JOHN FOURNELLE

Ph.D. 1989
Johns Hopkins University

Director, Eugene Cameron Electron Microprobe Lab
Contact:
Weeks Hall Room 306
1215 West Dayton St.
Madison, WI 53706
email: johnf(at)geology.wisc.edu
office: 608-262-7964
cell: 608-438-7480

Updated 10/15/2012

UW Electron Microprobe Lab

I run the UW-Madison electron microprobe lab, the ONLY ELECTRON MICROPROBE in the state of Wisconsin. Our lab consists of a Cameca SX51 electron microprobe, sn #485, installed in late 1993, and associated equipment. It was the first SX51, delivered by Cameca of maybe 6-8 similar ones between the older SX50 and the next generation SX100.

I have been using electron probes since 1985: the old MAC at the Geophysical Lab in the mid 1980s, the Smithsonian's ARL-SEMQ 1989-91, Johns Hopkins' JEOL 8600 1991-92, UW's old ARL-SEMQ 1992-93, and our current Cameca SX51 (1993-today).

The electron probe is a "specialized SEM on steroids": its forte is accuracy in microanalysis, because
(1) it explicitly uses standards (so results are not artifically normalized to 100 wt%, thus has built in QC/reality check),
(2) it has very high spectral resolution and can resolve otherwise impossible (by EDS) peak overlaps,
(3) it has low detection limits so trace element measurements are possible in many cases,
(4) we can accurately measure elements as light as B, and
(5) we can accurately measure thin films and coatings either using (a) the multiple voltage technique or (b) low voltages in certain specific cases.

A lot more information about our electron microprobe


Some of my geological/volcanological research and other interests


Go to Electron Microprobe Page
Go to UW-Geology &Geophysics Page