- Ifeffit - millenia.cars.aps.anl.gov

Re: [Ifeffit] Kapton in glove box (Todd Monson)
by Monson, Todd 06 Aug '09

06 Aug '09

Thanks for all your comments regarding kapton tape and measuring air and moisture sensitive compounds. Many of my samples are indeed air sensitive and not just moisture sensitive (iron nanoparticles). If my particles are dispersed in solvent will the kapton be resistant to that solvent (at least during the time that the solvent is evaporating from the tape in the glove box)? Darek mentioned kapton dots - could you tell me where I can purchase these? Thanks again for everyone's help, I thought this mailing list was primarily for software related questions but I am finding it is useful to get help on any XAFS related questions. Todd -----Original Message----- From: ifeffit-bounces(a)millenia.cars.aps.anl.gov [mailto:ifeffit-bounces@millenia.cars.aps.anl.gov] On Behalf Of ifeffit-request(a)millenia.cars.aps.anl.gov Sent: August 06, 2009 1:50 AM To: ifeffit(a)millenia.cars.aps.anl.gov Subject: Ifeffit Digest, Vol 78, Issue 3 Send Ifeffit mailing list submissions to ifeffit(a)millenia.cars.aps.anl.gov To subscribe or unsubscribe via the World Wide Web, visit http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit or, via email, send a message with subject or body 'help' to ifeffit-request(a)millenia.cars.aps.anl.gov You can reach the person managing the list at ifeffit-owner(a)millenia.cars.aps.anl.gov When replying, please edit your Subject line so it is more specific than "Re: Contents of Ifeffit digest..." Today's Topics: 1. Re: Kapton in glove box (Scott Calvin) 2. Re: Kapton in glove box (Zajac, Dariusz A.) 3. Re: Kapton in glove box (Maurits van den Berg) ---------------------------------------------------------------------- Message: 1 Date: Wed, 05 Aug 2009 20:47:48 -0400 From: Scott Calvin <SCalvin(a)slc.edu> Subject: Re: [Ifeffit] Kapton in glove box To: XAFS Analysis using Ifeffit <ifeffit(a)millenia.cars.aps.anl.gov> Cc: Scott Calvin <scalvin(a)slc.edu> Message-ID: <025FE360-0E9F-4421-A22D-2074D838AFB7(a)slc.edu> Content-Type: text/plain; charset="us-ascii" Good point on the cardboard, Richard. I always pre-cut strips of Kapton tape, so that I wasn't bringing in cardboard at all. --Scott Calvin Sarah Lawrence College On Aug 5, 2009, at 8:13 PM, Richard Mayes wrote: > Todd, > > Are you working with oxygen sensitive or moisture sensitive samples > (or both)? If it's just moisture sensitive, then you can use regular > 2-sided tape from your local office supply and polypropylene film to > seal samples in polycarbonate or aluminum holders (or even pellets if > you're lucky enough to be able to press pellets that hold their > shape). Chemplex Industries is where I have gotten the polypropylene > films I have used (and Kapton as well - www.findtape.com also has a > good selection of Kapton tape). > > I used this method with many samples that involved heavily chlorided > titanium on silica and had few problems if they're used within 5-7 > days after packing in a glove box (the samples with problems resulted > from improperly sealed samples). You can get jars (baby food jars > work very well to ship individual samples) to store the samples for > shipping and if you pack the jars in the glove box, you will have the > box atmosphere in the jars, for a little while anyway. > > A note on oxygen sensitivity (and to an extent moisture > sensitivity): you probably already know this, but I'll say it > anyway...if cardboard is present in the role of Kapton tape, you may > have oxygen/water diffusion from the cardboard for a few days after > you take it into the box. Our rule of thumb was to pull vacuum on > anything involving cardboard for at least 48 hrs before taking it into > the box. All that to say, take your supplies into the box a few days > ahead of time to allow your box catalyst to take care of any residual > oxygen/water that make their way in. > > HTH, > -Richard

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Kapton in glove box
by Scott Calvin 06 Aug '09

