User-Friendly End Station at the ALS for Nanostructure Characterization

Technical Report · Wed Jul 05 00:00:00 EDT 2006

DOI:https://doi.org/10.2172/896224· OSTI ID:896224

Himpsel, F J; Alivisatos, P; Callcott, T; Carlisle, J; Denlinger, J D; Eastman, D E; Ederer, D; Hussain, Z; Terminello, L J; Buuren, T Van; Williams, R S

This is a construction project for an end station at the ALS, which is optimized for measuring NEXAFS of nanostructures with fluorescence detection. Compared to the usual electron yield detection, fluorescence is able to probe buried structures and is sensitive to dilute species, such as nanostructures supported on a substrate. Since the quantum yield for fluorescence is 10{sup -4}-10{sup -5} times smaller than for electrons in the soft x-ray regime, such an end station requires bright undulator beamlines at the ALS. In order to optimize the setup for a wide range of applications, two end stations were built: (1) A simple, mobile chamber with efficient photon detection (>10{sup 4} times the solid angle collection of fluorescence spectrographs) and a built-in magnet for MCD measurements at EPU beamlines (Fig. 1 left). It allows rapid mapping the electronic states of nanostructures (nanocrystals, nanowires, tailored magnetic materials, buried interfaces, biologically-functionalized surfaces). It was used with BL 8.0 (linear polarized undulator) and BL 4.0 (variable polarization). (2) A sophisticated, stationary end station operating at Beamline 8.0 (Fig. 1 right). It contains an array of surface characterization instruments and a micro-focus capability for scanning across graded samples (wedges for thickness variation, stoichiometry gradients, and general variations of the sample preparation conditions for optimizing nanostructures).

• Research Organization: University of Wisconsin Madison
• Sponsoring Organization: USDOE - Office of Energy Research (ER)
• DOE Contract Number: FG02-01ER45917
• OSTI ID: 896224
• Report Number(s): DOE/ER/45917; TRN: US0702193
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
43 PARTICLE ACCELERATORS
47 OTHER INSTRUMENTATION
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CONSTRUCTION
DETECTION
ELECTRONS
FLUORESCENCE
MAGNETIC MATERIALS
MAGNETS
NANOSTRUCTURES
PHOTONS
POLARIZATION
PROBES
SAMPLE PREPARATION
STOICHIOMETRY
THICKNESS
WIGGLER MAGNETS
Synchrotron Radiation
X-ray Absorption Spectroscopy
Nanoscience
Advanced Light Source (ALS)