xarray.DataArray.kspace.set_normal¶

DataArray.kspace.set_normal(self, alpha, beta, *, delta=None)[source]¶

Set offsets from normal emission angles.

This method sets the angle offsets so that the provided normal emission angles \((\alpha, \beta)\) in the data map to \((k_x, k_y) = (0, 0)\) in momentum space.

Parameters:

alpha (float) – Angle \(\alpha\) in degrees corresponding to sample normal emission.
beta (float) – Angle \(\beta\) in degrees corresponding to sample normal emission.
delta (float | None, default: None) – Optional azimuthal offset \(\delta\) in degrees. If omitted, the existing delta offset is preserved.

Examples

>>> data.kspace.set_normal(alpha=1.2, beta=-0.4)
>>> dict(data.kspace.offsets)
{'delta': 0.0, 'xi': -1.2, 'beta': -0.4}