The work presented here investigates the dynamics of the photodissociation of ethyl ethynyl ether at 193.3 nm with photofragment translational spectroscopy and laser-induced fluorescence. The data from two crossed laser-molecular beam apparatuses, one with vacuum ultraviolet photoionization detection and one with electron bombardment detection, showed that only cleavage of the CO bond to form a C 2 HO radical and a C 2 H 5 ͑ethyl͒ radical occurs. We observed neither cleavage of the other CO bond nor molecular elimination to form C 2 H 4 ϩCH 2 CO ͑ketene͒. The C 2 HO radical is formed in two distinct product channels, with 37% of the radicals formed from a channel with recoil kinetic energies extending from about 10 to 70 kcal/mole and the other 63% formed from a channel with lower average recoil energies ranging from 0 to 40 kcal/mole. The measurements using photoionization detection reveal that the C 2 HO radical formed in the higher recoil kinetic-energy channel has a larger ionization cross section for photon energies between 10.3 and 11.3 eV than the radical formed in the lower recoil kinetic-energy channel, and that the transition to the ion is more vertical. The radicals formed in the higher recoil kinetic-energy channel could be either X (2 AЉ) or à (2 AЈ) state ketenyl ͑HCCO͒ product and the shape of the recoil kinetic-energy distribution fitting this data does not vary with ionization energy between 10.3 and 11.3 eV. The C 2 HO formed in the channel with the lower kinetic-energy release is likely the spin forbidden ã (4 AЉ) state of the ketenyl radical, reached through intersystem crossing. The B state of ketenyl is energetically inaccessible. We also consider the possibility that the lower kinetic-energy channel forms two other C 2 HO isomers, the CCOH ͑hydroxyethynyl͒ radical or the cyclic oxiryl radical. Signal from laser-induced fluorescence of the HCCO photofragment was detected at the electronic origin and the 5 1 0 band. The fluorescence signal peaks after a 20 s delay, indicating that HCCO is formed with a significant amount of internal energy and then subsequently relaxes to the lowest vibrational level of the ground electronic state. The data show that the photodissociation of ethyl ethynyl ether produces C 2 HO with unit quantum yield, establishing it as the first clean photolytic precursor of the ketenyl radical, a key species in combustion reactions.