生长初期的超快扩散：O/Ru(0001)

Ultrafast Diffusion at the Onset of Growth: O/Ru(0001).

作者信息

Kelsall Jack, Townsend Peter S M, Ellis John, Jardine Andrew P, Avidor Nadav

机构信息

Cavendish Laboratory, University of Cambridge, 19 J J Thomson Avenue, Cambridge CB3 0HE, United Kingdom.

Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, New Jersey 08854, USA.

出版信息

Phys Rev Lett. 2021 Apr 16;126(15):155901. doi: 10.1103/PhysRevLett.126.155901.

DOI:10.1103/PhysRevLett.126.155901

PMID:33929255

Abstract

Nanoscopic clustering in a 2D disordered phase is observed for oxygen on Ru(0001) at low coverages and high temperatures. We study the coexistence of quasistatic clusters (with a characteristic length of ∼9 Å) and highly mobile atomic oxygen which diffuses between the energy-inequivalent, threefold hollow sites of the substrate. We determine a surprisingly low activation energy for diffusion of 385±20 meV. The minimum of the O-O interadsorbate potential appears to be at lower separations than previously reported.

摘要

在低覆盖度和高温下，观察到Ru(0001)表面的氧在二维无序相中形成纳米尺度的团簇。我们研究了准静态团簇（特征长度约为9 Å）与在衬底能量不等价的三重空心位之间扩散的高迁移率原子氧的共存情况。我们确定了一个低得出奇的扩散活化能，为385±20 meV。吸附质间氧-氧势的最小值似乎出现在比先前报道更低的间距处。