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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 detectiondoi:10.1021/jp9536918 fatcat:ngzseljtdzebrgnkv7qcyplfou