Knowledge Bank

In a continuing effort to study different aspects of the infrared spectrum of water vapor, the 1.1 $\mu$m bands of $H2\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O(8530-9100cm-1$) have been recorded with a ten-meter focal length vacuum infrared spectrograph using a cooled photomultiplier as a detector. Using a path length of 24 meters and water vapor pressure between 4-16 mm of Hg the rotational structure observed has been mainly due to the $\nu 1+\nu 2+\nu 3$ band of the $H216O$ molecule.