Abstract
Intensity fluctuation in HREM granular images of amorphous thin films such as spattered C and Si films has long been noticed among electron microscopists. The granular images are continuously moving as if they were a bunch of living worms. The origin of the fluctuations is believed to be caused by a charging up effect on the film surface. The present paper introduces for this first time the phenomena using a TV image recording system.An amorphous oxide thin film used in the present experiment was formed by decomposing a portion of a Tl2Ba2CaCu2O8 superconductor oxide crystal under electron beam irradiation. The structure of the film may be a random network built up by metal-oxygen polyhedra. The HREM images were recorded at a direct magnification 1.2 × 106 times on a real-time TV camera (Getan 622) attached on an electron microscope (ABT-002B, 200keV, Cs 0.4mm, resolution 0.2nm).
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