June 2012


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Julien Allaz <[log in to unmask]>
Reply To:
Julien Allaz <[log in to unmask]>
Wed, 20 Jun 2012 16:07:00 -0600
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Electron Microprobe Lab, University of Minnesota

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Sorry, I meant a beam resolution of ca. 0.7 MICRO-meter (not nm...) with 
a LaB6....


On 6/20/12 1:06 AM, Gerald Schmidt wrote:
> JEOL Probe Users Listserver
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> Electron Microprobe Lab, University of Minnesota
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> *
> Ritchie,
> what an exciting prospect! I hope your case will be successful.
> I work at an institute that's mainly focused on materials research. We
> are using a medium-old SEM (W cathode) and a medium-new EPMA (JXA-8100).
> Our researchers as well as our industrial partners appreciate both
> methods for their respective strengths.
> Would your department cooperate with the the School of Engineering, i.e.
> would your new microprobe be available to them? If so, I think they
> should be quite supportive!
> According to the website of the Research Centre for Surface and
> Materials Science (RCSMS), their SEM equipment is new and provides
> high-performance electron imaging thanks to their Field Emission (FE)
> sources. A microprobe could and should not compete with that. However,
> even high-performance FE SEMs can not provide better spectral EDS
> resolution than the WDS of a microprobe. For example, how do they
> resolve the problem of line overlaps, such as Mo and S?
> Especially in our research field of high temperature materials, we often
> look at alloys containing Mo, and aggressive environments containing S,
> and we want to be able to tell what happens on and below the metal
> surface when those alloys are exposed to high temperatures in aggressive
> environments. You could think of other examples too, and I'm sure the
> RCSMS would love to have a WDS solution at hand!
> Another strength of the EPMA clearly is element mapping. Even the
> coolest FE SEM will produce rather sad looking maps (some examples
> provided on the RCSMS website). I bet if you show a comparison of EDS /
> WDS maps this will convince some people! Especially industrial
> researchers love our colourful WDS maps.
> Finally, when it comes to precise quantification of alloying elements in
> special steels or Nickel-base alloys, we know we cannot rely on EDS.
> Even just the word "standardless" should ring some alarm bells!
> Of course it will be challenging to make this point without sounding too
> critical about the work that's been done at the RCSMS so far ;-)
> Good luck!
> Gerald
> ------------------------
> Dr. Gerald Schmidt
> DECHEMA-Forschungsinstitut
> High Temperature Materials
> Theodor-Heuss-Allee 25
> 60486 Frankfurt am Main
> Germany
> Tel:     +49-69-7564-355
> Fax:    +49-69-7564-388
> E-Mail: [log in to unmask]
> DECHEMA-Forschungsinstitut • Stiftung bürgerlichen Rechts
> Vorstand: Prof. Dr.-Ing. Michael Schütze (Vors.), Priv.-Doz. Dr. Jens
> Schrader
> Sitz der Stiftung: Frankfurt am Main
> Anerkannt durch das Regierungspräsidium Darmstadt unter Az.
> I13-25d04/11-(12)-720
> Steuer-Nr.: 45 255 00182
> -----Ursprüngliche Nachricht-----
> Von: JEOL-Focused Probe Users List [mailto:[log in to unmask]] Im
> Auftrag von Ritchie Sims
> Gesendet: Donnerstag, 14. Juni 2012 09:12
> An: [log in to unmask]
> Betreff: [PROBEUSERS] Case for a new EPMA
> Hi
> For the past ten years we have been using a JXA-840A with EDS for
> quantitative geological
> work, it's been OK, for analytes > about 0.2%, but there is a chance now
> to make a case for
> a brand-new 'proper' EPMA.
> The complication is that we have to find as many potential users, from
> within and without the
> University, to support us.
> In the School of Engineering there are a couple of SemS, with close ties
> to local industry, and
> because their standardless analytical packages give element
> concentrations to two decimal
> places, they and their users accept that their results are quantitative
> (!).
> They are likely to oppose our getting a new EPMA as it would probably
> reduce their revenue
> stream.
> I know virtually nothing of probe applications outside Geology.
> I would really appreciate hearing of EPMA projects and applications in
> non-geological fields
> to help me prepare a case. It would be great to list those for which an
> EPMA beats an SEM
> hands-down.
> cheers
> Ritchie
> --
> Ritchie Sims Ph D				Phone : 64 9 3737599 ext
> 87713
> Microanalyst                 				Fax   : 64 9
> 3737435
> Department of Geology        			email :
> [log in to unmask]
> The University of Auckland
> Private Bag 92019
> Auckland
> New Zealand

Dr. Julien Allaz
Research Associate
Electron microprobe manager
University of Colorado Boulder
Geological Sciences
UCB 399
2200 Colorado Ave.
Boulder, CO 80309-0399

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