exspy.data#

EDS_SEM_TM002()

Load an EDS-SEM spectrum of a EDS-TM002 standard supplied by the Bundesanstalt für Materialforschung und -prüfung (BAM).

EDS_TEM_FePt_nanoparticles()

Load an EDS-TEM spectrum of FePt bimetallic nanoparticles.

EELS_low_loss([add_noise, random_state, ...])

Get an artificial low loss electron energy loss spectrum.

EELS_MnFe([add_powerlaw, add_noise, ...])

Get an artificial core loss electron energy loss spectrum.

eelsdb([spectrum_type, title, author, ...])

Download spectra from the EELS Data Base.

exspy.data.EDS_SEM_TM002()#

Load an EDS-SEM spectrum of a EDS-TM002 standard supplied by the Bundesanstalt für Materialforschung und -prüfung (BAM). The sample consists of an approximately 6 µm thick layer containing the elements C, Al, Mn, Cu and Zr on a silicon substrate.

Notes

  • Sample: EDS-TM002 provided by BAM (www.webshop.bam.de)

  • SEM Microscope: Nvision40 Carl Zeiss

  • EDS Detector: X-max 80 from Oxford Instrument

exspy.data.EDS_TEM_FePt_nanoparticles()#

Load an EDS-TEM spectrum of FePt bimetallic nanoparticles.

Notes

  • TEM Microscope: Tecnai Osiris 200 kV D658 AnalyticalTwin

  • EDS Detector: Super-X 4 detectors Brucker

exspy.data.EELS_MnFe(add_powerlaw=True, add_noise=True, random_state=None, navigation_shape=(10,))#

Get an artificial core loss electron energy loss spectrum.

Similar to a Mn-L32 edge from a perovskite oxide.

Some random noise is also added to the spectrum, to simulate experimental noise.

Parameters:
  • add_powerlaw (bool) – If True, adds a powerlaw background to the spectrum. Default is False.

  • add_noise (bool) – If True, add noise to the signal. See note to seed the noise to generate reproducible noise.

  • random_state (None or int or RandomState instance, default None) – Random seed used to generate the data.

  • navigation_shape (tuple) – The shape of the navigation space. Must be of length 1.

Return type:

EELSSpectrum

Example

>>> import exspy
>>> s = exspy.data.EELS_Mn()
>>> s.plot()

With the powerlaw background

>>> s = exspy.data.EELS_Mn(add_powerlaw=True)
>>> s.plot()

See also

EELS_low_loss

exspy.data.EELS_low_loss(add_noise=True, random_state=None, navigation_shape=(10,))#

Get an artificial low loss electron energy loss spectrum.

The zero loss peak is offset by 4.1 eV.

Parameters:
  • add_noise (bool) – If True, add noise to the signal. See note to seed the noise to generate reproducible noise.

  • random_state (None or int or RandomState instance, default None) – Random seed used to generate the data.

  • navigation_shape (tuple) – The shape of the navigation space.

Return type:

EELSSpectrum

Example

>>> s = exspy.data.low_loss(navigation_shape=(10, 10))
>>> s.plot()

See also

EELS_MnFe

exspy.data.eelsdb(spectrum_type=None, title=None, author=None, element=None, formula=None, edge=None, min_energy=None, max_energy=None, resolution=None, min_energy_compare='gt', max_energy_compare='lt', resolution_compare='lt', max_n=-1, monochromated=None, order=None, order_direction='ASC', verify_certificate=True, show_progressbar=None)#

Download spectra from the EELS Data Base.

Parameters:
  • spectrum_type ({'coreloss', 'lowloss', 'zeroloss', 'xrayabs'}, optional) –

  • title (string) – Search spectra titles for a text string.

  • author (string, optional) – Search authors for a text string.

  • element (string or list of strings, optional) – Filter for the presence of one or more element. Each string must correspond with a valid element symbol.

  • formula (string) – Chemical formula of the sample.

  • edge ({'K', 'L1', 'L2,3', 'M2,3', 'M4,5', 'N2,3', 'N4,5' 'O2,3', 'O4,5'}, optional) – Filter for spectra with a specific class of edge.

  • min_energy (float, optional) – Minimum and maximum energy in eV.

  • max_energy (float, optional) – Minimum and maximum energy in eV.

  • resolution (float, optional) – Energy resolution in eV.

  • resolution_compare ({"lt", "eq", "gt"}, optional, default "lt") – “lt” to search for all spectra with resolution less than resolution. “eq” for equal, “gt” for greater than.

  • min_energy_compare ({"lt", "eq", "gt"}, optional) – “lt” to search for all spectra with min/max energy less than min_energy`max_energy`. “eq” for equal, “gt” for greater than. Deafault values are “gt”/”lt” for min_energy`max_energy` respectively.

  • max_energy_compare ({"lt", "eq", "gt"}, optional) – “lt” to search for all spectra with min/max energy less than min_energy`max_energy`. “eq” for equal, “gt” for greater than. Deafault values are “gt”/”lt” for min_energy`max_energy` respectively.

  • monochromated (bool or None (default)) –

  • max_n (int, default -1) – Maximum number of spectra to return. -1 to return all.

  • order (string) – Key to sort results by. Valid keys are: * “spectrumType”, * “spectrumMin”, * “spectrumMax”, * “stepSize”, * “spectrumFormula”, * “spectrumElement”, * “spectrumUpload”, * “source_purity”, * “spectrumEdges”, * “microscope”, * “guntype”, * “beamenergy”, * “resolution”, * “monochromated”, * “acquisition_mode”, * “convergence”, * “collection”, * “probesize”, * “beamcurrent”, * “integratetime”, * “readouts”, * “detector”, * “darkcurrent”, * “gainvariation”, * “calibration”, * “zeroloss_deconv”, * “thickness”, * “deconv_fourier_log”, * “deconv_fourier_ratio”, * “deconv_stephens_deconvolution”, * “deconv_richardson_lucy”, * “deconv_maximum_entropy”, * “deconv_other”, * “assoc_spectra”, * “ref_freetext”, * “ref_doi”, * “ref_url”, * “ref_authors”, * “ref_journal”, * “ref_volume”, * “ref_issue”, * “ref_page”, * “ref_year”, * “ref_title”, * “otherURLs”

  • order_direction ({"ASC", "DESC"}) – Sorting order direction.

  • verify_certificate (bool) – If True, verify the eelsdb website certificate and raise an error if it is invalid. If False, continue querying the database if the certificate is invalid. (This is a potential security risk.)

  • show_progressbar (None or bool) – If True, display a progress bar. If None, the default from the preferences settings is used.

Returns:

spectra – A list containing all the spectra matching the given criteria if any.

Return type:

list