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Spectrophotometer

Category

Spectroscopy methods and lasers

Manufacturer and Model

Agilent - Cary 7000 

Specifications

Cary 7000

Monochromator Double out-of-plane Littrow monochromator

Grating

  • 70 x 45 mm
  • UV-Vis Ruled line diffraction grating, 1200 lines/mm blazed at 250 nm
  • NIR Ruled line diffraction grating, 300 lines/mm blazed at 1192 nm

Beam splitting system

  • Rotating beam splitter, which measures a sample, dark and reference signal
  • per cycle with a speed of 30 Hz

Detectors

  • UV-Vis R928 PMT
  • NIR Cooled PbSmart PbS

Limiting resolution (nm)

  • UV-Vis <0.048 nm
  • NIR <0.2 nm

Stray light (%T)

  • At 220 nm (10 g/L NaI ASTM method) <0.00007%
  • At 370 nm (50 mg/L NaNO2) <0.00007%
  • At 1420 nm (H2O, 1 cm pathlength) <0.0002%
  • At 2365 nm (CHCl3, 1 cm pathlength) <0.00045%

Wavelength range (nm)

  • (N2 purge required below 185 nm)
  • 175–3300 nm

Wavelength accuracy (nm)

  • Deuterium lamp lines
  • UV-Vis: 190–900 nm +- 0.08 nm
  • NIR: 760–3000 nm +- 0.4 nm

Wavelength reproducibility (nm)

  • Peak separation of repetitive scanning of a UV-Vis line source <0.025 nm
  • Peak separation of repetitive scanning of a IR line source <0.1 nm
  • Standard deviation of 10 measurements, UV-Vis <0.005 nm
  • Standard deviation of 10 measurements, NIR <0.02 nm

Photometric accuracy (Abs)

  • Using double aperture method at 0.3 Abs UV-Vis <0.00025 Abs

Cary Universal Measurement Accessory

Measurement modes

  • Absolute specular refl ection at variable angle from 5–85° in 0.02° intervals
  • Direct transmission and variable angle transmission from 0–90° in 0.02° intervals
  • Diffuse scattering, refl ection or transmission through independent sample rotation (360°) and detector
  • positioning between 10–350° at 0.02° in intervals
  • Absorptance, A where A= 1–R–T at variable angle without moving the sample or beam onto the sample
  • for improved productivity and greater accuracy.
  • Refl ection/Transmission at single wavelength (read) or wavelength range (scan)

Wavelength range 190–2800 nm

Auto polarizer wavelength range 250–2500 nm

Sample size

  • Diameter:
    • 5 mm minimum–275 mm maximum
    • 255 mm if detector slide mount is installed
    • 235 mm if a depolarizer is mounted in detector slide mount
  • Maximum physical thickness: 30 mm using standard supplied sample holder

Apertures

  • Incident beam: 1°, 2° and 3°
  • Detector: 1°, 1.8°, 2, 3°, 4°, 4.4°, 5° un 6°