Aluminized mylar has a much lower permeability to oxygen than 
polyethylene and still works with a heat-sealer.  I'm assuming you're in 
the hard- or tender X-ray range.
	mam

On 3/22/2025 12:16 PM, Carlo Segre via Ifeffit wrote:
> Hi Helen, We have had luck using a vacuum sealing system such as used 
> for food. However the Polyethylene is subject to degradation under the 
> beam so that wrapping with Kapton is helpful as well as double bagging 
> it. Finally, if you keep it under
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> Hi Helen,
> 
> We have had luck using a vacuum sealing system such as used for food.  
> However the Polyethylene is subject to degradation under the beam so 
> that wrapping with Kapton is helpful as well as double bagging it.  
> Finally, if you keep it under Argon when transporting it to the beamline 
> and then in a helium filled chamber, you should avoid the oxidation.
> 
> Carlo
> 
> 
> --
> Carlo Segre, Duchossois Professor of Physics
> Illinois Institute of Technology
> ------------------------------------------------------------------------
> *From:* Helen Chen via Ifeffit <ifeffit@millenia.cars.aps.anl.gov>
> *Sent:* Tuesday, March 18, 2025 8:05 PM
> *To:* ifeffit@millenia.cars.aps.anl.gov <ifeffit@millenia.cars.aps.anl.gov>
> *Cc:* Helen Chen <helen86@uw.edu>
> *Subject:* [Ext][Ifeffit] Question about Air sensitive sample holder
> Hello, Our group (Jerry Seidler) just started a project involving doing 
> VTC and HERFD on Yb doped CrX3 material. They are thin small crystal 
> sheets and are very air sensitive. We have tried encapsulated them 
> between a layer of laptop tape and
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> This Message Is From an External Sender
> This message came from outside your organization.
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> Hello,
> Our group (Jerry Seidler) just started a project involving doing VTC and 
> HERFD on Yb doped CrX3 material. They are thin small crystal sheets and 
> are very air sensitive. We have tried encapsulated them between a layer 
> of laptop tape and film, but after 12hr we see degradation due to air 
> leaks. I am looking for some advice on air sensitive sample holder. What 
> are some typical methods you use to deal with air sensitivity, 
> especially for samples in thin sheets geometry?
> Thank you
> 
> 
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