Publications [#254625] of Myron L. Wolbarsht

Journal Articles

1. Matheson, IBC; Lee, J; Yamanashi, BS; Wolbarsht, ML (1974). Measurement of the absolute rate constants for singlet molecular oxygen(¹Δ_g) reaction with 1,3-diphenylisobenzofuran and physical quenching by ground state molecular oxygen. Journal of the American Chemical Society, 96(11), 3343-3348.
   (last updated on 2018/09/26)

   Abstract:
   Singlet oxygen (1Δg) has been produced in Freon 113 solution by pumping the oxygen 1Δg + 1v ← 3Σg- electronic transition by 1.06 μm radiation from a continuous Nd-YAG laser or a Q-switched Nd-glass laser. The singlet oxygen thus produced was detected by reaction with the acceptor 1,3-diphenylisobenzofuran (DPBF) Comparison of the amount of DPBF concentration change with the amount of singlet oxygen produced has shown that the rate constant of reaction of DPBF with singlet oxygen obtained by Merkel and Kearns and others is an order of magnitude too high but corresponds to the total rate constant which we measure for reaction plus quenching. The rate of quenching of singlet oxygen by ground state oxygen has been measured to be 2.7 × 103 l. mol-1 sec-1 in Freon 113, only twice the rate in the gas phase measured by Wayne and others. © Copyright, 1974, by the American Chemical Society.