National Synchrotron Light Source

Technique(s)
X-ray absorption spectroscopy (XAS, XAFS)
X-ray absorption spectroscopy, extended fine structure (EXAFS)
X-ray absorption spectroscopy, near edge x-ray absorption (NEXAFS, XANES)

PRT Institution(s)
Brookhaven National Laboratory, Chemistry Department
Brookhaven National Laboratory, Nat. Sync. Light Source
Chevron Research & Technology Company
General Electric
North Carolina State University
Rutgers University
UOP
University of Kentucky

Research Types
Physics, Materials Science, Chemistry, Environmental Science, Geology, Biology

Research Examples
x-ray absorption spectroscopy

Status
Operational

General User Beamtime
50%

Energy Range Category
Hard X-Ray (1-50 keV)

Energy Range
5.7-40 keV

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.

Wolfgang Caliebe, Brookhaven National Laboratory, 631-344-4744

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.

Syed Khalid, Brookhaven National Laboratory, 631-344-7496

Wolfgang Caliebe, Brookhaven National Laboratory, 631-344-4744

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

Syed Khalid, Brookhaven National Laboratory, 631-344-7496

Beamline Phone
631-344-5718

External Homepage
http://www.nsls.bnl.gov/beamlines/x18b/exafs.htm

Beamline Characteristics

Energy Range (keV)	Crystal type	Flux (photons/sec)	Resolution (deltaE/E)	Spot Size (mm)	Total Angular Acceptance (mradians)
5.7-40	Si (111)	1.0 x 10¹⁰ @ 8 keV	2 x 10E^-4	25.0H x 1.5V	1.0

Beamline Optical System

Monochromator
Si(111) channel cut monochromator with detuning and some deglitching capabilities. Beam walk < few microns during typical scan. Monochromator in ultra high vacuum 18 m from the source. Sample at ~20 m from the source.0.1,0.2,0.3,0.5,1.0 and 1.5 mm vertical slits at ~17 m from the source.

Experimental Appararus
Radiation hutch with exhaust system for toxic emissions; ion chambers; fluorescence detectors(PIPS, Lytle and 13-element Ge detector); multi-channel analyzer; x-y stage sample positioner.

Computer System Hardware & Software
1 GHz Pentium to run the beamline and data collection. CAMAC and GPIB interface with Lab View for programming. Another Pentium with FEFFIT, Athena, Artemis WinXAS and BAN for data analysis. 100 MB iomega Zip drives, CD burners and Laser printers etc.

Flange Lock Checklist

Vaccuum Procedure

Safety Check List

BLOSA Training

http://www.nsls.bnl.gov/organization/ESH/QA/beamlines.htm

Beamline X18B