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An improved UV (ultraviolet) window is described which behaves as a and monochromator.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
88% of the total text.
Page 1 of 1
UV Window Which Behaves as a Lens and Monochromator
An improved UV (ultraviolet) window is described which behaves as a and
A very valuable technique for the examination of surface chemistry,
photoemission, requires that the surface be maintained in an ultra high vacuum
while it is illuminated by UV light of a short wavelength. This UV light is generally
obtained from a glow discharge in a gas at a pressure approximately 1 torr. A
lithium fluoride window can be used to isolate this gas from the vacuum for
energies less than 11.8 eV, and a simple and inexpensive alternative has been
described in * .
The improved window comprises a Fresnel zone plate support
consisting of concentric annuli of radius proportional to (natural
numbers)/+1/2/ alternately transparent and opaque. A 1000 Angstroms
thick film of aluminum is deposited on this support. This film has
good UV transmission and can sustain pressure differences of 1 torr
with negligible helium leakage. This window behaves as a focusing
lens for the monochromatic light emitted by the discharge lamp. If
the central clear aperture is of radius R, the focal length f = R/2//
Lambda. If the opaque zones are reflecting, it is possible to
enhance even more the throughput of this optical element. This
window provides the advantages of superior transmission and much
superior illumination of the object. The configuration of the
framework provides the unique geometry which gives the planar window