06 Aug '09

Hi Todd, I've taken the liberty of posting your question to the Ifeffit mailing list. You're likely to get more accurate and quicker answers to these kinds of questions there. (For the rest of you: Todd is asking about the technique of preparing air-sensitive samples in a glove box, putting them on Kapton tape, sealing them in plastic bags, and transporting them to the beamline, shooting right through the bags.) I'll take my shots, though: It's hard for me to imagine adsorbed oxygen on the Kapton being more significant than the other sources of stray oxygen that can be present in a glove box. After all, the Kapton's in there too. And I don't think it's going to be more significant than the oxygen that diffuses through the plastic bags during transport. The thinner the Kapton tape, the better, as that will minimize the absorption due to the tape. It used to be hard to find 1 mil Kapton tape with adhesive, but now it's easy. Hephaestus will give you the absorption of Kapton, so you can judge how big an effect it will be at the energies at which you'll work. --Scott Calvin Sarah Lawrence College On Aug 4, 2009, at 2:39 PM, Monson, Todd wrote: > Scott, > > Thanks. Is it pretty reasonable to assume that the kapton tape that > you put your samples on doesn’t have any adsorbed oxygen that could > affect your samples? Do you do anything to clean the kapton? Where > are some good places to buy the kapton (and do you need to purchase > rather thin kapton tape for doing XAFS)? > > Thanks again, > > Todd > > From: Scott Calvin > Sent: August 04, 2009 11:34 AM > To: Monson, Todd > Cc: Scott Calvin > Subject: Re: mossbauer > > Hi Todd, > > Regular zip-loc bags work just fine. For heat sealers I've used > everything from a heat sealer manufactured for the purpose to a > little propane torch--even a cigarette lighter should work. Putting > one sealed bag inside another, if the energy you're working at > allows it, seems to work quite well. > > --Scott > > > On Aug 4, 2009, at 1:15 PM, Monson, Todd wrote: > > > Scott, > > I had another question – what kind of plastic bags and heat sealers > do you use for sealing up your air-sensitive XAFS samples? And > where could I buy them? > > Thanks, > > Todd >

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Re: [Ifeffit] Ifeffit Digest, Vol 77, Issue 30
by Eugenio Otal 04 Aug '09

04 Aug '09

Hi Rafael, I usually use the same compiler with the option -o only I will try the -O0 option. Thanks, euG 2009/7/31 <ifeffit-request(a)millenia.cars.aps.anl.gov> > Send Ifeffit mailing list submissions to > ifeffit(a)millenia.cars.aps.anl.gov > > To subscribe or unsubscribe via the World Wide Web, visit > http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit > or, via email, send a message with subject or body 'help' to > ifeffit-request(a)millenia.cars.aps.anl.gov > > You can reach the person managing the list at > ifeffit-owner(a)millenia.cars.aps.anl.gov > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Ifeffit digest..." > > > Today's Topics: > > 1. Re: NLEG (Rafael Rodr?guez Pappalardo) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Thu, 30 Jul 2009 12:22:47 +0200 > From: Rafael Rodr?guez Pappalardo <rafapa(a)us.es> > Subject: Re: [Ifeffit] NLEG > To: ifeffit(a)millenia.cars.aps.anl.gov > Message-ID: <200907301222.47267.rafapa(a)us.es> > Content-Type: Text/Plain; charset="us-ascii" > > Dear Eugenio, > which compiler was used to compile FEFF? > I have "solved" the problem compiling with Intel Fortran with -O0. > > Best regards, > > Rafael > -- > Dr. Rafael R. Pappalardo > Dept. of Physical Chemistry, Univ. de Sevilla (Spain) > e-mail: rafapa(a)us.es > > > ------------------------------ > > _______________________________________________ > Ifeffit mailing list > Ifeffit(a)millenia.cars.aps.anl.gov > http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit > > > End of Ifeffit Digest, Vol 77, Issue 30 > *************************************** >

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conventional unit cell to primitive cell
by Mudit Dixit 30 Jul '09

30 Jul '09

Dear sir , If you have found any way convert conventional unit cell to primitive cell please tell me I am also looking for it. I have material studio if you know how to do it material studio please tell me. -- With Best Regards, Mudit Dixit JRF c/o Dr. Saurav Pal Physical Chemistry Division, Center For Excellence in Advance Computing PUNE ,INDIA

