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 (Deltaalpha = +/-2.7degrees) and the low angular resolution mode (Deltaalpha = +/-5.6degrees). Single photon photoemission spectra from the Ag(100) clean surface have been recorded at room temperature using the fourth harmonic light (lambda = 200 nm and hv = 6.28 eV). 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.

Paolicelli, G., Fondacaro, A., Ruocco, A., Attili, A., Stefani, G., Ferrini, G., et al. (2002). A novel apparatus for laser-excited time-resolved photoemission spectroscopy. SURFACE REVIEW AND LETTERS, 9(1), 541-547 [10.1142/S0218625X02002610].

A novel apparatus for laser-excited time-resolved photoemission spectroscopy

RUOCCO, Alessandro;
2002-01-01

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 (Deltaalpha = +/-2.7degrees) and the low angular resolution mode (Deltaalpha = +/-5.6degrees). Single photon photoemission spectra from the Ag(100) clean surface have been recorded at room temperature using the fourth harmonic light (lambda = 200 nm and hv = 6.28 eV). 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.
2002
Paolicelli, G., Fondacaro, A., Ruocco, A., Attili, A., Stefani, G., Ferrini, G., et al. (2002). A novel apparatus for laser-excited time-resolved photoemission spectroscopy. SURFACE REVIEW AND LETTERS, 9(1), 541-547 [10.1142/S0218625X02002610].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/121904
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