Wave-Eikonal Initial State model are presented. These results are compared with the experimental and theoretical results available.