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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 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.
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 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.
Zhenxian Liu, Carnegie Institution of Washington, zxliu@bnl.gov, 2024788900

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