By Nagamitsu Yoshimura
ISBN-10: 443154447X
ISBN-13: 9784431544470
ISBN-10: 4431544488
ISBN-13: 9784431544487
This publication describes the developmental historical past of the vacuum approach of the transmission electron microscope (TEM) on the Japan Electron Optics Laboratory (JEOL) from its inception to its use in today’s high-technology microscopes. the writer and his colleagues have been engaged in constructing vacuum know-how for electron microscopes (JEM sequence) at JEOL for a few years. This quantity offers a precis and clarification in their paintings and the expertise that makes attainable a fresh ultrahigh vacuum.
The normal clients of the TEM are top-level researchers operating on the frontiers of latest fabrics or with new organic specimens. they generally use the TEM below super critical stipulations, with difficulties occasionally taking place within the vacuum approach of the microscopes. JEOL engineers then needs to paintings as quick as attainable to enhance the vacuum evacuation approach with a view to hinder the recurrence of such difficulties. one of the wealth of explanatory fabric during this e-book are examples of clients’ stories of difficulties within the vacuum procedure of the JEM, comparable to the incidence of a micro-discharge and the back-streaming of the diffusion pump (DP) oil vapor.
This paintings is a necessary source for researchers who use the transmission electron microscope and for engineers and scientists attracted to its technology.
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Additional resources for Historical Evolution Toward Achieving Ultrahigh Vacuum in JEOL Electron Microscopes
Example text
B) Argon discharge, perfluoropolyether fluid (silver film coated on outside of bottle beneath coupling electrodes and subsequently removed before photography). (c) Argon discharge, polyphenylether fluid. -like deposit which was removed before photographing in (b)) [10] Any vacuum pump with fluorocarbon oxide fluid did not come onto the market at that time. It was questionable whether our DP or RP worked well or not with one of fluorocarbon oxide fluids. It was uncertain whether perfluoropolyether can be cleaned or not with conventional cleaning solvent when an accident of DP-oil-vapor backstreaming occurred in EMs.
2. Abnormally large amount of H2O molecules must be evolved from the anodized surface with narrow capillaries and deep vacancies. I had read an important paper titled “The preventionof contamination without beam damage to the specimen” by Heide [3]. 1 Accidents Occurred in the Vacuum Systems of JEMs 29 Fig. ) is used between the test dome (TD) and the first diffusion pump (DP1, Diffstak 100/300) the specimen is easily etched. 3. The paper also presents the information that in the electron microscope this phenomenon easily occurs when the temperature of the cool trap surface is around −100 °C.
I informed the detail of the said accident to the electric designing department with the specification of modified sequence control. 38 3 Accidents and Information, Instructing Us to Improve the Vacuum Systems of JEMs Sequence-control of vacuum system having a sufficient time period for thermal- conduction vacuum gauges like a Pirani gauge, received the patent approval [7]. 9 T he Lead-Glass Window of the Viewing Chamber, Getting Gloomy After EM-Film Magazine Exchanged A backstreaming accident occurred on a customer’s EM (JEM-100C with the earliest-type cascade DP system).
Historical Evolution Toward Achieving Ultrahigh Vacuum in JEOL Electron Microscopes by Nagamitsu Yoshimura
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