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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Experimental setup for low-energy laser-based angle resolved photoemission spectroscopy.

J D Koralek1, J F Douglas, N C Plumb

  • 1Department of Physics, University of Colorado, Boulder, CO 80309-0390, USA.

The Review of Scientific Instruments
|June 8, 2007
PubMed
Summary

A new angle-resolved photoemission spectroscopy (ARPES) system uses low-energy photons for enhanced momentum resolution and faster data collection. This technique offers improved surface sensitivity for studying superconductors like Bi2212.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Angle-resolved photoemission spectroscopy (ARPES) is a powerful technique for probing electronic structures.
  • Higher photon energies in ARPES can lead to increased surface sensitivity and background noise.
  • Understanding high-temperature superconductors requires precise electronic structure measurements.

Purpose of the Study:

  • To describe a novel laser-based ARPES system utilizing low-energy (6 eV) photons.
  • To highlight the advantages of this system for momentum resolution and count rate.
  • To discuss experimental considerations and calibration for low-energy ARPES.

Main Methods:

  • Utilized a mode-locked Ti:sapphire oscillator to generate 6 eV photons (fourth harmonic).
  • Developed and described the optical system for the low-energy ARPES setup.
  • Calibrated a hemispherical electron analyzer for optimal low-energy angle-mode performance.

Main Results:

  • The 6 eV photon source significantly enhances momentum resolution and photoelectron count rate.
  • Reduced extrinsic background and surface sensitivity compared to higher photon energies.
  • Demonstrated the system's capability by comparing data from Bi2212 with higher photon energy results.

Conclusions:

  • The developed low-energy ARPES system offers superior performance for electronic structure studies.
  • This technique provides a valuable tool for investigating complex materials like high-Tc superconductors.
  • The findings pave the way for more detailed investigations into material properties using ARPES.