DTMc300 Triple Grating Monochromator

STMc300 triple grating monochromator

For those applications where the scattered light performance of a single monochromator is not sufficient, the excellent optical performance as the TMc300 may still be experienced with two of such used in tandem constituting thereby the DTMc300 double monochromator.

The DTMc300 maintains the flexibility of configuration and ability to cover a wide spectral range of the TMc300, within a single scan.

Compatible with the full range of sources, detectors and accessories of the Bentham portfolio, in the additive dispersion mode, the DTMc300 monochromator is at the heart of many of our light measurement solutions, particularly those incorporating a UV component, whilst the subtractive dispersion mode is sought by high level laboratories seeking minimum measurement uncertainty due to the resulting lack of dispersion at the exit slit.

Key features include:


Configuration Pair symmetrical Czerny Turner monochromators arranged for either additive or subtractive dispersion
Focal length Total focal length: 600mm (additive);
Individual Units: 300mm
Grating mount Triple grating turret
Number of gratings 1-3 (see separate Gratings page for full range)
Grating size 68 x 84 mm
Aperture ratio f/4.1 (at all grating angles)
Number of entrance/exit ports 1 or 2 in both monochromators
Mechanical resolution grating drive 0.000072°/ step
Slit type Fixed, micrometer or motorised variable
Slit width & height 10µm-10mm (w) x 20mm (h)
Order sorting 6/8-position filter wheel (includes shutter)
Filter size 25mm diameter (see separate Order Sorting Filters page for full range)
OPTICAL PERFORMANCE (quoted for 1200g/mm gratings)
Spectral range Within range 200nm-50µm
Linear dispersion 1.35 nm/mm (additive)
Wavelength accuracy ± 0.1nm
Wavelength reproducibility ± 0.025nm
Resolution full/reduced slit height 0.15/0.05nm
Stray light rejection at 2.5 FWHM 10-8
Wavelength acquisition speed 2000nm/s
Computer interface USB
Software control BenWin+/SDK
Overall dimensions 634w x 360d x 211h
Optical height 115 mm
Construction Single machined casting
Weight 28 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)


ADTMc300 configuration A

BDTMc300 configuration B

CDTMc300 configuration C

Dimensions (mm)

DTMc300 dimensions