Determination of Absolute Product Branching Ratios in Mass Spectrometric Experiments: Detecting Acetyl Radicals at CH2CO+

D. C. Kitchen, T. L. Myers, L. J. Butler
1996 The Journal of Physical Chemistry  
The paper describes a general method for determining absolute branching ratios in mass spectrometric experiments. The method overcomes the chronic obstacle that the daughter ion fragmentation pattern of radical products is usually unknown. We report the absolute product branching ratio for competing primary C-Cl and C-C bond fission in chloroacetone after excitation on the 1 nπ* absorption band. To determine this branching ratio, acetyl chloride is used to calibrate the relative detection
more » ... ive detection efficiency of acetyl radicals at the CH 2 CO + daughter ion relative to Cl atoms at 35 Cl + . We also calculate the daughter ion production probability for CH 2 CO + formed from internally excited CH 3 CO radicals.
doi:10.1021/jp9536918 fatcat:ngzseljtdzebrgnkv7qcyplfou