The spectral absorption coefficient of water vapor was recorded in absolute units in the region 265...350 nm with the help of a spectrometer, based on the KSVU-12M spectroscopic complex, an MDR-6 double monochromator, a multipass cell, and a halogen lamp. The results confirm that the spectral band of water vapor which we studied is diffuse and that it is a band of the water molecule. It is also concluded that the observed band is the sum of at least two overlapping lines (absorption bands).
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