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Performance of the Grating-Crystal Monochromator of the ALOISA beamline at the Elettra Synchrotron (Articolo in rivista)

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Performance of the Grating-Crystal Monochromator of the ALOISA beamline at the Elettra Synchrotron (Articolo in rivista) (literal)

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L. Floreano1, G. Naletto2, D. Cvetko3, R. Gotter1, M. Malvezzi4, L. Marassi5, A. Morgante1, A. Santaniello3, A. Verdini1, F. Tommasini1, and G. Tondello6 (1999)
Performance of the Grating-Crystal Monochromator of the ALOISA beamline at the Elettra Synchrotron
in Review of scientific instruments; American Institute of Physics, Woodbury [NY] (Stati Uniti d'America)
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L. Floreano1, G. Naletto2, D. Cvetko3, R. Gotter1, M. Malvezzi4, L. Marassi5, A. Morgante1, A. Santaniello3, A. Verdini1, F. Tommasini1, and G. Tondello6 (literal)

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1Laboratorio TASC dell'Istituto Nazionale per la Fisica della Materia, Padriciano 99, I-34012 Trieste, Italy 2Department of Electronics and Informatics, University of Padova, INFM--Unit of Padova, Via Gradenigo 6/A, I-35131 Padova, Italy 3Sincrotrone Trieste, Padriciano 99, I-34012 Trieste, Italy 4Department of Electronics, University of Pavia, Via Ferrata 1, I-27100 Pavia, Italy 5Department of Physics, University of Modena, Via Campi 213a, I-41100 Modena, Italy 6Department of Electronics and Informatics, University of Padova, INFM-Unit of Padova, via Gradenigo 6, I-35131 Padova, Italy (literal)

Titolo

Performance of the Grating-Crystal Monochromator of the ALOISA beamline at the Elettra Synchrotron (literal)

Abstract

The new beamline ALOISA, now operational at the Elettra Synchrotron, is designed for surface studies by means of several experimental techniques: surface x-ray diffraction and reflectivity, photoemission spectroscopy, photoelectron diffraction, e(-)-Auger coincidence spectroscopy. A new monochromator has been specifically designed and realized for this multipurpose beamline: it makes use of a channel-cut Si crystal dispersive element for the 3-8 keV range and of a plane mirror-plane grating element for the 200-2000 eV range. Both dispersive elements share the same optical system. In the low energy range (200-900 eV) the spectral resolving power exceeds 5000 while maintaining a throughput higher than 10(10) photons/s/200 mA/0.02% BW. In the case of the N-2 1s -->pi* and Ne 1s --> 3p transitions, the extremely high signal-to-noise ratio of the absorption spectra allowed a very accurate determination of the corresponding natural linewidth (116 +/- 2 and 250 +/- 10 eV, respectively). Moreover, the vibrational structure of the CO-oxygen 1s -->pi(*) transition has been fully resolved. In the high energy range, the measured flux exceeds 10(10) photons/s/200 mA up to 6.5 keV with a resolving power of similar to 7500. (literal)

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