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Beamline U1A

General Information

Source Type
Bending Magnet

Status
Diagnostic and Instrumentation

General User Beamtime
25%

Energy Range Category
Soft X-Ray (0.1-1 keV)

Energy Range
270-900 eV

Beamline Type
Participating Research Team (PRT)

Technique(s)
X-ray absorption spectroscopy
X-ray absorption spectroscopy, fine structure
X-ray absorption spectroscopy, near edge fine structure
X-ray absorption spectroscopy, near edge structure

Institution(s)
ExxonMobil Research and Engineering Co.

Research Types
NEXAFS characterization of catalytic materials and fundamental studies of surface chemistry on model systems.

Contact Information

Spokesperson The person from each beamline who acts as a contact point between the beamline management and NSLS administration. Contact for questions about the beamline scientific program, experimental capabilities, and beamline management.
Steven Hulbert, Brookhaven National Laboratory, hulbert@bnl.gov, 344-7570

Local Contact The beamline staff member who is typically responsible for overseeing the daily operation and maintenance of the beamline. Contact for questions about beamline instrumentation, experimental details, and training.
Qing-Yi Dong, Brookhaven National Laboratory, qdong@bnl.gov, 344-5358

Beamtime Scheduler The beamline staff member responsible for coordination of beamline schedule every trimester. Contact for questions about beamtime scheduling.

Beamline Phone
631-344-5501

Instrumentation

Beamline Characteristics

Energy Range Mono Crystal or Grating Resolution (ΔE/E) Flux Spot Size (mm) Total Angular Acceptance (mrad)
8 – 46 1200 lines/mm = 0.02   2.0H x 1.0V 15.0H x 1.0V
8 – 89 800 lines/mm = 0.04   2.0H x 1.0V 15.0H x 1.0V
65 - 500 600 lines/mm = 0.09   2.0H x 1.0V 15.0H x 1.0V

Source Type
Bending magnet

Optical System
Mirror 1: Bent flat Zerodur mirror coated with 1000 of platinum, horizontal collection of beam, 3 degree grazing angle of incidence. Located 2.8 meters from source.

Monochromator: Extended Range Grasshopper, uses Rowland circle geometry with fixed exit geometry. The optical layout consists of a gold-coated bent elliptical vertical focusing mirror, a Codling mirror/entrance slit combination, three spherical gold-coated gratings interchangeable in-situ in UHV, and an exit slit. The entrance and exit slits allow adjustment of monochromator resolution independent of beam source size. The exit slit is located 5.6 meters from source.

Mirror 2: Refocusing mirror: bent cylindrical aluminum mirror coated with electroless nickel and 1000 of gold at 2.5 degree grazing angle of incidence, providing horizontal and vertical focusing of beam. Located 7.8 meters from source.

Experimental Apparatus
Ultra-high vacuum sample chamber configured for photoemission, photoabsorption, and surface characterization experiments.

Computer System Hardware & Software
U1A is supported by a VAX/VMS system interfaced to a standard CAMAC bus using a KS-3922 controller. A software package SPECTR provides required experimental control and plotting needs.

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