Absolute Rate Constant Measurements of OH Reactions Under Atmospheric Conditions by Laser Photolysis/Dye Laser Fluorescence

Excited-State Dynamics of CH2CHO (B̃2A‘‘)

“…The vinoxy radical, CH 2 CHO, provides a prototypical gas-phase polyatomic system for excited-state studies. Along with other alkoxy radicals, vinoxy plays a major role in the gas-phase oxidation of unsaturated hydrocarbons and is an important intermediate in combustion and photochemical smog cycles . CH 2 CHO can be produced cleanly by the 193-nm photolysis of methyl vinyl ether (MVE), and it produces a long-lived, fluorescence signal when excited in the 332−348-nm region of the B̃ 2 A‘‘−X̃ 2 A‘‘ transition.…”

“…The chemistry and dynamics of the vinoxy radical have been studied by spectroscopic methods to monitor the real time concentrations of CH 2 CHO. Of particular interest has been the O( 3 P) + C 2 H 4 reaction to produce the vinoxy radical, which has been studied by several groups. , Laser-induced fluorescence, 1b,1c,1d,57 mass spectrometry, 1a,1f and microwave 1e,9 and infrared 6,8 spectroscopies have been used to detect CH 2 CHO. The fate of the vinoxy radical with species of atmospheric interest, i .…”