The Big Bands of H 2 O

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Abstract
Using input data drawn from many scientific disciplines, we show that there is one big (most intense) vibrational band of H2O for each polyad of bands characterized by N = 2.nu.i + .nu.2 + 2.nu.3. Thus the important gas-phase vibrational energy levels and the intensities for excitation from the ground vibrational state can be characterized by simple analytic functions of a single quantum number N in place of the usual three vibrational quantum numbers .nu.i .nu.2, and .nu.3. These functions also apply to liquid H2O excitations with slightly altered parameters and probably to the solid state. The correlations should permit us to utilize gas-phase charged-particle energy degradation techniques to study the thermalization of low-energy electrons in liquid water which arise as secondary, tertiary, etc., particles from any type of primary ionizing radiation. Liquid water is a useful surrogate of biological matter, and an understanding of the thermalization of low-energy electrons in water should help achieve a fundamental understanding of the biological effects of ionizing radiation.

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