The total cross section for H22O-H22O scattering is measured with a supersonic nozzle beam system. The primary beam has a narrow velocity distribution, and the velocity is varied by control of the nozzle temperature. Velocities are determined by time-of-flight techniques. Cross sections obtained are averages over a Maxwellian distribution of the target molecules. Data at three velocities are presented. The cross sections for H2O are surprisingly small, for example, 3.07 x10-14 cm2 at 1x105 cm/sec, indicating little contribution from the dipole-dipole interaction.
W. R. Snow et al., "Molecular Beam Measurements Of Total Collision Cross Sections Of H 22O," The Journal of Chemical Physics, vol. 58, no. 6, pp. 2517 - 2520, American Institute of Physics, Jan 1973.
The definitive version is available at https://doi.org/10.1063/1.1679533
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01 Jan 1973