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Cryogenic micro-calorimeters for mass spectrometric identification of neutral molecules and molecular fragments

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Novotny,  Oldrich
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
Columbia Astrophysics Laboratory, Columbia University;

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Krantz,  Claude
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Schwalm,  Dirk
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
Faculty of Physics, Weizmann Institute of Science;

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Wolf,  Andreas
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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1505.07222v2
(Preprint), 402KB

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Citation

Novotny, O., Allgeier, S., Enss, C., Fleischmann, A., Gamer, L., Hengstler, D., et al. (2015). Cryogenic micro-calorimeters for mass spectrometric identification of neutral molecules and molecular fragments. Journal of Applied Physics, 118(10): 104503. doi:10.1063/1.4930036.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0028-F5E1-0
Abstract
We have systematically investigated the energy resolution of a magnetic micro-calorimeter (MMC) for atomic and molecular projectiles at impact energies ranging from E≈13 to 150 keV. For atoms we obtained absolute energy resolutions down to ΔE≈120 eV and relative energy resolutions down to ΔE/E≈10−3. We also studied in detail the MMC energy-response function to molecular projectiles of up to mass 56 u. We have demonstrated the capability of identifying neutral fragmentation products of these molecules by calorimetric mass spectrometry. We have modeled the MMC energy-response function for molecular projectiles and conclude that backscattering is the dominant source of the energy spread at the impact energies investigated. We have successfully demonstrated the use of a detector absorber coating to suppress such spreads. We briefly outline the use of MMC detectors in experiments on gas-phase collision reactions with neutral products. Our findings are of general interest for mass spectrometric techniques, particularly for those desiring to make neutral-particle mass measurements.