Abstract
Quite a few molecular species can only be generated in the gas phase because in solution or even in the solid state intermolecular interactions will make them unstable and lead to isomerization, polymerization or dissociation.1–3 The diluted gas phase which exists in a mass spectrometer is ideally suited for the study of isolated molecules. First of all, as the experiments are conducted in the absence of any counterions and solvents one does not have to account for any possible intermolecular effects. Secondly, the past ten years have witnessed an impressive development in mass spectrometric methodologies4–8 for the tailor-made generation and characterization of solitary ions with unusual structures and/or intriguing properties. Among the species studied are not only singly-charged ions, but also di- and polycations, which are produced from a high kinetic energy beam of mono-cations via charge-stripping mass spectrometry (CSMS),9–12 as well as unique neutrals.The latter can easily be generated and characterized by the promising technique of neutralization/reionization mass spectrometry (NRMS).13–18 Without going into technical details, the two experiments consist of the following steps:
CSMS: Monocations, m +1 , formed in the ion source of a multi-sector mass spectrometer, are accelerated to several keV kinetic energy and mass-selected by means of a magnetic field B before colliding with a collision gas, preferably oxygen, in a collision cell located in the field-free region between B and the electric sector E. Charge-stripping peaks due to reaction (1) are obtained by scanning the electric sector voltage (E) around E/2, where E represents the voltage required to transmit stable m +1 ions.
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Sülzle, D., Drewello, T., Schwarz, H. (1990). Beam Experiments as a Means for the Generation of Elusive Sulfur-Containing Molecules. In: Chatgilialoglu, C., Asmus, KD. (eds) Sulfur-Centered Reactive Intermediates in Chemistry and Biology. NATO ASI Series, vol 197. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-5874-9_16
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DOI: https://doi.org/10.1007/978-1-4684-5874-9_16
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