Photoelectron-photoion momentum spectroscopy as a clock for chemical rearrangements:: Isomerization of the di-cation of acetylene to the vinylidene configuration -: art. no. 233002

We have used complete correlated momentum mapping of the photoelectron and heavy ion products from the dissociation of the di-cation of acetylene, induced by photoionizing the carbon K shell of one of the atoms, to map out the angular correlation between the electron and the axis of the target molecule. The (quasi-) symmetric decay is found to proceed through both acetylene and vinylidene configurations. By using the strongly peaked photoelectron emission to start a clock, an upper limit of 60 fs is placed on the isomerization time from the acetylene to the vinylidene configuration.