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Universal Diffraction of Atomic and Molecular Matter‐Waves: A Comparison of He and D 2 Quantum Reflected from a Grating
Author(s) -
Zhang Weiqing,
Lee Ju Hyeon,
Kim Hye Ah,
Jin Byung Gwun,
Kim Bong Jun,
Kim Lee Yeong,
Zhao Bum Suk,
Schöllkopf Wieland
Publication year - 2016
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201600965
Subject(s) - diffraction , matter wave , grating , physics , quantum , materials science , optics , atomic physics , condensed matter physics , molecular physics , quantum mechanics
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 de Broglie 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.