Model 231 Seya-Namioka Monochromator
for Scanning and MCP or CCD Spectroscopy
- Increased work space
- Internally welded Stainless steel construction
- Precision Micrometer Adjustable Slits
- High resolution
- Gratings rotate about their apex
- All metal sealed versions (UHV) for synchrotron beam line applications
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The Model 231 1-meter focal length Seya-Namioka uses simple grating rotation to scan wavelengths. An angle of 70° 15' subtends the entrance and exit slit arms. The focal length provides excellent resolution and a lot of work space. Stainless steel construction makes this design suitable for use with high vacuum and contaminant free experimental chambers or microchannel plate intensified detectors.
The McPherson Model 231 Seya-Namioka features fixed entrance and exit slit positions as well as fixed beam direction from the exit slit. When used as a scanning spectrometer these valuable characteristics make the Model 231 suitable for use in applications at synchrotron storage rings. The Model 231M4 (231 version or revision 4) was designed specifically synchrotron applications. It offers white light bypass optics as well as diverting optics when the use of the spectrometer is required. Multiple grating turrets are employed to further simplify instrument demands during experiments.
Wavelengths from 30-nm to 1.2-um can be covered within the scanning range and with appropriate gratings.
| Systems can be configured with the high resolution Model 231 for a variety of applications. The system pictured at the right provides a very high resolution (discrete wavelength) collimated beam. The long focal length and high dispersion permits to operate the hollow cathode source, Model 629, at large apertures and maintain excellent spectral purity. |
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The Model 231M4 - designated for synchrotron applications - is a all-metal-seal UHV design with bilaterally adjustable slits, a multiple (3) grating turret, and an ion pump system suitable for operating at base pressures of 10-10 torr. Unique slit assemblies are available that include 'bypass' optics, allowing the user to permit energetic synchrotron or FEL beams to enter the monochromator or pass-by for another experiment further down the beam line.
PDF format Data Sheet for the Model 231 Seya Namioka available here
Specifications
McPherson Model 231 1-meter focal length f/23
Vacuum Monochromator / Spectrometer
| Focal Length | 1-meter focal length Seya-Namioka design |
| Angle between Slits | 70° 15' |
| f / No. | 23 |
| Grating | 30 x 50-mm ruled area |
| Wavelength Accuracy | +/-0.1-nm (on counter, with 1200 G/mm grating) |
| Wavelength Reproducibility | +/- 0.005 nm (with 1200 G/mm grating) |
| Focal Plane | Multiply dispersion by the width of your detector for range |
| Wavelength Range | refer to grating of interest for range |
Performance of the Model 231 with various gratings:
| Grating (G/mm) (others available) |
2400 |
1800 |
1200 |
600 |
300 |
| Wavelength Range from 30-nm to |
150-nm |
200-nm |
300-nm |
600-nm |
1.2-um |
| First Order Littrow Blaze |
holo | holo | holo | holo | holo |
| 80 nm | | 150 nm | 150 nm | 700 nm |
| | | | 160 nm | |
| | | | 276 nm | |
| Resolution (nm) at 313.1-nm |
0.013 |
0.018 |
0.025 |
0.05 |
0.10 |
| Dispersion (nm/mm) |
0.42 |
0.55 |
0.83 |
1.66 |
3.33 |
E-Mail Sales@McPhersonInc.com, Telephone (978) 256-4512, Fax (978) 250-8625
McPherson, Inc. - 7A Stuart Road, Chelmsford, MA 01824 USA
