scholarly journals X-ray microanalyses in the variable pressure (environmental) scanning electron microscope

2002 ◽  
Vol 107 (6) ◽  
pp. 567 ◽  
Author(s):  
D.E. Newbury
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Environmental Scanning Electron Microscope ◽  
Variable Pressure ◽  
Environmental Scanning ◽  
X Ray ◽  
Scanning Electron

scholarly journals Performance of X-ray Microanalysis in the Variable Pressure or Environmental Scanning Electron Microscope

2006 ◽  
Vol 12 (S02) ◽  
pp. 1492-1493 ◽  
Author(s):  
J-F Le Berre ◽  
K Robertson ◽  
R Gauvin ◽  
GP Demopoulos
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Environmental Scanning Electron Microscope ◽  
Variable Pressure ◽  
Environmental Scanning ◽  
X Ray ◽  
Scanning Electron

Extended abstract of a paper presented at Microscopy and Microanalysis 2006 in Chicago, Illinois, USA, July 30 – August 3, 2006

Microcharacterization of Induced Electric Fields in Poorly Conducting Specimens Irradiated in an Environmental Scanning Electron Microscope

2001 ◽  
Vol 7 (S2) ◽  
pp. 786-787
Author(s):  
Marion A. Stevens-Kalceff
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Electric Fields ◽  
High Vacuum ◽  
Charge Trapping ◽  
Environmental Scanning Electron Microscope ◽  
Variable Pressure ◽  
Environmental Scanning ◽  
Excess Charge ◽  
Scanning Electron

In a conventional scanning electron microscope, a thin, grounded conductive coating is applied to specimens that are poor electrical conductors to prevent retarding and deflection of the incident electron beam. in a variable pressure or environmental scanning electron microscope (ESEM), excess charge on the surface of uncoated poorly conducting specimens is balanced using ionized environmental gas. Ionized gas in environmental mode and grounded conductive coatings in conventional or high vacuum mode minimize charging at the specimen surface, however significant charge trapping may still occur in the implanted sub-surface regions of poorly conducting materials. A small fraction (<10-6) of the incident electrons are trapped at irradiation induced or pre-existing defects within the irradiated specimen. The trapped charge induces a highly localized electric field which can result in electro-migration and micro-segregation of charged mobile defect species within the irradiated micro-volume of specimen.

Accuracy and Precision f Quantitative X-Ray Microanalysis in the Environmental Scanning Electron Microscope (ESEM)

2001 ◽  
Vol 7 (S2) ◽  
pp. 676-677
Author(s):  
Robert A. Carlton ◽  
Charles E. Lyman ◽  
James E. Roberts
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Environmental Scanning Electron Microscope ◽  
Environmental Scanning ◽  
X Ray ◽  
Charge Neutralization ◽  
Carbon Tape ◽  
Glass Spheres ◽  
Accuracy And Precision ◽  
Scanning Electron

This paper presents the results of studies concerning the accuracy and precision of x-ray microanalysis (EDS) in the environmental scanning electron microscope (ESEM). The ESEM is distinguished by its use-of gas in the microscope specimen chamber for imaging and for charge neutralization. Previous work on EDS-ESEM has concentrated either on qualitative x-ray microanalysis or on correction methods to the enlarged x-ray spatial resolution due to the electron skirt. Recent work shows that quantitative analysis is possible once charge neutralization can be accomplished in practice.Accuracy and precision were evaluated in the work presented here using NIST SRM 482 (goldcopper alloys) and NIST SRM K411 (glass beads). The gold-copper alloy wires were prepared by mounting them in epoxy mounts and polishing to a metallurgical finish. The glass spheres were prepared by sprinkling a small amount of the sample onto double-sided carbon tape mounted onto an aluminum SEM stub.

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