2nd order quadrupolar in SPINACH

[faq_user]

I was wondering how to implemented a simple 2nd order quadrupolar simulation on say 23Na (under static conditions). I do not know how to turn on the second-order quadrupolar terms and secondly, i need to detection state to be the central transition. I am unsure on how to implement this. All examples features quadrupolar simulations are done on I=1 nuclei.

[kuprov]

Already implemented - set assumptions to labframe, then specify parameters.rframes field when you call the powder context. As for the central transition -- find its operator expansion and set parameters.coil accordingly.