Coherence during Scattering of Fast H Atoms from a LiF(001) Surface

被引：35

作者：

Lienemann, J. ^{[1
]}

Schueller, A. ^{[1
]}

Blauth, D. ^{[1
]}

Seifert, J. ^{[1
]}

Wethekam, S. ^{[1
]}

Busch, M. ^{[1
]}

Maass, K. ^{[1
]}

Winter, H. ^{[1
]}

机构：

[1] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 06期

关键词：

GRAZING SCATTERING; LIF(100); IONS;

D O I：

10.1103/PhysRevLett.106.067602

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The coherence for diffraction effects during grazing scattering of fast hydrogen and helium atoms from a LiF(001) surface with energies up to some keV is investigated via the coincident detection of two-dimensional angular distributions for scattered projectiles with their energy loss. For keV H atoms, we identify electronic excitations of the target surface as the dominant mechanism for decoherence, whereas for He atoms this contribution is small. The suppression of electronic excitations owing to the band gap of insulators plays an essential role for preserving quantum coherence and thus for the application of fast atom diffraction as a surface analytical tool.

引用

页数：4

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