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Re: [Ifeffit] NLEG
by Rafael Rodríguez Pappalardo 30 Jul '09

30 Jul '09

Dear Eugenio, which compiler was used to compile FEFF? I have "solved" the problem compiling with Intel Fortran with -O0. Best regards, Rafael -- Dr. Rafael R. Pappalardo Dept. of Physical Chemistry, Univ. de Sevilla (Spain) e-mail: rafapa(a)us.es

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Comparing similar peak positions in Fourier transform with fitting results
by Hashem Stietiya 29 Jul '09

29 Jul '09

Greetings to all, I am working on Zn binding to Fe and Al oxides and I am trying to fit the second and third shells. I have three spectra from three samples that differ in a particular treatment. Visually speaking, the Fourier transforms for all these spectra show second and third shells at 2.6 and 3.2A (uncorrected for phase shift), respectively. I fit the second shell with Fe and the third shell with Al. From the fitting results I obtained the Zn-Fe and Zn-Al radial distances for the second and third shells. However, these Zn-Fe and Zn-Al radial distances were different among the samples. For example, the Zn-Fe radial distance was 3.18A for sample 1, 3.44A for sample 2 and 3.51A for sample 3. My question is: if the peaks in the Fourier transforms are at the same position for all samples, why is it that the fitting shows that the radial distances are actually different? NOTE: I fit the 1st,2nd and 3rd shells(R range:1.0-3.2A) together. Thank you, Hashem Stietiya School of Plant, Soil and Environmental Sciences Louisiana State University

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Re: [Ifeffit] background subtraction
by umesh palikundwar 28 Jul '09

28 Jul '09

Go through the Athena Manual and the project files therein. Umesh > From: ifeffit-request(a)millenia.cars.aps.anl.gov > Subject: Ifeffit Digest, Vol 77, Issue 26 > To: ifeffit(a)millenia.cars.aps.anl.gov > Date: Sun, 26 Jul 2009 12:00:02 -0500 > > Send Ifeffit mailing list submissions to > ifeffit(a)millenia.cars.aps.anl.gov > > To subscribe or unsubscribe via the World Wide Web, visit > http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit > or, via email, send a message with subject or body 'help' to > ifeffit-request(a)millenia.cars.aps.anl.gov > > You can reach the person managing the list at > ifeffit-owner(a)millenia.cars.aps.anl.gov > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Ifeffit digest..." > > > Today's Topics: > > 1. background subtraction (yavuz al) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Fri, 24 Jul 2009 16:04:41 -0700 > From: yavuz al <yavuzal1(a)hotmail.com> > Subject: [Ifeffit] background subtraction > To: <ifeffit(a)millenia.cars.aps.anl.gov> > Message-ID: <BLU116-W2649DF9BAA31B6973E611892190(a)phx.gbl> > Content-Type: text/plain; charset="windows-1252" > > > Hi all, > > I have some Zn L2-L3-edge XANES spectra. I am not sure how to remove the > background and normalize these data using athena?If you can help me about this I will be very glad > > thanks > yavuzz > _________________________________________________________________ > Windows Live? SkyDrive?: Store, access, and share your photos. See how. > http://windowslive.com/Online/SkyDrive?ocid=TXT_TAGLM_WL_CS_SD_photos_072009 >

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edge height proportional to the molar density?
by Haiyan Zhao 25 Jul '09

25 Jul '09

I am wondering whether the edge height could be used to estimate molar density or not. If so, is there any reference about such kind of calculation? Thanks! Haiyan

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background subtraction
by yavuz al 24 Jul '09

24 Jul '09

Hi all, I have some Zn L2-L3-edge XANES spectra. I am not sure how to remove the background and normalize these data using athena?If you can help me about this I will be very glad thanks yavuzz _________________________________________________________________ Windows Live™ SkyDrive™: Store, access, and share your photos. See how. http://windowslive.com/Online/SkyDrive?ocid=TXT_TAGLM_WL_CS_SD_photos_072009

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Sorry
by Chris Patridge 23 Jul '09

23 Jul '09

I forgot to post a bitmap of the spectra of the previous message. Thank you all. -- Christopher J. Patridge Graduate Student SUNY Buffalo - Dept of Chemistry 716-645-6800 x 2110 315-529-0501

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