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Rotational state specific dissociation dynamics of D2O via the C electronic state
Yuan Cheng1, Lina Cheng, Qing Guo
1State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
Abstract:
The rotational state resolved photodissociation dynamics of D(2)O via the C state has been investigated using the D-atom Rydberg "tagging" time-of-flight technique, with a tunable vacuum ultraviolet photolysis light source. The photodissociation action spectrum of the D(2)O C<--X (3p(z)<--1b(1)) band has been recorded. The linewidths of rotational transitions have been determined by the Lorentzian profile simulation. Product kinetic energy distributions and angular distributions for individual rotational lines have been measured. From these distributions, the internal state distributions of the OD radical product as well as the state resolved angular anisotropy parameters for each rotational transition have been obtained. The dramatic variation of the OD product state distributions from different rotational excitations has been observed. These results suggest that there are two distinctive coupling channels from the C state to the lower electronic states: homogenous electronic coupling to the A((1)B(1)) state, resulting in a vibrationally hot OD(X (2)Pi) product and Coriolis-type coupling between the C((1)B(1)) state and the B((1)A(1)) state. Through the second mechanism, OD(X (2)Pi) as well as OD(A (2) summation operator(+)) products are produced. The OD(X (2)Pi) products are mainly populated in the vibrationally cold but extremely rotationally excited states. The comparison between the D(2)O and H(2)O results illustrates that the C((1)B(1))-->B((1)A(1)) pathway is relatively larger in the D(2)O photodissociation as a consequence of the isotopic effect.
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