[Ifeffit] Fe K edge spectrum of scorodite

[Maxim Boyanov]

Here's our room-temperature Fe-edge spectrum of scorodite. We measured it
mostly because we could, not because we really needed it--at the time we
were interested in the As edge data as a possible end phase in a geochemical
reactor. The sample and the Fe edge measurements aren't great and the
reference channel disappears once absorption in the sample becomes
significant (the energy axis was aligned as 7112 eV at the inflection point
of an Fe foil). We also took 2D powder diffraction in transmission on the
same tape-mounted sample, so if interested in verifying the purity of the
mineral I am attaching the integrated pattern. We did not prepare the
standard or follow up on these measurements, so use at your own risk :-).

Best,
Max.

Assoc. Prof. Maxim Boyanov
Bulgarian Academy of Sciences
Institute of Chemical Engineering
Sofia 1113, Bulgaria
tel: +359(88)821-9637



> -----Original Message-----
> From: ifeffit-bounces at millenia.cars.aps.anl.gov [mailto:ifeffit-
> bounces at millenia.cars.aps.anl.gov] On Behalf Of Matthew Marcus
> Sent: Monday, July 6, 2015 11:51 AM
> To: XAFS Analysis using Ifeffit
> Subject: Re: [Ifeffit] Fe K edge spectrum of scorodite
> 
> Do you by any chance has a room-temp spectrum?  Most of our data is taken
at
> RT or not much below, and so the LN2 spectrum won't be a perfect match.
> 	mam
> 
> On 7/6/2015 9:12 AM, Case Van Genuchten wrote:
> > Dear Matthew,
> >
> > Sure, the raw data and/or spectrum can be added to the database.  For
this
> sample, the 1st derivative of the Fe foil was 7.112 keV.  I can also
provide
> individual scans for the database, if needed.  Is there any interest in
the As K-
> edge of this sample, too?  I have that one as well.
> > Case
> >
> > On Mon, Jul 6, 2015 at 5:48 PM, Matthew Marcus <mamarcus at lbl.gov
> <mailto:mamarcus at lbl.gov>> wrote:
> >
> >     Thanks!  May I add it to the ALS 10.3.2 reference collection?
> >
> >     What is the standard of energy calibration?  Is the Fe metal edge at
> 7110.75eV, 7112eV or what?
> >              mam
> >
> >     On 7/6/2015 7:11 AM, Case Van Genuchten wrote:
> >
> >         Dear Shaofeng,
> >
> >         I am attaching the averaged, raw data and Fe K-edge EXAFS
spectrum
> (extracted using SixPack) of scorodite.  The mineral was prepared
following the
> procedure outlined in Paktunc et al. (2008).  The data were collected at
the
> Stanford Synchrotron Radiation Lightsource in transmission mode with the
> sample housed in a liquid nitrogen cryostat.  You can find additional
details on
> the preparation of the sample and data collection from the publication
where
> the spectrum is reported and modeled (van Genuchten et al. 2014,
Geochimica
> et Cosmochimica Acta).
> >
> >         Please let me know if you have any other questions about data
> collection.
> >
> >         Best,
> >
> >         Case M. van Genuchten
> >         Environmental Geochemistry Laboratory
> >         Institute of Earth Surface Dynamics
> >         University of Lausanne, Lausanne, CH
> >
> >
> >
> >         On Mon, Jul 6, 2015 at 4:02 AM, Shaofeng Wang
> <wangshaofeng at iae.ac.cn <mailto:wangshaofeng at iae.ac.cn>
> <mailto:wangshaofeng at iae.ac.cn <mailto:wangshaofeng at iae.ac.cn>>> wrote:
> >
> >              Dear all,
> >              Can anyone have Fe K edge exafs spectrum of scorodite share
a copy?
> >              Thanks in advance.
> >              Shaofeng
> >              --------------------------------------
> >              Shaofeng Wang, Ph.D of Geochemistry
> >              Environmental Molecular Science Group
> >              Institute of Applied Ecology, Chinese Academy of Sciences
> >              Shenyang, 110016, China
> >         wangshaofeng at iae.ac.cn <mailto:wangshaofeng at iae.ac.cn>
> <mailto:wangshaofeng at iae.ac.cn <mailto:wangshaofeng at iae.ac.cn>>
> >         www.iae.cas.cn <http://www.iae.cas.cn> <http://www.iae.cas.cn>
> >
> >
> >
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