The M300 single monochromator, the first monochromator model introduced by Bentham over thirty-five years ago, remains popular thanks to its compact size and simplicity, ideal for dedicated applications. Compatible with the full range of sources, detectors and accessories of the Bentham portfolio, the M300 monochromator has been deployed in an exceptional range of measurements throughout the UV, visible and IR.

Key features include:

  • 300mm focal length single monochromator in Czerny-Turner configuration
  • Accommodates single kinematically-mounted diffraction grating
  • One entrance slit and one exit slit with multiple configurations available
  • Fully automated through USB 2.0 interface


Configuration Symmetrical Czerny Turner
Focal length 300mm
Grating mount Kinematic mount
Number of gratings 1
Grating size 69 x 69 mm
Aperture ratio f/4.2 (at all grating angles)
Number of entrance/ exit ports One entrance, one exit
Slit type Fixed, micrometer or motorised variable
Slit Width & Height 10µm-10mm (W) x 20mm (H)
Filter Size 25mm diameter
OPTICAL PERFORMANCE (quoted for 1200g/mm gratings)
Spectral Range Within range 200nm-50µm
Linear Dispersion 2.7nm/mm
Wavelength accuracy ± 0.2nm
Wavelength reproducibility ± 0.05nm
Resolution full/ reduced slit height 0.3/ 0.1nm
Stray light rejection at 2.5 FWHM 10^-5
Wavelength acquisition speed 15nm/s
Computer interface USB
Software Control BenWin+/ SDK
Overall dimensions 235W x 330D x 192H
Optical height (mm) 115
Weight Approx. 12 kg
Power supply Mains input 110/220V 50/60Hz
Diffraction gratings See separate Gratings page
Order sorting filters See separate Order Sorting Filters page
Filter wheel 252-6 or 252-8 (6/8-position filter wheel, includes shutter)


AM300 configuration A BM300 configuration B

CM300 configuration C DM300 configuration D


M300 dimensions front view

M300 dimensions side view