[log in to unmask]">Hi John,
I've seen significant variation in thickness using sputter coaters, though using metal targets. Here is what Ben Buse showed for Ag on a thin section:
https://probesoftware.com/smf/index.php?topic=1232.0
I would assume it's also a problem for carbon sputter coating, though I have not tested a modern carbon sputter coater.
john
On 12/17/2019 10:33 AM, John H Fournelle wrote:
[log in to unmask]">Does anyone have any comments (direct or indirect evidence) or know of any references, to something I've wondered about for a long time.
Decades ago, someone brought me some samples from materials science here, where I was told that the carbon coating was deposited by sputtering. I had difficulty acquiring good epma results, so I removed the carbon coat, coated in my evaporator, and had good results. From then on, I assumed that
"sputtering of carbon" might not be as "good" as evaporated carbon, though I never did any true test (yes, the coating thickness might have been greatly different from my standards, I know now).
Was I wrong to cast a negative light upon sputtered carbon coating for epma? Any thoughts?
**** JEOL Probe Users ListserverJohn Fournelle Ph.D.
Senior Scientist
Department of Geoscience, University of Wisconsin
1215 West Dayton Street, Madison, WI 53706
mobile 608-438-7480
Moderator: Anette von der Handt, [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/jeoluserlist.html
*
-- John J. Donovan [log in to unmask] University of Oregon (541) 346-4632 (office) 1443 E. 13th Ave (541) 346-4655 (probe) Eugene, OR (541) 346-6854 (FAX) 97403-1241 CAMCOR Web: http://camcor.uoregon.edu/ Facility Web: http://epmalab.uoregon.edu/ Cameca SX100 Schedule: http://camcor.uoregon.edu/wp/calendar/sx100 FEI Quanta Schedule: http://camcor.uoregon.edu/wp/calendar/sem**** JEOL Probe Users ListserverModerator: Anette von der Handt, [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/jeoluserlist.html
*
-- Michael J. Jercinovic Associate Professor Department of Geosciences University of Massachusetts 627 North Pleasant Street Amherst, MA 01003-9297 E-Mail: [log in to unmask] Phone: (413) 545-2431 FAX: (413) 545-1200 http://www.geo.umass.edu/faculty/jercinovic/ Electron Microprobe Laboratory http://www.geo.umass.edu/probe