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A Novel Apparatus For Laser-Excited Time-Resolved Photoemission Spectroscopy

Author

Listed:
  • G. PAOLICELLI

    (INFM, Research Unit of Roma TRE, Via della Vasca Navale 84 – I 00146 Roma, Italy)

  • A. FONDACARO

    (INFM, Research Unit of Roma TRE, Via della Vasca Navale 84 – I 00146 Roma, Italy)

  • A. RUOCCO

    (INFM and Department of Physics, University of Roma TRE – I 00146 Roma, Italy)

  • A. ATTILI

    (INFM and Department of Physics, University of Roma TRE – I 00146 Roma, Italy)

  • G. STEFANI

    (INFM and Department of Physics, University of Roma TRE – I 00146 Roma, Italy)

  • G. FERRINI

    (INFM and Department of Mathematics and Physics, The Cattolica University – I 25121 Brescia, Italy)

  • M. PELOI

    (INFM and Department of Mathematics and Physics, The Cattolica University – I 25121 Brescia, Italy)

  • F. PARMIGIANI

    (INFM and Department of Mathematics and Physics, The Cattolica University – I 25121 Brescia, Italy)

  • G. BANFI

    (INFM and Department of Electronics, University of Pavia – I 27100 Pavia, Italy)

  • G. CAUTERO

    (Sincrotrone Trieste S.C.p.A – I 34012 Basovizza, Trieste, Italy)

  • R. TOMMASINI

    (Sincrotrone Trieste S.C.p.A – I 34012 Basovizza, Trieste, Italy)

  • G. COMELLI

    (INFM and Department of Physics, University of Trieste – I 34000 Trieste, Italy)

  • R. ROSEI

    (INFM and Department of Physics, University of Trieste – I 34000 Trieste, Italy)

Abstract

A novel apparatus devoted to time-resolved photoemission experiments in the sub-picosecond regime will be presented. The system is composed of a Ti:sapphire laser source and a time of flight (TOF) electron energy analyzer mounted in a UHV experimental chamber. The laser source is characterized by a pulse duration of 150 fs at a wavelength of 790 nm (1.57 eV) and operates at a repetition rate of 1 kHz. To perform photoemission measurements, UV radiation up to 6.28 eV is produced with sequential steps of frequency conversion by employing crystals with a second order nonlinearity. Photoelectrons are collected by a TOF spectrometer designed to analyze electrons from tenths of eV up to 5 eV. It can be operated in two different angular resolution modes switching on and off an electrostatic collection optics: the high angular resolution mode(Δα = ±2.7°)and the low angular resolution mode(Δα = ±5.6°). Single photon photoemission spectra from the Ag(100) clean surface have been recorded at room temperature using the fourth harmonic light (λ = 200 nm andhν = 6.28eV). The Fermi edge profile convoluted with a Gaussian-shaped energy transmission function of the TOF spectrometer sets an upper limit for the energy resolution which is about 65 meV (FWHM) at 2 eV of electron energy.

Suggested Citation

  • G. Paolicelli & A. Fondacaro & A. Ruocco & A. Attili & G. Stefani & G. Ferrini & M. Peloi & F. Parmigiani & G. Banfi & G. Cautero & R. Tommasini & G. Comelli & R. Rosei, 2002. "A Novel Apparatus For Laser-Excited Time-Resolved Photoemission Spectroscopy," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 9(01), pages 541-547.
    • Handle: RePEc:wsi:srlxxx:v:09:y:2002:i:01:n:s0218625x02002610
    DOI: 10.1142/S0218625X02002610
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