Model 275D Spectrometer
The Model 275D is a 0.2 m + 0.2 m focal length double spectrometer system combined in either an additive or subtractive mode. With its two holographic gratings and only two reflective surfaces, it has minimal light loss, maximum stray light rejection and an impressive f / 4.2.
It is an ideal instrument for many spectroanalytical purposes. It features bilaterally adjustable slits, kinematically mounted easy to interchange gratings and the means to attach stepper drives for wavelength scanning.
| Focal Length | 0.2 m | ||
| Angle between entrance and exit beam | 180 degrees | ||
| f / Number | 4.2 | ||
| Wavelength Range | 185 nm to 4000 nm | ||
| Grating (G/mm) | 1200 | 600 | 300 |
| Wavelength Range | - | - | - |
From | 185 nm | 185 nm | 185 nm |
To | 1000 nm | 2000 nm | 4000 nm |
| Holographic Range of
Optimal Efficiency (nm) |
200 - 800 | 400 - 1600 | 800 - 3200 |
| Optimal Resolution (nm) | 0.15 | 0.30 | 0.60 |
| Bandwidth (nm)
(250/500/1000/2000 um slits) (Divide by 2 for Additive Version) | 1/2/4/8 | 2/4/8/16 | 4/8/16/32 |
| Dispersion (nm/mm)
(Multiply by 2 for Additive Version) | 4 | 8 | 16 |
| Grating Size | 40 mm x 45 mm | ||
| Wavelength Accuracy with 1200 G/mm | +/-1 nm | ||
| Wavelength Reproducibility 1200 G/mm | +/- 0.1 nm |