System Description
79
The radiation is dispersed at the grating to produce a spectrum. The rotational
position of the grating effectively selects a segment of the spectrum, reflecting this
segment through the exit slit (Selectable Slit 2) to mirror M3.
Figure 18 Optical Path for Lambda 40
The exit slit restricts the spectrum segment to a near-monochromatic radiation beam.
The slits provide a spectral bandpass of 0.5 nm, 1 nm, 2 nm and 4 nm.
From mirror M3 the radiation is reflected onto a beam splitter which allows 50% of
the radiation to pass onto plane mirror M4, and reflects 50% of the radiation onto
plane mirror M5.
Mirror M4 focuses the radiation beam in the sample cell.
Halogen
lamp
Deuterium
lamp
Filter wheel
M2
M1
Selectable
Slit 1
Selectable
Slit 2
M5
Reference
Sample
M3
Detector
Lens
Lens
Detector
M4
Grating
(Monochromator)
Beam Splitter
M = Mirror
M1, M4, and M5 = Plane Mirror
M2 = Toroidal Mirror
M3 = Spherical Mirror
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Summary of Contents for Lambda 20
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