Velocity map ion imaging applied to studies of molecular fragmentation with synchrotron radiation

A novel apparatus has been employed to investigate molecular fragmentation following inner-shell photoionization by synchrotron radiation. A modified design of the velocity map imaging spectrometer, first introduced by Eppink and Parker [A.T.J.B. Eppink, D.H. Parker, Rev. Sci. Instrum. 68 (1997) 3477], provides high detection efficiency and good focusing properties for an extended interaction region, while the use of a time and position resolving anode allows electron-ion and ion-ion coincidence measurements. We discuss overall capabilities of the spectrometer and present first results for the C(1s) photoionization of CO2. Special emphasis is placed on the analysis of time and vector correlations between ions detected in coincidence.