SXR and EUV Rowland Circle Monochromator
The one-meter focal length Model 248/310 is a grazing incidence monochromator built in the Rowland circle configuration. It is a compact and versatile instrument useful from one to 310 nanometers and best for wavelengths shorter than 100 nm (greater than 12 eV). Grazing angles improve reflective efficiency. Moving the exit slit or other detector along the Rowland circle, a circle with Diameter equal to the diffraction gratings Radius, insures best focus and spectral resolution at the wavelength of interest.
The Model 248/310 is available in several different configurations: as a scanning monochromator, with a direct-detection CCD, with a tangential microchannel plate intensifier, or in reverse, as a variable source of XUV and soft x-ray emission. All versions are available for high vacuum or optionally Ultra High Vacuum (UHV) with metal seals. It is well equipped with adjustable slits, in vacuum grating-focus adjustment, high precision wavelength drive, and filter insertion slide. This instrument may be built with angle of incidence 84 to 88 degrees depending on the application.
|Optical Design||Rowland Circle Grazing Incidence Monochromator|
|Angle of Incidence||87 degrees standard, 84 to 88 degrees optionally available|
|Focal Length||1 meter|
|Wavelength Range||refer to grating of interest for range|
|Grating Size||20 x 25 mm (single, kinematic grating holder)|
|Slits||Continuously variable micrometer actuated width 0.01 to 0.5 mm. Settable height.|
|Vacuum||High vacuum 10E-6 torr standard, UHV optionally available|
|Focal Plane||40 mm microchannel plate or 25 mm direct detection CCD|
|Grating Groove Density (g/mm)||3600||2400||2160||1800||1200||600||300||150||133.6*|
|Spectral Resolution (nm,FWHM)||0.006||0.009||0.01||0.012||0.018||0.036||0.038||0.072||0.16|
|Dispersion (nm/mm)||0.025 to 0.09||0.03 to 0.15||0.03 to 0.15||0.04 to 0.18||0.05 to 0.27||0.08 to 0.34||0.08 to 0.34||0.16 to 0.7||0.4 to 1.6|
|Wavelength Range** 1 nm up to (nm)||10||17||19||23||35||70||73||140||310|
|Blaze Angle (deg)||Holo||Holo||1||Holo||Holo||Holo||1||2||2|
* recommended for calibration, ** gratings work best from 2/3 to 3/2 blaze
The McPherson Grazing Incidence instrument can be configured to suit an application or experimental requirement. To diagnose transient plasmas the user may need to collect a range of data quickly and possibly with good time resolution. This instrument is equipped with a microchannel plate intensifier with gating capabilities. To monitor a narrow region of spectra (e.g. FEL, HHG x-ray laser) a CCD can be used for high resolution direct detection. CCD readout requires longer time scales but they provide excellent sensitivity and range. For material testing reflectance / transmittance or calibration in the soft x-ray and extreme UV the 248/310 can be set up in reverse, to scan sources and deliver specific wavelengths to samples or devices under test.
Call to discuss the deatils of your application today.