MS values in levelsplot

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friedrich95
Newbie
Posts: 1
Joined: Thu Aug 01, 2024 6:21 am

MS values in levelsplot

Post by friedrich95 »

Hello,
is there an easy way to assign the MS levels to the energy levels that are plottet in the levelsplot?

Thank you very much

Stefan Stoll
EasySpin Creator
Posts: 1106
Joined: Mon Jul 21, 2014 10:11 pm
Location: University of Washington

Re: MS values in levelsplot

Post by Stefan Stoll »

Not directly, but it is possible to color the levels by their |mS| value, i.e. the magnitude of the expectation value of the spin operator S_zL, where zL is the lab z axis along the magnetic field.

For this, use the option Opt.SlopeColor = true.

Here is an example:

Code: Select all

clear, clc

Sys.S = 7/2;
Sys.D = 1000;

Opt.SlopeColor = true;
levelsplot(Sys,'xy',[0 300],[],Opt);
thanasis
Local Expert
Posts: 253
Joined: Thu Jan 21, 2016 6:28 am
Location: Strasbourg

Re: MS values in levelsplot

Post by thanasis »

That's a really nice addition!

Is there a way to define a custom color palette for the various ms values?

Thanks,

Thanasis

Stefan Stoll
EasySpin Creator
Posts: 1106
Joined: Mon Jul 21, 2014 10:11 pm
Location: University of Washington

Re: MS values in levelsplot

Post by Stefan Stoll »

Unfortunately no. The color is hard-wired. You could change it manually after using get(gca,'Children'), but that's probably quite tedious.

thanasis
Local Expert
Posts: 253
Joined: Thu Jan 21, 2016 6:28 am
Location: Strasbourg

Re: MS values in levelsplot

Post by thanasis »

Thanks for this Stefan.

In levelsplot, line 197 I changed:

Code: Select all

 colormap(flipud(parula)); -->   colormap(flipud(Opt.ColorMap));

and I gave a new option when I invoke the command:

Code: Select all

Opt.ColorMap = jet;

The only workaround I needed when doing this was to copy letter2vec.m from private to the functions directory (for some reason it needed that particular function and could not find it, even after an easyspin compile).
The result is as expected for the jet color palette:

Selection_574.png
Selection_574.png (18.88 KiB) Viewed 5813 times

Would that be compatible to permanently include in the levelsplot code?

All the best

Stefan Stoll
EasySpin Creator
Posts: 1106
Joined: Mon Jul 21, 2014 10:11 pm
Location: University of Washington

Re: MS values in levelsplot

Post by Stefan Stoll »

This looks like a reasonable addition. Could you please prepare a PR for this on GitHub?

thanasis
Local Expert
Posts: 253
Joined: Thu Jan 21, 2016 6:28 am
Location: Strasbourg

Re: MS values in levelsplot

Post by thanasis »

OK, but I am a git novice: if I understand, I either need to be invited as collaborator to your repo, or fork it and work on my fork. If so, which of the two do you suggest?

Stefan Stoll
EasySpin Creator
Posts: 1106
Joined: Mon Jul 21, 2014 10:11 pm
Location: University of Washington

Re: MS values in levelsplot

Post by Stefan Stoll »

Fork the repo, make a branch in your fork, and then make a PR from your fork/branch to the main branch of EasySpin.

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