Tunable diode laser studies of the reaction of Cl atoms with CH3CHO

The reaction Cl + CH3CHO --> HCl + CH3CO (1) was studied using flash photol ysis / tunable diode laser absorption spectroscopy to monitor the productio n of HCl. The rate coefficient, k(1), was measured to be (7.5 +/- 0.8) x 10 (-11) cm(3) molecule(-1) s(-1) at 298 K. HCl (v = 0) and HCldagger (v = 1) were measured directly in this study and the yields of HCl (v = 0, 1, > 1) for the reaction of Cl with CH3CHO were determined to be 0.44 +/- 0.15, 0.5 6 +/- 0.15, and < 0.04, respectively. The rate coefficient for the quenchin g of HCIdagger (v = 1) by CH3CHO was k(17e) = (4.8 +/- 1.2) x 10(-11) cm(3) molecule(-1) s(-1). (C) 1999 John Wiley & Sons, Inc.