O+2ions dissociation studied by threshold photoelectronndash;photoion coincidence method

摘要

The threshold photoelectronndash;photoion coincidence method was used to study O+2dissociation. Previous results were confirmed and a careful analysis of the time of flight peak shapes using a Monte Carlo simulation gave us new results. The lifetime of theBthinsp;2Sgr;minus;gstate was measured to be 70mnplus;25 ns independently of the vibrational quantum number. The IIIthinsp;2prod;ustate which dissociates towards the O+(2D0)+O(3P) and O+(2P0)+O(3P) limits shows anisotropic distribution of fragment ions. Thecthinsp;4Sgr;minus;u(v=0) state which was previously observed to dissociate into O+(4S0)+O(1D), its adiabatic limit, is seen to predissociate also about 40percnt; towards the ground state limit.