Abstract
Abstract Sulfur monoxide (SO) radical has been produced in the gas phase by pyrolysis of ethylene sulfoxide (C2H4=SO) at 510 °C. The vacuum ultraviolet photoionization efficiency curve between 915 and 1220 Å 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 ion from C2H4=SO are 10.28±0.01, 9.49±0.02, and 10.13±0.01 eV. In the system of C2H4=SO, the AP is lower than the IP and this phenomenon has only been found in this system.
Published Version
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