The 4ν2 band of H216O

Abstract
The first observation of the 4ν2 band of H2 16O is reported. A hot water vapor Fourier transform spectrum between 5 930 and 6 400 cm-1 has been used for this purpose. About 30 lines of the 4ν2 band have been assigned leading to the band center 4ν2 = 6 134.030 ± 0.412 cm-1. Rotational constants for the (040) vibrational state have been determined and an estimation of the total band intensity is : Sv(4 ν2) = 0.189 x 10-22 cm-1/molecule.cm -2 at 296 K