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Zhao, Bum Suk
Atom and Molecule Optics Lab (AMOL)
Research Interests
  • Standing wave, quantum state, optical force, grazing inceidence, atom optics, matter wave

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Enhanced elastic scattering of He-2 and He-3 from solids by multiple-edge diffraction

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Title
Enhanced elastic scattering of He-2 and He-3 from solids by multiple-edge diffraction
Author
Kim, Lee YeongPark, SanghwanLee, Chang YoungSchollkopf, WielandZhao, Bum Suk
Issue Date
2022-08
Publisher
ROYAL SOC CHEMISTRY
Citation
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Abstract
We report on a method of enhanced elastic and coherent reflection of He-4(2) and He-4(3) from a micro-structured solid surface under grazing incidence conditions. The van der Waals bound ground-state helium clusters exhibit fundamental quantum effects: He-4(2), characterized by a single ro-vibrational bound state of 10(-7) eV dissociation energy, is known to be a quantum halo state; and He-4(3) is the only electronic ground-state triatomic system possessing an Efimov state in addition to the ro-vibrational ground state. Classical methods to select and manipulate these clusters by interaction with a solid surface fail due to their exceedingly fragile bonds. Quantum reflection under grazing incidence conditions was demonstrated as a viable tool for elastic scattering from a solid surface but suffers from small reflection probabilities for typical conditions. Here we demonstrate that multiple-edge diffraction enables enhanced elastic scattering of the clusters from a solid. A dual-period reflection grating, where the strips consist of micro-structured edge arrays, shows an up to ten fold increased reflection probability as compared to its conventional counterpart where the strips are plane patches enabling quantum reflection of the clusters. The observed diffraction patterns of the clusters provide evidence of the coherent and elastic nature of scattering by multiple-edge diffraction.
URI
https://scholarworks.unist.ac.kr/handle/201301/59281
DOI
10.1039/d2cp02641d
ISSN
1463-9076
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CHM_Journal Papers
ECHE_Journal Papers
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