Subject: | |
From: | |
Reply To: | |
Date: | Tue, 22 Aug 2006 13:53:06 -0500 |
Content-Type: | text/plain |
Parts/Attachments: |
|
|
JEOL Probe Users Listserver
Moderator: Ellery Frahm, [log in to unmask],
Electron Microprobe Lab, University of Minnesota
Post a message: send your message to [log in to unmask]
Unsubscribe: send "SIGNOFF PROBEUSERS" to [log in to unmask]
On-line help and FAQ: http://probelab.geo.umn.edu/listserver.html
*
We have acquired a nice new SEM (W filament, variable pressure
Hitachi S3400) whose function principally is quality CL imaging
(Gatan PanaCL/F), and EBSD (HKL) work.
We have a question for labs out there with more EBSD experience under
their belts than we do: have you determined an optimal keV setting,
for any/all of your work? (we are doing geological work)
It seems to me that you don't want to go to higher keV than necessary
as the scattering will increase (though the effective backscattered,
oops forescattered electron signals that are relevant may only be
those from the first events near the surface, suggested by Prior
[1999]) and the spatial resolution will decrease (though I am not
convinced about this) -- or does going to high keV improve the signal
generated on the phosphor screen and thus improve the Kukchi line
discrimination? Clearly having significant counts (=high enough
current) is probably the most important factor, but given that is not
a problem, would say 30 keV yield better results vs 15 keV?
thanks.
John
--
========================================================
John Fournelle, Ph.D. office: (608) 262-7964 cell: (608) 438-7480
Cameron Electron Microprobe Lab lab: (608) 265-4798
Dept of Geology & Geophysics fax: (608) 262-0693
University of Wisconsin home: (608) 274-2245
1215 West Dayton St. email: [log in to unmask]
Madison, WI 53706 amateur radio: WA3BTA
Personal http://www.geology.wisc.edu/~johnf/
Probe lab http://www.geology.wisc.edu/~johnf/sx51.html
Probe Sign Up Calender:
http://www.microscopy.wisc.edu/cgi-bin/calendar/microprobe/calendar.cgi
"The first rule of all intelligent tinkering is to save every cog and
wheel." -- Aldo Leopold
"For a successful technology, reality must take precedence over
public relations, for Nature cannot be fooled." -- Richard P.
Feynman
|
|
|