Thanks Rob., Good thought, but definitively Cu++; we get the right energy shift and the right shape for XANES (linear Cu+ is very distinctive). We actually maintain nice oxidising conditions (4 bar of air applied to the capillary), and the spectra were stable over time (slew scan mode, with ~5 minutes per scan, and 10 scans collected).
Note that Cu+ is not stable in solution unless you give it a ligand such as chloride; reduction to Cu+ in our solution most likely would result in precipitation of Cu(0) via disproportionation. No evidence for this at all. > On 22 Apr 2023, at 12:14 pm, Robert Gordon <ragor...@alumni.sfu.ca> wrote: > > Hi Joel, > > How much edge shift are you seeing between your foil and the solution? > Cu+2 is about 4.5 eV up from Cu metal...you seeing about that much? > > Cu+2 can photoreduce...I know Cu+(aq) isn't stable, but maybe some complex is > forming? > Just a thought...CN=2 and I think linear Cu+ > > -R. > > On 2023-04-21 6:58 p.m., Joel Brugger wrote: >> Capillary is silica glass :-) >> >>> On 22 Apr 2023, at 11:57 am, Anatoly Frenkel >>> <anatoly.fren...@stonybrook.edu <mailto:anatoly.fren...@stonybrook.edu>> >>> wrote: >>> >>> Capillary made or what? >>> >>> Anatoly >>> >>>> On Apr 21, 2023, at 9:52 PM, Joel Brugger <joel.brug...@monash.edu >>>> <mailto:joel.brug...@monash.edu>> wrote: >>>> >>>> Fluo, 0.5 wt% Cu. >>>> >>>>> On 22 Apr 2023, at 11:41 am, Anatoly Frenkel >>>>> <anatoly.fren...@stonybrook.edu <mailto:anatoly.fren...@stonybrook.edu>> >>>>> wrote: >>>>> >>>>> Fluorescence or transmission? >>>>> What is the Cu concentration? Could be self absorption. >>>>> >>>>> Anatoly >>>>> >>>>>> On Apr 21, 2023, at 9:31 PM, Joel Brugger <joel.brug...@monash.edu >>>>>> <mailto:joel.brug...@monash.edu>> wrote: >>>>>> >>>>>> Dear list, >>>>>> >>>>>> We are trying to fit EXAFS from data collected on solutions within a >>>>>> capillary. The capillary has OD 1mm, ID 0.8mm, and was placed >>>>>> horizontally. The beam is 1x2 mm (VxH). >>>>>> >>>>>> Fitting the copper reference foil, we get the expected SO2 value of ~0.7. >>>>>> >>>>>> However, the solution containing the Cu(II) aqua ion gives a >>>>>> coordination of 2, instead of the expected 5-6. So our SO2 for this >>>>>> solution is apparently ~0.25. >>>>>> >>>>>> I couldn’t find a discussion of the effect of geometry (in our case >>>>>> cylindrical rather than planar) on SO2. Is it possible that the low SO2 >>>>>> is a result of the odd geometry? >>>>>> >>>>>> Confused as ever, >>>>>> >>>>>> JOEL >>>>>> >>>>>> >>>>>> Joël Brugger >>>>>> Professor of Synchrotron Geosciences >>>>>> >>>>>> Monash University >>>>>> School of Earth, Atmosphere and Environment >>>>>> Room 257A, Level 2, 9 Rainforest Walk <x-apple-data-detectors://2> >>>>>> Clayton, Victoria 3800 <x-apple-data-detectors://2> >>>>>> Australia <x-apple-data-detectors://2> >>>>>> >>>>>> T: +61 3 9905 4898 <tel:+61%203%209902%209095> >>>>>> E: joel.brug...@monash.edu <mailto:andrew.mackint...@monash.edu> >>>>>> Twitter: @JoelBrugger >>>>>> >>>>>> _______________________________________________ >>>>>> Ifeffit mailing list >>>>>> Ifeffit@millenia.cars.aps.anl.gov >>>>>> <mailto:Ifeffit@millenia.cars.aps.anl.gov> >>>>>> http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit >>>>>> <http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit> >>>>>> Unsubscribe: http://millenia.cars.aps.anl.gov/mailman/options/ifeffit >>>>>> <http://millenia.cars.aps.anl.gov/mailman/options/ifeffit> >>>>> _______________________________________________ >>>>> Ifeffit mailing list >>>>> Ifeffit@millenia.cars.aps.anl.gov >>>>> <mailto:Ifeffit@millenia.cars.aps.anl.gov> >>>>> http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit >>>>> <http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit> >>>>> Unsubscribe: http://millenia.cars.aps.anl.gov/mailman/options/ifeffit >>>>> <http://millenia.cars.aps.anl.gov/mailman/options/ifeffit> >>>> >>> _______________________________________________ >>> Ifeffit mailing list >>> Ifeffit@millenia.cars.aps.anl.gov <mailto:Ifeffit@millenia.cars.aps.anl.gov> >>> http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit >>> <http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit> >>> Unsubscribe: http://millenia.cars.aps.anl.gov/mailman/options/ifeffit >>> <http://millenia.cars.aps.anl.gov/mailman/options/ifeffit> >> >> >> >> _______________________________________________ >> Ifeffit mailing list >> Ifeffit@millenia.cars.aps.anl.gov <mailto:Ifeffit@millenia.cars.aps.anl.gov> >> http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit >> <http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit> >> Unsubscribe: http://millenia.cars.aps.anl.gov/mailman/options/ifeffit >> <http://millenia.cars.aps.anl.gov/mailman/options/ifeffit> > > _______________________________________________ > Ifeffit mailing list > Ifeffit@millenia.cars.aps.anl.gov > http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit > Unsubscribe: http://millenia.cars.aps.anl.gov/mailman/options/ifeffit
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