Abstract
Photodissociation dynamics of C4H2 at 164.41 nm through the Rydberg state R((1)Σu) have been studied using the high-resolution H atom Rydberg tagging technique. Experimental evidences show that two different predissociation pathways exist to form the ground C4H (X(2)Σ(+)) and electronically excited C4H (A(2)Π) products: the former has statistical and isotropic translational energy distribution through internal conversion (IC) to the ground state, while the latter has non-statistical and anisotropic translational energy distribution through IC to the excited repulsive state. The vibrational progressions of C4H (A(2)Π) products have also been observed and assigned.
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