X18B External Website

Beamline X18B

  • General Information
    • Source Type
      Bending magnet


      General User Beamtime

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

      Energy Range
      4.7-40 keV

      Beamline Type
      Facility Beamline

      Beamline Description
      Beamline X18B is dedicated to do x-ray absorption spectroscopy, it covers the energy range 4.7 to 40 KeV. The Synchrotron Catalysis Consortium (SCC) and General User members come from different industrial, educational and government research institutions and do research in a variety of fields, i.e. chemistry, catalysis, environment, biology and solid state physics. The beamline is equipped with a 13-element Ge-detector, and a 4-element Si-drift Vortex detector. It is also possible to mount a He closed-cycle cryostat to cool the sample to 20K. These detectors are shared with X19A.

      X-ray absorption spectroscopy
      X-ray absorption spectroscopy, extended fine structure
      X-ray absorption spectroscopy, fine structure
      X-ray absorption spectroscopy, near edge fine structure
      X-ray absorption spectroscopy, near edge structure

      Brookhaven National Laboratory Chemistry
      Brookhaven National Laboratory Electrochemistry
      Pacific Northwest National Laboratory
      UOP LLC
      University of Deleware
      Yeshiva University

      Research Types
      X-ray absorption spectroscopy (XAS), and Quick-XAS in biology, chemistry, physics, geology, environmental sciences, including nanoparticles. Through SCC, temp. programmed gas treatment of samples with RGA analysis.

  • 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.
      Syed Khalid, Brookhaven National Laboratory, khalid@bnl.gov, 344-7496

      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, khalid@bnl.gov, 344-7496
      Nebojsa Marinkovic, Columbia University, marinkov@bnl.gov, 6313443808

      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, khalid@bnl.gov, 344-7496

      Beamline Phone

  • Instrumentation
    • Beamline Characteristics

      Energy RangeMono Crystal or GratingResolution (ΔE/E)FluxSpot Size (mm)Total Angular Acceptance (mrad)
      4.7 – 40 keV Si(111) 2 x 10-4 1.0 x 1010 ph/sec (@ 8 keV) 25.0H x 1.5V 1.0

      Source Type
      Bending magnet

      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 Apparatus
      Radiation hutch with exhaust system for toxic emissions; HEPA filter for nano materials, ion chambers; fluorescence detectors(PIPS, Lytle, 13-element Ge detector, 4-element Si-drift Vortex detector), multi-channel analyzer; x-z stage sample positioner. Through SCC, temperature programmed gas treatment of samples with RGA analysis.

      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 and WinXAS for data analysis. CD burners and Laser printers etc., Computer with LINUX OS for Quick-EXAFS. XDAC now EPICS compatible runs with VME crate and VME scalers and motor drivers. Also new step-pak motor drivers and power supply is being used.

  • Links