Non-destructive quantum reflection of helium dimers and trimers from a plane ruled grating
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- Non-destructive quantum reflection of helium dimers and trimers from a plane ruled grating
- Zhao, Bum Suk; Zhang, Weiqing; Schollkopf, Wieland
- Issue Date
- TAYLOR & FRANCIS LTD
- MOLECULAR PHYSICS, v.111, no.12-13, pp.1772 - 1780
- We report on the non-destructive scattering and diffraction of He, He2 and He3 from a plane ruled reflection grating. At grazing incidence the normal component of the particle's wave-vector is sufficiently small to allow for quantum reflection at the attractive Casimir-van der Waals particle-surface interaction potential. Quantum reflection occurs tens of nanometres in front of the surface, before the dimers and trimers reach the region where the surface-induced forces would inevitably cause the breakup of the fragile bonds. The reflected particles are identified via their mass-dependent diffraction angles and by mass spectrometry. The intensity distributions of the observed diffraction patterns are discussed in terms of the grating's blaze angle.
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