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Updated: May 21, 2025
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
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VUV polarimeter for inverse photoemission
Pascal J Grenz1, Patrick Geers1, Marcel Holtmann1
1Physikalisches Institut, Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany.
The Review of Scientific Instruments
|March 20, 2025
Summary
Researchers developed the first vacuum ultraviolet (VUV) polarimeter for angle-resolved inverse photoemission (ARIPE). This new tool enables polarization analysis of emitted light, revealing enhanced intensity for p-polarized light from Cu(111) surface states.
Area of Science:
- Surface Science
- Spectroscopy
- Materials Physics
Background:
- Angle-resolved photoelectron spectroscopy (ARPES) uses polarized light to probe electronic orbital symmetries.
- Polarization analysis in angle-resolved inverse photoemission (IPE) has been limited by low transition cross-sections and lack of VUV polarizers.
Purpose of the Study:
- To present the first vacuum ultraviolet (VUV) polarimeter for angle-resolved inverse photoemission (IPE).
- To enable polarization analysis of emitted light in IPE experiments.
- To investigate the polarization dependence of the Cu(111) L-gap surface state.
Main Methods:
- Development and testing of a VUV polarimeter utilizing a high-reflectivity polarizing mirror in Brewster-angle geometry.
- Integration of the polarimeter with established photon detectors.
- Performing IPE measurements on the Cu(111) L-gap surface state with separate detection of p- and s-polarized light.
Main Results:
- Demonstration of the first successful VUV polarimeter for IPE.
- Observation of significantly enhanced photon intensity for p-polarized light compared to s-polarized light for the Cu(111) surface state.
- Results align with polarization-dependent ARPES measurements of the occupied surface state.
Conclusions:
- The developed VUV polarimeter effectively enables polarization analysis in IPE.
- This technique provides valuable insights into electronic orbital symmetries, complementing ARPES.
- The findings validate the polarization-dependent behavior of the Cu(111) surface state.
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