Acta Optica Sinica, Volume. 10, Issue 1, 36(1990)
Observation of electrostatic field generated by point-charges and measurement of charged quantity by electron holography
A Simple and easy method is used for preparation of the electrostatic field specimen In this paper. On account of following physical factor, some dielectric particles supported by a thin carbon film, for example, polystarene latex spheres, 0.31 m in diameter, will become a charged body during the observing in electron microscope because of electrostatic aocomnlation. Obviously, under the electron beam, the spheres, of radius r, acquire a stationary positive charge Q, and the resulting field can be simply modelled by that of a point charge Q. With the field model, the electrostatic field distribution were observed and the magnitude of the charged quantity is determined by electron holography.
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[in Chinese]. Observation of electrostatic field generated by point-charges and measurement of charged quantity by electron holography[J]. Acta Optica Sinica, 1990, 10(1): 36