Tang W X, Jesson D E, Pavlov K M, Morgan M J, Usher B F
School of Physics, Monash University, Victoria 3800, Australia.
J Phys Condens Matter. 2009 Aug 5;21(31):314022. doi: 10.1088/0953-8984/21/31/314022. Epub 2009 Jul 7.
We apply Lloyd's mirror photoemission electron microscopy (PEEM) to study the surface shape of Ga droplets on GaAs(001). An unusual rectangular-based droplet shape is identified and the contact angle is determined in situ. It is shown that quenching does not appreciably affect droplet shape and ex situ measurements of the contact angle by atomic force microscopy are in good agreement with Lloyd's mirror PEEM. Extension of Lloyd's mirror technique to reconstruct general three-dimensional (3D) surface shapes and the potential use of synchrotron radiation to improve vertical resolution is discussed.
我们应用劳埃德镜光发射电子显微镜（PEEM）来研究砷化镓（001）上镓液滴的表面形状。识别出一种不寻常的基于矩形的液滴形状，并原位测定接触角。结果表明，淬火对液滴形状没有明显影响，通过原子力显微镜对接触角进行的非原位测量与劳埃德镜PEEM结果吻合良好。讨论了将劳埃德镜技术扩展用于重建一般的三维（3D）表面形状以及利用同步辐射提高垂直分辨率的潜在用途。
