Laser Imaging and Vibrational Spectroscopy Facility

Raman-1: Resonate Raman Spectrometer

Raman-1 Resonate Raman SpectrometerRaman-1 computer, etc.

Model: Spex 1877E
Location: 104 Partners III
Methodology and Rate: Vibrational (VIB) -

Current Instrument Status: Operational

Training

Operating Procedures

  • Specific laser training for Ramen-1
  • General Raman-1 operating procedures
  • Methodology specific operating procedures

Helpful Links

The Raman-1 instrument consists of a Spex 1877E Triplemate Monochromator fitted with a liquid nitrogen cooled CCD detector and a Coherent Mira 900 Ti:Sapphire laser system. The Spex 1877E Triplemate is a spectrograph specially constructed to provide low-stray light and flat undistorted focal plane which is ideal for sensitive work with CCD detectors. The Tripmate has two main optical sections. The first is a 0.22m double monochromator with gratings locked into a Czerny-Turner subtractive-dispersion mode, which act as a variable-wavelength, selectable bandpass filter. This filter stage passes the non-dispersed radiation from the sample into the entrance slit second optical section. The second section or the spectrograph stage is a 0.6m single monochromator, which in turn disperses the radiation onto the CCD detector. Each of the optical sections is configurable with a number of different gratings, to provide a wide range of resolutions. The primary light source for Raman-1 is the Coherent Mira 900 Ti:Sapphire laser system which is fully described in the laser instrument pages. This system is normally configured for Resonate Raman work on biomaterials, but is usable for other materials. Methodologies that are most often conducted with this instrument are routine sample measurement of proteins, and cryogenic work on these materials.

Applications

  • Spectrum measurements (Raman, Resonate Raman) over a range of 1,000-185nm
  • Synthesis characterization
  • Reaction monitoring
  • Materials analysis
  • Defect and surface contamination analysis
  • Spectroscopic research experiments
  • Cryogenic characterization of samples
  • Pharmaceuticals (compound distribution, phases, combinatorial chemistry, etc.)
  • emiconductors (stress, contamination, superlattice structure, doping effects, etc.)
  • Polymers (polymorph identification, blend morphology, monomer and isomer analysis, etc.)
  • Life Science (DNA analysis, nucleic acids, cholesterol, lipids, etc.)
  • Physics (ceramics, nanophases, etc.)
  • Chemistry (phase transitions, catalysts, oxides, surfactants, etc.)
  • Carbon Compounds (nanotubes, fullerenes, diamond, etc.)
  • Environmental (pollutants, metal complexes, etc.)

Configurations

  • Filter Stage Gratings (paired)
    • 600 groves/mm 485nm blaze
    • 1200 groves/mm 250nm blaze
    • 1200 groves/mm 500nm blaze
    • 1200 groves/mm 750nm blaze
  • Spectrograph Stage Gratings
    • 1200 groves/mm 500nm blaze
    • 1200 groves/mm 750nm blaze
    • 2400 groves/mm 400nm blaze
    • 3600 groves/mm 450-250nm blaze
  • Detector
    • Liquid Nitrogen cooled CCD
  • Light sources
    • Coherent Mira 900 Ti:Sapphire laser
    • Coherent Verdi-10W 532nm CW
  • Additional
    • The spectrometer is purged with dry compressed air, which improves the signal to nose ratio of the spectra.
    • Solid sample spinner Raman accessories is available
    • Standard gas cooled sample holder
    • Cryogenic Displex sample holder Raman accessories is available

Specifications

  • Spectral Range: 185-1000nm (54,000-10,000cm-1)
  • Wavelength accuracy: +0.5nm
  • Wavelength Resettability: +0.2nm

Note: This instrument requires additional laser training. Please see Training for more information.