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State-to-state differential cross sections (DCSs) for rotationally inelasticscattering of H2O by H2 have been measured at 71.2 meV (574 cm-1) and 44.8 meV(361 cm-1) collision energy using crossed molecular beams combined withvelocity map imaging. A molecular beam containing variable compositions of the(J = 0, 1, 2) rotational states of hydrogen collides with a molecular beam ofargon seeded with water vapor that is cooled by supersonic expansion to itslowest para or ortho rotational levels (JKaKc= 000 and 101, respectively).Angular speed distributions of fully specified rotationally excited finalstates are obtained using velocity map imaging. Relative integral crosssections are obtained by integrating the DCSs taken with the same experimentalconditions. Experimental state-specific DCSs are compared with predictions fromfully quantum scattering calculations on the most complete H2O-H2 potentialenergy surface. Comparison of relative total cross sections and state-specificDCSs show excellent agreement with theory in almost all details

State-to-State Differential and Relative Integral Cross Sections for Rotationally Inelastic Scattering of H2O by Hydrogen