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U2A External Homepage
Beamline U2A
General Information
Source Type
Bending Magnet Status
Operational General User Beamtime
50% Energy Range Category
Infrared Energy Range
30-10000cm-1 (to 40000cm-1 with visible light)
Beamline Type
Facility Beamline Technique(s)
Infrared microspectroscopy
High Pressure Research
Infrared vibrational spectroscopy
Institution(s)
COMPRES
Carnegie Institution of Washington
NSLS
Research Types
Measurement of far- to near-infrared spectra of a wide variety of materials from ambient to ultrahigh pressures at variable temperatures by coupling synchrotron infrared microspectroscopic and other techniques with diamond-anvil cell methods.
Contact Information
Spokesperson 
G Carr, Brookhaven National Laboratory, carr@bnl.gov, 344-2237
Russell Hemley, Carnegie Institution of Washington, hemley@gl.ciw.edu, 202/478-8951
Local Contact
Zhenxian Liu, Carnegie Institution of Washington, zxliu@bnl.gov, 2024788900
Beamtime Scheduler
Zhenxian Liu, Carnegie Institution of Washington, zxliu@bnl.gov, 2024788900
Beamline Phone
631-344-5502
Instrumentation
Beamline Characteristics
| Spectral Range |
Instrument |
Spectral Resolution |
Greater than Globar |
Spot Size (mm) |
Total Angular Acceptance (mrad) |
| 30 – 10000 cm-1, 3.7 – 1240 meV |
Bruker 66v /S & Bruker Irscope II |
1 cm-1, 0.12 meV |
100X-1000X |
4 |
45H x 45V |
Source Type
Bending magnet Optical System
U2 is an infrared port delivering at least 80 milliradians horizontally by 40 milliradians vertically. The beam is extracted through a wedged diamond window, then divided into two equal beam lines, U2A and U2B. Each line has a Michelson interferometer, U2A a Bruker 66v/S vacuum bench with a nitrogen-purged Bruker microscope and custom optics; U2B a Nicolet Magna operated in vacuum with a custom measuring chamber.
Mirror: Water-cooled silicon carbide beam extraction; beam is steered and focused by a combination of ellipsoidal and planar mirrors to provide a 1:1 image of the source. Beam passes through a wedged diamond window and continues through rough vacuum and then through another diamond window and into the evacuated or nitrogen-purged instrumentation for U2A. Experimental Apparatus
Bruker 66v/S vacuum FTIR: Frequency Range: 10-10000 cm-1; Resolution: 1 cm-1; Detectors: MCT-A (mid-IR), SiB / Si bolometer (far-IR) / DTGS-FIR (D201); Software: OPUS NT v4.0
Bruker IRscope II: Frequency Range: 600-10000 cm-1; Resolution: 1 cm-1; Detectors: MCT-A, SiB / Si bolometer (far-IR), DTGS-FIR (D201), Silicon Diode (visible); Software: OPUS NT v4.0
Custom IR microscopes: Long working distance (40 mm) that can be used for near- to mid-IR absorption and reflectivity measurements with diamond cells inside cryostats and furnaces (to above 200 GPa). Near- to Far-IR vacuum microscope for routine high-pressure (diamond-cell) spectroscopy and microspectroscopy.
Visible Spectrograph: Frequency Range: 0 - 1300 nm mechanical range (300 and 1500g/mm gratings); Measurable spectral range: 400 nm - 1.06 micron; Resolution: 0.03 nm
Lasers: Coherent Innova 90 plus Argon ion laser; Total power: 6 watts at multi-line visible, Single line from 514.5 nm to 454.5 nm; Coherent Titanium-Sapphire Tunable Laser; Tuning Range: SW/MW optic set: 700 - 930 nm; Pump Power: Innova 90 Plus at 6 watts multi-line visible; Output Peak Power: 725 mW Computer System Hardware & Software
Data acquisition: Pentium III, 350 MHz computer running Windows 2000 professional; 3.5" floppy drive; CD-RW drive; 100 MB Zip drive; Laser Jet 2100TN printer.
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