Author/Authors :
Hasegawa، نويسنده , , Keisuke and Yamada، نويسنده , , Kenji and Sasase، نويسنده , , Ryouji and Miyazaki، نويسنده , , Ryota and Kikuchi، نويسنده , , Azusa and Yagi، نويسنده , , Mikio، نويسنده ,
Abstract :
Electron paramagnetic resonance (EPR) spectroscopy was employed to determine the lifetime and absolute concentration of singlet oxygen, O2(1Δg), in the gas phase. O2(1Δg) molecules were generated by gas-phase photosensitization with octafluoronaphthalene. The absolute concentration of O2(1Δg) at total pressure of 0.3 Torr was estimated to be 3 × 10−6 mol dm−3 at 305 K under our conditions using the ground-state oxygen molecule, O2( 3 ∑ g - ), as a quantitative standard. The observed lifetime of O2(1Δg) is 7 s at 0.6 Torr. This is the first report of the gas-phase lifetime of O2(1Δg) observed by EPR.
