タングステン ポイントフィラメントの電界放出模様の観察(III) : バイアス電圧の影響について

Abstract

In order to study the electron optical properties of a point filament in the electron microscope gun, this experiment has been worked. Successive observations of the field emision patterns of a point filament were made by variation of the bias voltage. As a result it was found that the brightness and size of the pattern depended on the bias voltage, and the field emission pattern and the thermoionic pattern were superposed in the case of using the filament at higher temperature. It may be said that the pre-treatment of the filament has an effect on the field emission pattern at lower temperature.