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Helium

Core loss He · Odile Stephan · added 2008-02-25 · Beam energy and angles known · History

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He K line (1s -> 2p) from a pressured He bubble formed in a tritiated PdPt matrix. The energy of the K line depends on the pressure (here 22 eV at 0.1 Gpa) . It has to be compared to the value for an isolated atom: 21.218 eV. The 1s->3p transition is also visible in the spectrum at 23.8 eV See paper for details Analyst: Odile Stephan,Dario Taverna. Temperature: Room.

Use in HyperSpy
import exspy

spectra = exspy.data.eelsdb(title="Helium", formula="He")
s = next(sp for sp in spectra if sp.original_metadata.json.id == 21731)
s.plot(plot_edges=True)

Specimen

Formula
He
Elements
He
Edges
He K
Source and purity
19.5 nm Helium bubble in an aged tritiated Pd90Pt10 matrix
Energy range
14.98 – 32.93 eV
Step
0.048 eV

Keywords

  • imported from old site

Treatment

Dark current corrected
Yes
Gain variation corrected
No

Acquisition

Microscope
STEM-VG
Gun
Cold FEG
Beam energy
100 kV
Convergence semi-angle
15 mrad
Collection semi-angle
24 mrad
Resolution
0.7 eV
Mode
STEM
Detector
Parallel: 666 Gatan
Probe size
1 nm²
Integration time
0.2 s
Readouts
50

Reference

S. Taverna, M. Kocia, O.Stephan et al., PRL, 100, 035301, 2008

Other links

Please cite this spectrum

If you use this spectrum, cite the contributor's paper and the EELS Data Base.

Odile Stephan. Helium (He). EELS Data Base, spectrum 21731, 2008. https://eelsdb.eu/spectra/helium/

S. Taverna, M. Kocia, O.Stephan et al., PRL, 100, 035301, 2008

Philip Ewels, Thierry Sikora, Virginie Serin, Chris P. Ewels and Luc Lajaunie. “A Complete Overhaul of the Electron Energy-Loss Spectroscopy and X-Ray Absorption Spectroscopy Database: eelsdb.eu.” Microscopy and Microanalysis 22, 717–724 (2016). doi:10.1017/S1431927616000179
BibTeX
@misc{Stephan2008eelsdb21731,
  author = {Odile Stephan},
  title = {Helium},
  howpublished = {EELS Data Base, spectrum 21731},
  year = {2008},
  url = {https://eelsdb.eu/spectra/helium/}
}

@article{ewels2016eelsdb,
  author = {Ewels, Philip and Sikora, Thierry and Serin, Virginie and Ewels, Chris P. and Lajaunie, Luc},
  title = {A Complete Overhaul of the Electron Energy-Loss Spectroscopy and X-Ray Absorption Spectroscopy Database: eelsdb.eu},
  journal = {Microscopy and Microanalysis},
  volume = {22},
  pages = {717--724},
  year = {2016},
  doi = {10.1017/S1431927616000179}
}
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