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Updated: May 1, 2026
08:53
Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
Published on: October 9, 2012
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Tunable vacuum ultraviolet laser based spectrometer for angle resolved photoemission spectroscopy
Rui Jiang1, Daixiang Mou1, Yun Wu1
1Division of Materials Science and Engineering, Ames Laboratory, Ames, Iowa 50011, USA.
The Review of Scientific Instruments
|April 3, 2014
Summary
Researchers developed a tunable vacuum ultraviolet laser for angle-resolved photoemission spectroscopy. This new method enables detailed analysis of high-temperature superconductors, previously requiring large synchrotron facilities.
Area of Science:
- Physics
- Materials Science
- Spectroscopy
Background:
- Angle-resolved photoemission spectroscopy (ARPES) is crucial for understanding electronic structures.
- Previous ARPES studies of superconductors often required large-scale synchrotron radiation facilities.
Purpose of the Study:
- To develop a compact, tunable vacuum ultraviolet (VUV) laser source for ARPES.
- To enable high-resolution electronic structure measurements outside of synchrotron facilities.
Main Methods:
- Utilized fourth harmonic generation of a Ti:sapphire laser to create a tunable VUV photon source (5.3-7 eV).
- Employed a compact, vacuum-enclosed fourth harmonic generator with hydrothermally grown potassium beryllium fluoroborate crystals.
- Achieved a photon flux exceeding 10^14 photons/s.
Main Results:
- Demonstrated the VUV laser source's capability for ARPES measurements.
- Successfully measured the k(z) dispersion in an iron arsenic high-temperature superconductor.
- Showcased the potential for detailed electronic structure analysis of materials.
Conclusions:
- The developed VUV laser system provides a viable, lab-based alternative to synchrotrons for ARPES.
- This advancement facilitates accessible and in-depth studies of complex materials like high-temperature superconductors.
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