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北京市所在地
Vacuum Ultraviolet Spectrograph or Spectrometer
Works from 30nm VUV
Stainless Steel Construction
More Work Space at Slits
· Vacuum Ultraviolet Spectrograph or Spectrometer
· Works from 30nm VUV
· Stainless Steel Construction
· More Work Space at Slits
The 235 is the McPherson 500 mm focal length Seya-Namioka monochromator. This optical system is housed in a clean stainless steel housing capable of achieving 10-6 torr vacuum. It delivers typical resolution of 0.05 nm with a 1200g/mm grating. An angle of 70° 15' subtends the entrance and exit slit arms. Seya-Namioka mounting maintains all components (slits and gratings) on the Rowlａnd circle. Resolution is maintained over a broad spectral region, astigmatism should be considered depending on the application. The focal length provides increased resolution and work space. Stainless steel construction makes this proven design suitable for use with high vacuum, contaminant free experiments or microchannel plate intensifiers. Wavelengths from 30-nm to 1.2-um can be covered within the scanning range and with appropriate gratings. The 235 is for scanning and microchannel plate intensifier or CCD spectroscopy.
Model 235 PDF Data Sheet
Optical Design | Seya-Namioka |
Angle of Incidence | 35.125 degrees |
Focal Length | 500 mm |
f/no. | 11.6 |
Wavelength Range | refer to grating of interest for range |
Wavelength Accuracy | +/- 0.10 nm (with 1200 g/mm grating) |
Wavelength Reproducibility | +/- 0.005 nm (with 1200 g/mm grating) |
Grating Size | 30 x 50 mm (single kinematic grating holder) |
Slits | Continuously variable micrometer actuated width 0.01 to 2 mm. Settable height. |
Vacuum | High vacuum 10E-6 torr |
Focal Plane | 25 mm microchannel plate or direct detection CCD |
Performance with various diffraction gratings:
Grating Groove Density (g/mm) | 2400 | 1200 | 600 | 300 |
Spectral Resolution (nm,FWHM) | 0.025 | 0.05 | 0.1 | 0.2 |
Dispersion (nm/mm) | 0.83 | 1.6 | 3.3 | 6.6 |
Wavelength Range ~30nm up to (nm) | 150 | 300 | 600 | 1200 |
Blaze Wavelength: (nm) | holo | 70 | 150 | 550 |
150 | ||||
200 |
* gratings work best from 2/3 to 3/2 the blaze wavelength
