Spherical Grating Monochromator for synchrotron beamline applications 65 to 1400-eV Grating scan range +/- 7-degrees, 0.045-arcsec resolution Index between 3 or 4 gratings under vacuum Beam deflection up or down Internal or heat sink grating cooling UHV construction for 10^-10 torr operation Bakeable to 150-degrees C

McPherson SGM beamline monochromator as built for an IBM led research team during the start up phase of the Lawrence Berkeley National Lab Advanced Light Source (ALS). At ALS it is called 'beamline 8.0.1.' It is a very productive beamline and has been the instrument used for a great deal of experimental work and many publications. McPherson provided this high performance monochromator complete with an actively water cooled entrance slit, cooled zero order baffle, internally cooled gratings (3, 82.5 x 140-mm gratings.) Entrance and exit slits may be scanned to obtain best focus and satisfy the Rowland circle geometry for any given wavelength. This instrument was the first beamline monochromator at ALS and was installed just in time for the grand opening ceremonies.

Current McPherson ultra high vacuum (UHV) instruments are baked and RGA tested prior to shipment. Unique proven McPherson designs separate support members for chambers and precision grating mechanism. This for reduced sensitivity to vibration and thermal environmental factors. Scan grating angle by computer control and use rotary or laser tilt encoders for absolute feedback. Index gratings under vacuum, manually or by motor control. We have a variety of beam line instruments and accessories available.

Monochromator resolution - Gas phase ion-yield photoabsorption spectrum at the argon 2p->4s resonance showing a monochromator resolution of 40.1 meV corresponding to a resolving power in excess of 6000. Data courtesy of D.Lindle, O.Hemmers, H.Wang, and D.Hansen (University of Nevada, Las Vegas); R.Puttner (Freie Universitat Berlin);and C. Heske (ALS.) Data taken from beamline 8.0.1 data sheet.