The vacuum ultraviolet circular dichroism instrument developed in this laboratory and originally described in 1970 has been modified and improved. The principal modification is the replacement of two lenses by a collimating mirror, thus converting to reflection optics. As a result, the efficiency of the instrument was considerably improved; particularly at wavelengths shorter than 160 nm. The effectiveness of the polarization optics at short wavelengths was investigated and found to be unimpaired out to 135 nm.

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