Scanning and MCP or CCD Spectroscopy
Increased work space
Internally welded Stainless steel construction
Precision Micrometer Adjustable Slits
High resolution
· Scanning and MCP or CCD Spectroscopy
· Increased work space
· Internally welded Stainless steel construction
· Precision Micrometer Adjustable Slits
· High resolution
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.
Model 231 PDF Data Sheet
Optical Design | McPherson Model 231 1-meter focal length f/23 Vacuum Monochromator |
Angle between Slits | 70° 15' |
Focal Length | 1-meter focal length Seya-Namioka design |
f/no. | 23 |
Wavelength Range | refer to grating of interest for range |
Wavelength Accuracy | +/-0.1-nm (on counter, with 1200 G/mm grating) |
Wavelength Reproducibility | +/- 0.005 nm (with 1200 G/mm grating) |
Grating Size | 30 x 50-mm ruled area |
Focal Plane | Multiply dispersion by the width of your detector for range |
Performance with various diffraction gratings:
Grating (G/mm) (others available) | 2400 | 1800 | 1200 | 600 | 300 |
Wavelength Range from 30-nm to | 150nm | 200nm | 300nm | 600nm | 1.2um |
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 |
Blaze Wavelength: (nm) | Holo | Holo | Holo | Holo | Holo |
80nm | 150nm | 150nm | 700nm | ||
160nm | |||||
276nm |
* gratings work best from 2/3 to 3/2 the blaze wavelength
