Add new application definition for PEEM experiments

[PeterC-DLS]

This extends NXmpes and adds some new groups and fields and also adjusts some existing fields' classes

[domna]

Hey @PeterC-DLS,

thank you for your proposal. I left some comments in the yaml file.

[domna]

Hey @PeterC-DLS,

I just wanted to let you know that we started to add an additional level on top of NXmpes: NXphotoemission. See #74 for further details.
Our idea was that NXmpes should contain an energy axis since we say it is a spectroscopy and that we have other techniques (like PEEM) that do not necessarily have an energy axis. Therefore, we moved all of the fields of NXmpes into NXphotoemission and you might just use NXphotoemission as a drop-in replacement for NXmpes in the future. We will, however, may move some fields from NXphotoemission to NXmpes if we think they rather are spectroscopic properties (but I think this will not be of much concern for NXpeem either).

Other than this: Can I help you with anything to finalise this PR? Are there currently any open points/blockers for you?

[PeterC-DLS]

Thanks for the update and pointer. Your PR sounds fine to me.

[domna]

Thanks for the update and pointer. Your PR sounds fine to me.

Sure and thanks.
I was also wondering about the status of this NXpeem PR. Is there anything you still like to add/change? Are there things which need discussion?

[PeterC-DLS]

I will update and rebase this PR once you have finalized or merged your refactor of NXmpes to NXphotoemission.

[domna]

@PeterC-DLS I think this auto closed due to our merge of mpes-refactor, but feel free to set the target to fairmat and re-open this PR.

We did not yet add the top-level class NXphotoemission, because we did not want to overcomplicate the definitions for our workshop next week. But it will be merged afterwards (see #74). Feel free to move forward with this or wait until we do the changes. Whatever is best for you.

[PeterC-DLS]

I have just rebase this to the old branch! But it's not a problem for me to rebase as and when NXphotoemission is ready.