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Photoemission with high-order harmonics: A tool for time-resolved core-level spectroscopy

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Authors:
  • Christensen, Bjarke Holl ;
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  • Raarup, Merete Krog ;
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  • Balling, Peter
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DOI:
10.1016/j.nima.2009.12.078
Abstract:
A setup for femtosecond time-resolved photoelectron spectroscopy of solid surfaces is presented. The photon energies for core-level spectroscopy experiments are created by high-order harmonic generation from infrared 120-femtosecond laser pulses focused in a Ne gas jet. The present experimental realization allows the sample, located in an ultrahigh-vacuum chamber, to be illuminated by 106 65-eV photons per laser pulse at a 10 Hz repetition rate. The spectral width of a single harmonic is 0.77 eV (FWHM), and a few harmonics are selected by specially designed Mo/Si multi-layer mirrors. Photoelectrons from the sample are collected by a large-solid-angle time-of-flight electron spectrometer based on a parabolic-grid reflector. Results from experiments probing the Bi 5d core-levels are presented, and the results of preliminary pump-probe experiments are described.
Type:
Journal article
Language:
English
Published in:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2010, Vol 615, Issue 1, p. 114-126
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2010
Scientific Level:
Scientific
ID:
1121549

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