State-selective dissociation processes in core-excited alcohol molecules

State-selective dissociation processes of the O 1s core-excited alcohol molecules and deuterium effect were investigated for CH3OH(D), C2H5OH(D), CD3CH2OH, and C6H5CH2OH. For all aliphatic alcohols, state-selective suppressions of OH+ (OD+) yield are observed at the first resonance. Hydroxy-deuterated effects on the H+ (D+) yield from O-H(D) site for CH3OH(D), and on the OH+ (OD+) yield from C2H5OH(D) support the ultra-fast dissociation mechanism as the origin of the suppression in OH(D) containing fragment ions at the first resonance. State-selective formation of CD3CO+ from CD3CH2OH and C6H5CO+ from C6H5CH2OH at the first resonance suggests a new type of state-selective reaction mechanism mediated by ultra-fast dissociation at the core-excited state. (c) 2005 Elsevier B.V. All rights reserved.