Raman McTriple
For Raman work across a wide wavelength range, the McTriple is a research tool everyone can use. Reflective optics with optimized coatings provide good efficiency in the ultraviolet (UV.)
McPherson's Raman McTriple provides excellent stray light rejection. It is ideal for Raman spectroscopy to 50cm-1 from Raleigh scatter in the Visible. The McTriple uses high quality reflective optics that work over the 185 to 1000-nm* range. It is efficient in the UV. This Raman system is ideal for the weakest samples. It works at f/4.7 and uses fewer reflective surfaces. The McTriple aperture ratio collects about 5X more light!
Photo below left shows the triple monochromator system. Below right, loading sample in the Model 125 macro chamber.
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McPherson's McTriple has the following features: The entire optical train uses reflective optics to enable the wide wavelength range without refocusing. The high performance subtractive double pre-monochromator is used for band selection and edge formation. The pre-spectrometer utilizes aberration corrected holographic gratings for best efficiency and imaging. The holographic gratings have high fidelity surfaces further reducing scatter. The slits are continuously adjustable and together with the high precision drive system flexibly tune the image location and optimize rejection. |
Specifications
McTriple for Raman
| Focal Length | First stage: 200 mm, Second stage: 200 mm, Third stage: 670 mm |
| Slit Locations | Axial. Second entrance direct to Spectrograph stage. |
| Slits | 0.01 to 4 mm wide; 2 to 20 mm high |
| Slits (Subtractive intermediate) | 0.025 to 10 mm wide; 0.025 to 10 mm high |
| Slits (Spectrograph entrance) | 0.01 to 4 mm wide; 2 to 20 mm high |
| f / No. | f/4.8 |
| Dispersion | 0.83 nm/mm with 1800-g/mm, Spectrograph stage. |
| Resolution | 1 cm^-1 at 500 nm; 4 cm^-1 at 244 nm |
| Grating Size | (2X) 40*45mm and (1X) 120 x 140mm; select from many gratings including original (master) high fidelity holographic gratings |
| Drive Mechanism | Sine bar |
| Step Size | 0.0002 nm |
| Wavelength Accuracy | +/-0.2-nm (on counter, with 1200 G/mm grating) |
| Wavelength Reproducibility | +/- 0.005 nm (with 1200 G/mm grating) |
| Focal Plane | 50-mm, multiply dispersion by the width of detector for range |
| Wavelength Range | refer to grating of interest for range |
McTriple Spectral Resolution and Coverage
| Grating | Mechanical Range | CCD Coverage** |
| 300 | 0 to 6000 | 126-nm |
| 600 | 0 to 3000 | 63-nm |
| 1200 | 0 to 1500 | 32-nm |
| 1800 | 0 to 1000 | 21-nm |
| 2400 | 0 to 750 | 16-nm |
| 3600 | 0 to 500 | 11-nm |
**1-nm corresponds to about...
170cm-1 at 240 nm
40cm-1 at 500 nm
15cm-1 at 750 nm
* To work from 185 to 1000-nm efficiently more than one grating may be required.
