title: Beamline 10.3.2 at ALS: a hard X-ray microprobe for environmental and materials sciences.
abstract: Beamline 10.3.2 at the ALS is a bend-magnet line designed mostly for work on environmental problems involving heavy-metal speciation and location. It offers a unique combination of X-ray fluorescence mapping, X-ray microspectroscopy and micro-X-ray diffraction. The optics allow the user to trade spot size for flux in a size range of 5-17 microm in an energy range of 3-17 keV. The focusing uses a Kirkpatrick-Baez mirror pair to image a variable-size virtual source onto the sample. Thus, the user can reduce the effective size of the source, thereby reducing the spot size on the sample, at the cost of flux. This decoupling from the actual source also allows for some independence from source motion. The X-ray fluorescence mapping is performed with a continuously scanning stage which avoids the time overhead incurred by step-and-repeat mapping schemes. The special features of this beamline are described, and some scientific results shown.
authors.affiliation: Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA. mamarcus@lbl.gov
authors.forename: Matthew A
authors.initials: MA
authors.lastname: Marcus
authors.forename: Alastair A
authors.initials: AA
authors.lastname: MacDowell
authors.forename: Richard
authors.initials: R
authors.lastname: Celestre
authors.forename: Alain
authors.initials: A
authors.lastname: Manceau
authors.forename: Tom
authors.initials: T
authors.lastname: Miller
authors.forename: Howard A
authors.initials: HA
authors.lastname: Padmore
authors.forename: Robert E
authors.initials: RE
authors.lastname: Sublett
mesh_terms: D017360:Arabidopsis / Q000737:chemistry; D019187:Cadmium Compounds / Q000737:chemistry; D002140:California; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D008422:Materials Testing / Q000295:instrumentation* / Q000379:methods; D008670:Metals / Q000032:analysis; D043942:Nanotubes / Q000737:chemistry / Q000648:ultrastructure; D012989:Soil Pollutants / Q000032:analysis; D013052:Spectrometry, X-Ray Emission / Q000295:instrumentation* / Q000379:methods; D013440:Sulfides / Q000737:chemistry; D018511:Systems Integration; D014159:Transducers; D014961:X-Ray Diffraction / Q000295:instrumentation* / Q000379:methods; D014965:X-Rays; D015032:Zinc / Q000032:analysis
chemical_list: D019187:Cadmium Compounds; D008670:Metals; D012989:Soil Pollutants; D013440:Sulfides; C034939:cadmium sulfide; D015032:Zinc