Mass spectrometry held desorption

To confirm the presence of gas molecules in the fullerene crystals we used thermal desorption mass spectrometry analysis. Before each measurement the sample was held for fixed periods of 3 h at temperatures 65, 150 and 270°C in enclosed quartz... 

Two new independently developed techniques called Dart ° (direct analysis in real time) and Desi (desorption electrospray ionisation) are making a huge impact on mass spectrometry. Together they remove the need for sample preparation and vacuum, speed up analysis time and can work in the open air. The sample is held in a gas or liquid stream at room temperature and the impact induces the surface desorption of ions. The ions then continue into the vacuum interface of the MS for analysis. Samples can be hard, soft or even liquid in nature. Ifa et al. have used Desi to image biological samples in two dimensions, recording images of tissue sections and the relative concentrations of molecules therein. Jeol have launched a commercial Dart ion source for non-contact analysis of materials in open air under ambient conditions. 

Beckey, H. D. (ed.) Principles of Held ionisation and field desorption mass spectrometry. Oxford Pergamon Press 1977... 

Kosevich, M.V. Shelkovsky, V.S. A New Type of GrajUte Emitter for Field lonization/Held Desorption Mass Spectrometry. Rapid Common. Mass Spectrom. 1993, 7, 805-811. 

Davis, S.C. Neumann, G.M. Derrick, P.J. Held Desorption Mass Spectrometry With Suppression of the High Field. Anal. Chem. 1987,59,1360-1362. 

Giessmann, U. RoUgen, F.W. Electrodynamic Effects in Held Desorption Mass Spectrometry. Int. J. Mass Spectrom. Ion Phys. 1981, 38,267-279. 

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