Photoionization Study of the Sulfur Monoxide Radical Produced by Pyrolysis of Ethylene Sulfoxide

Article abstract of DOI:10.1246/bcsj.58.3475

Sulfur monoxide (SO) radical has been produced in the gas phase by pyrolysis of ethylene sulfoxide (C2H4=SO) at 510 deg C.The vacuum ultraviolet phtoionization efficiency curve between 915 and 1220 A has been obtained for the first time.Several thermodynamic data about C2H4=SO have also been obtained from direct photoionization.The values of the bond energies of D₀(C2H4=SO) and D₀(C2H4=SO⁺) are 4640+/-30 and 5160+/-30 cm^-1 respectively.Ionization potentials (IP) of the SO(X³Σ^-) radical and C2H4=SO, and the appearance potential (AP) of SO⁺ fragment ionfrom C2H4=SO are10.28+/-0.01, 9.49+/-0.02, and 10.13+/-0.01 eV.In the system of C2H4+CO, the AP is lower than the IP and this phenomenon has only been found in this system.