Lambda 20/Lambda 40 Installation and Maintenance Guide - VTP UP
Lambda 20/Lambda 40 Installation and Maintenance Guide - VTP UP
Lambda 20/Lambda 40 Installation and Maintenance Guide - VTP UP
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System DescriptionThe radiation is dispersed at the grating to produce a spectrum. The rotationalposition of the grating effectively selects a segment of the spectrum, reflecting thissegment through the exit slit (Selectable Slit 2) to mirror M3.DeuteriumlampHalogenlampM1M2M = MirrorM1, M4, <strong>and</strong> M5 = Plane MirrorM2 = Toroidal MirrorM3 = Spherical MirrorFilter wheelSelectableSlit 1M5ReferenceM3LensDetectorBeam SplitterSelectableSlit 2LensGrating(Monochromator)M4SampleDetectorFigure 18 Optical Path for <strong>Lambda</strong> <strong>40</strong>The exit slit restricts the spectrum segment to a near-monochromatic radiation beam.The slits provide a spectral b<strong>and</strong>pass of 0.5 nm, 1 nm, 2 nm <strong>and</strong> 4 nm.From mirror M3 the radiation is reflected onto a beam splitter which allows 50% ofthe radiation to pass onto plane mirror M4, <strong>and</strong> reflects 50% of the radiation ontoplane mirror M5.Mirror M4 focuses the radiation beam in the sample cell.79
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