EXPERIMENTAL STATION 5-4

CURRENT STATUS:	Open
SUPPORTED TECHNIQUES:	Very High Energy Resolution; Photoemission Angle-Resolved Photoelectron Spectroscopy
MAIN SCIENTIFIC DISCIPLINES:	Materials
% TIME GENERAL USE:	100%
SCHEDULING:	see Proposal Submittal and Scheduling Procedures
SOURCE:	10-period undulator, maximum field 0.61 T
BEAM LINE SPECIFICATIONS:   energy range grating type resolution DE/E spot size flux angular acceptance focused 7-40 eV 1700 l/mm: 7-18 eV, E/DE > 10000 2800 l/mm: 16-32 eV, E/DE> 10000 3600 l/mm: 20-40 eV, E/DE> 10000 ≥1 x 10-4 0.5 x  0.6 mm2 ~1011 >1.5 mrad
OPTICS:	M0: horizontal deflecting, flat, water-cooled M1: vertical focusing 10:1, elliptically cylinder M3: horizontal refocusing 1:1, cylinder M4: vertical refocusing 1:1, cylinder
MONOCHROMATOR:	Normal Incidence Monochromator (NIM)
ABSORPTION:	NA
INSTRUMENTATION:	SCIENTA R4000 Electron Analyzer Low-temperature Manipulator Low Energy Electron Diffraction
DATA ACQUISITION AND ANALYSIS:	SCIENTA
RESPONSIBLE STAFF:	Donghui Lu, 650-926-3026
BEAM LINE PHONE NUMBER:	650-926-5254
GENERAL DESCRIPTION:	The BL5-4 station is a normal incidence monochromator beam line optimized for high-resolution angle-resolved photoemission spectroscopy (ARPES) in the photon energy range of 10-40 eV. The dedicated experimental end station is equipped with a SCIENTA R4000 electron spectrometer operating in the parallel multi-angle recording mode. In conjunction with the normal incidence monochromator, this system is capable of performing ARPES experiments with a total energy resolution of a few meV and an angular resolution of 0.3°. The experimental end station consists of two chambers: a sample preparation chamber together with LEED and a spectroscopy analysis chamber. Both chambers are kept under UHV throughout the experiments with a base pressure better than 3x10-11 torr. It is also equipped with a low-temperature sample manipulator with two degree of freedom of rotation, which can be cooled down to 10 K.
SCIENTIFIC APPLICATIONS / SELECTED RESULTS:	July 2008: New Mechanism Identified for Charge Density Wave Formations January 2008: Unique SSRL-Stanford Collaboratioan Illuminates Rare Materials November 2007: Bridging the Gaps of High-Tc Superconductor January 2007: Pseudogap and Superconducting Gap in High-Temperature Superconductors March 2005: From Mott Insulator to High-Tc Superconductor See Review Paper "Photoemission spectroscopy - from early days to recent applications, New Journal of Physics 2005 July 2001: Complex Materials Research by Angle-Resolved Photoemission Spectroscopy
ENGINEERING NOTES:	http://www-ssrl.slac.stanford.edu/beamlines/BL5-4/BL5-4_engr_notes.pdf http://www-ssrl.slac.stanford.edu/safety/ beamlines/bl5/

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Last Updated:	22 APR 2008
Content Owner:	Donghui Lu
Page Editor:	Nikola Stojanovic