Photodissociation of C2H3 via its first excited (A) over tilde(2)A " state is studied at 327.4 and 366.2 nm using high-n Rydberg-atom time-of-flight technique. C2H2((X) over tilde(1)Sigma(g)(+))+H product channel is identified. Product translational energy distributions reveal two highly-inverted vibrational progressions of C2H2((X) over tilde(1)Sigma(g)(+)) (most likely C=C stretch and its combination band with C-H bend). Anisotropic H-atom angular distributions indicate a short (A) over tilde(2)A " state lifetime with respect to dissociation. D-0(C2H2-H)=33.0 +/- 0.5 kcal/mol is obtained.