[Nexus] Using NXxas for XMCD experiments

[Collins, Steve (DLSLtd,RAL,SCI)]

Dear Fernan,
That sounds sensible in as far as XMCD (and XMLD) is XAS with different values for field and/or polarization, both of which are documented.
We have an issue with magnetic_field in that the possible directions are currently very restricted. This probably needs to be changed.
Regards,
Steve

From: NeXus <nexus-bounces at shadow.nd.rl.ac.uk> On Behalf Of Fernan Saiz via NeXus
Sent: 16 March 2023 09:37
To: nexus at nexusformat.org
Cc: Fernan Saiz <fsaiz at cells.es>
Subject: [Nexus] Using NXxas for XMCD experiments


Dear Nexus community,

I was wondering if any member here has been used NXxas<https://manual.nexusformat.org/classes/applications/NXxas.html> for XMCD experiments given that XMCD can be assumed to be the difference of two XAS spectra obtained under plus and minus magnetic fields and divided their sum. The reason behind my question is that I see much simpler to add the information about the magnetic field by filling out e.g. magnetic_field in the NXsample rather than coming up with a new application definition. The former option can be also complemented by providing information about the magnet (e.g. NXquadrupole_magnet).

Any thoughts would be welcomed.

Sincerely,
--


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Fernan Saiz, PhD
Scientific Data Management Engineering - Computing Division
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