HIS 13 High Intensity VUV Source - OMICRON - #1

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Omicron NanoTechnology GmbH www.omicron.de • Photon flux > 1016 photons/s · sr • Small beam divergence (< ± 1°) • Excellent HeÉÉ/HeÉ ratio • Piezo ignition for easy operation • Viewport for discharge control • Low maintenance & safe operation Ph t fl h t / HIS 13 High Intensity VUV Source Toroidal focusing mirror for small spot size at long working distance and ARUPS applications Continuously rotatable linear polariser for full exploitation of symmetry selection rules in photoemission HIS 13 VUV source The HIS 13 vacuum ultraviolet source achieves very high intensities by integrating a high voltage anode into the self-centring discharge capillary (Ref. 1). A clean capillary - a prerequisite for both stability with high photon fluxes and long equipment lifetime - is maintained by means of continuous gas flow through the discharge region and optimised differential pumping. Water cooling prevents the lamp from heating up, reduces maintanance and allows discharge currents up to 300 mA. Flexibility for different applications is provided by a choice of capillary diameters, and by the linear polarizer and toroidal focusing mirror options. For high resolution the HIS 13’s line width can be tuned, here it was <2 meV. ..E = 3.36 meV FWHM Kinetic Energy [eV] Intensity [arb. units] Gas Phase UPS (NeI) Xe 5p3/2 90 60 30 0 4.590 4.600 4.610 4.620 Solid state HRUPS on the Ag Fermi edge, T=10 K. Contributions of ca. .. 3 meV from the HIS 13 and 3.4 meV (FWHM) sample thermal broadening. 16.78 16.80 16.82 16.84 16.86 16.88 -0.04 -0.02 EF=0 0.02 0.04 4000 3000 2000 1000 0 Intensity [arb. units] Kinetic Energy [eV] Ag foil T = 10 K High intensity gives better resolution: shown the HIS 13’s line width <2 meV. A monochromator is thus redundant for most applications. He.. He.... Cu He..../He.. = 1:2 3•105 2•105 105 0 5 10 15 20 25 30 35 40 45 50 N[E] [counts/s] Kinetic Energy [eV] Ref. 1: G. Schönhense, U. Heinzmann, J. Phys. E16, 74 (1983) HIS13 630-V04/Mar.08