Shinku

Recent Progress and Application of Mass Filter

I. Principle and Performance as a Mass Spectrometer

Tadashi SAKAI

1974 Volume 17 Issue 3 Pages 71-80
Published: March 20, 1974
Released on J-STAGE: September 29, 2009

DOIhttps://doi.org/10.3131/jvsj.17.71

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EL and PEL in ZnS (Cu, Mn, Cl) Thin Films

Hideo HASEGAWA, Shuso NAKAGAWA, Kunio TAKAGI

1974 Volume 17 Issue 3 Pages 81-89
Published: March 20, 1974
Released on J-STAGE: September 29, 2009

DOIhttps://doi.org/10.3131/jvsj.17.81

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ZnS (Cu, Mn, Cl) films were prepared by varying the source temperature at the opening and closing of a deposition under a fixed schedule of raising the source temperature. Series of data with electroluminescent (EL), photoluminescent (PL), photo-electroluminescent (PEL) and photovoltaic effect are presented as a function of the source temperature. From these experiments, it was cleared that there is an optimum opening and closing time for efficient EL and PEL emission as the applied voltage on counter electrode Al is negative. From the change of photovoltage and PL spectrum with successive deposition, the type of n or p of a layer constituting the films and the behavior of impurity diffusion during deposition are discussed. It is supposed that the EL emission may be originated in n-p barrier formed in an inner part of the films and that the PEL effect may be caused by the barrier and photoconductive layer near the barrier. Comparison of properties with other films prepared in different other conditions, which emit EL light by the application of positive voltage on counter electrode, is also described.

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Total Pressure Measurement of Ultrahigh Vacuum with Modulated Bayard-Alpert Gauge

Kenya AKAISHI

1974 Volume 17 Issue 3 Pages 90-98
Published: March 20, 1974
Released on J-STAGE: September 29, 2009

DOIhttps://doi.org/10.3131/jvsj.17.90

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Two Bayard-Alpert type ionization gauges with modulator have been used to measure a total pressure of ultrahigh vacuum system, which is made of stainless steel and is evacuated by a sputter ion pump, a titanium sublimation pump and a cryosorption pump (with liquid helium). By using a cold cathode Magnetron gauge (NRC #552) as a reference gauge, the ultimate pressure of the system is estimated to be about 1.2×10^-12 Torr. With the application of the modulation methodes, an original method proposed by Redhead and a modified method by Tuzi, the two errors, namely the soft×-ray photocurrent error and the electronic desorbed ion current error, which appear independently, have been investigated. In the method by Redhead, the modulated photocurrent corresponds to a pressure of 7.2× 10^-12 Torr, while in the method by Tuzi et al., the error of the modulated photocurrent can not be clearly measured, rather it is found that the range of lowest measurable pressure is extended to 6.2×10^-12 Torr. The other error due to electronic desorbed ion current is investigated with an operation of the B-A gauge under CO gas pressure from 1.8×10 ^-11 Torr to 1.1×10^-9 Torr, and it is concluded that this error can be reduced to the order of several per cent when the gauge is operated at a higher electron emission current (≥ 5 mA).

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