The effects of source size on concentration fluctuations in plumes

1982 ◽  
Vol 22 (3) ◽  
pp. 335-350 ◽  
Author(s):  
J. E. Fackrell ◽  
A. G. Robins
Keyword(s):  
Source Size ◽  
Concentration Fluctuations

Electron sources: Past, present, and future

1993 ◽  
Vol 51 ◽  
pp. 764-765
Author(s):  
David C Joy
Keyword(s):  
Glass Tube ◽  
Source Size ◽  
Electron Gun ◽  
Operating Parameters ◽  
Operational Parameters ◽  
Electron Sources ◽  
Difficult Decision ◽  
Probe Size ◽  
Wide Range ◽  
Overall Performance

The electron source is the most important component of the Scanning electron microscope (SEM) since it is this which will determine the overall performance of the machine. The gun performance can be described in terms of quantities such as its brightness, its source size, its energy spread, and its stability and, depending on the chosen application, any of these factors may be the most significant one. The task of the electron gun in an SEM is, in fact, particularly difficult because of the very wide range of operational parameters that may be required e.g a variation in probe size of from a few angstroms to a few microns, and a probe current which may go from less than a pico-amp to more than a microamp. This wide range of operating parameters makes the choice of the optimum source for scanning microscopy a difficult decision.Historically, the first step up from the sealed glass tube ‘cathode ray generator’ was the simple, diode, tungsten thermionic emitter.

Light Probe for the Measurement of Turbulent Concentration Fluctuations

1963 ◽  
Vol 34 (10) ◽  
pp. 1086-1090 ◽  
Author(s):  
Jon Lee ◽  
Robert S. Brodkey
Keyword(s):  
Concentration Fluctuations ◽  
Light Probe
Sign in / Sign up

Export Citation Format

Share Document