Articles

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

Novotny, Oldrich; Allgeier, S.; Enss, C.; Fleischmann, A.; Gamer, L.; Hengstler, D.; Kempf, S.; Krantz, C.; Pabinger, A.; Pies, C.; Savin, Daniel Wolf; Schwalm, D.; Wolf, A.

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 concluded 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.

Files

  • thumnail for Novotny2015JAP118_104503.pdf Novotny2015JAP118_104503.pdf application/pdf 1.27 MB Download File

Also Published In

Title
Journal of Applied Physics
DOI
https://doi.org/10.1063/1.4930036

More About This Work

Academic Units
Astrophysics Laboratory
Published Here
September 6, 2017