Journal
CHEMPHYSCHEM
Volume 17, Issue 22, Pages 3670-3676Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201600965
Keywords
atom optics; atom-surface interaction; emerging beam resonance; matter-wave diffraction; quantum reflection
Funding
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [NRF-2015R1A2A2A01005458, NRF-2012R1A1A1041789]
- Alexander von Humboldt Foundation
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Molecular beams of He and D-2 are scattered from a ruled diffraction grating in conical-mount geometry under grazing-incidence conditions. Fully resolved diffraction patterns as a function of detection angle are recorded for different grating azimuth angles and for two different kinetic energies of the particle beams. Variations in diffraction peak widths are traced back to different velocity spreads of He and D-2 determined by time-of-flight measurements. A comprehensive analysis of diffraction intensities confirms universal diffraction, that is, for identical deBroglie wavelengths, the relative diffraction intensities for He and D-2 are the same. Universal diffraction results from peculiarities of quantum reflection of the atoms and molecules from the diffraction grating. In quantum reflection particles scatter many nanometers in front of the surface from the long-range attractive branch of the particle-surface interaction potential without probing the potential well and the short-range repulsive branch of the potential.
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