hyperspy._components.eels_cl_edge module

class hyperspy._components.eels_cl_edge.EELSCLEdge(element_subshell, GOS=None)

Bases: Component

EELS core loss ionisation edge from hydrogenic or tabulated Hartree-Slater GOS with splines for fine structure fitting.

Hydrogenic GOS are limited to K and L shells.

Currently it only supports Peter Rez’s Hartree Slater cross sections parametrised as distributed by Gatan in their Digital Micrograph (DM) software. If Digital Micrograph is installed in the system HyperSpy in the standard location HyperSpy should find the path to the HS GOS folder. Otherwise, the location of the folder can be defined in HyperSpy preferences, which can be done through hs.preferences.gui() or the hs.preferences.EELS.eels_gos_files_path variable.

Parameters:

  • element_subshell ({str, dict}) – Usually a string, for example, ‘Ti_L3’ for the GOS of the titanium L3 subshell. If a dictionary is passed, it is assumed that Hartree Slater GOS was exported using GOS.as_dictionary, and will be reconstructed.

  • GOS ({'hydrogenic', 'Hartree-Slater', None}) – The GOS to use. If None it will use the Hartree-Slater GOS if they are available, otherwise it will use the hydrogenic GOS.

onset_energy

The edge onset position

Type:

Parameter

intensity

The factor by which the cross section is multiplied, what in favourable cases is proportional to the number of atoms of the element. It is a component.Parameter instance. It is fixed by default.

Type:

Parameter

fine_structure_coeff

The coefficients of the spline that fits the fine structure. Fix this parameter to fix the fine structure. It is a component.Parameter instance.

Type:

Parameter

effective_angle

The effective collection semi-angle. It is automatically calculated by set_microscope_parameters. It is a component.Parameter instance. It is fixed by default.

Type:

Parameter

fine_structure_smoothing

Controls the level of smoothing of the fine structure model. Decreasing the value increases the level of smoothing.

Type:

float between 0 and 1

fine_structure_active

Activates/deactivates the fine structure feature.

Type:

bool

function(E)

Returns the number of counts in barns

get_fine_structure_as_signal1D()

Returns a spectrum containing the fine structure.

Notes

The fine structure is corrected from multiple scattering if the model was convolved with a low-loss spectrum

gui(display=True, toolkit=None, **kwargs)

Display or return interactive GUI element if available.

Parameters:

  • display (bool) – If True, display the user interface widgets. If False, return the widgets container in a dictionary, usually for customisation or testing.

  • toolkit (str, iterable of strings or None) – If None (default), all available widgets are displayed or returned. If string, only the widgets of the selected toolkit are displayed if available. If an interable of toolkit strings, the widgets of all listed toolkits are displayed or returned.

set_microscope_parameters(E0, alpha, beta, energy_scale)
Parameters:

  • E0 (float) – Electron beam energy in keV.

  • alpha (float) – Convergence semi-angle in mrad.

  • beta (float) – Collection semi-angle in mrad.

  • energy_scale (float) – The energy step in eV.