Abstract
A tunable far infrared optically pumped laser has been used to measure the
reflection R and transmission of liquid water at 25°C.
The laser covered the range 8.22–175.7 cm−1 with an
average spacing between lines of 8 cm−1. The optical data
were used to find the complex index of refraction n-ik with
typical errors of 2%. A small peak in n was observed
near 55 cm−1. This feature correlates with published Raman
data. The values of R, n, k,
and the absorption coefficient α are given in graphical
and tabular form.
© 1979 Optical Society of America
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