Specific fragmentation of [(CH3)2CO]Ar n heteroclusters induced by the Ar L23- and O K-shell excitation

Abstract: Ionic fragmentation following the inner-shell photoexcitation of [(CH3)2CO]Ar n heteroclusters was investigated in the Ar L23- and O K-edge regions. A partial ion yield (PIY) measurement revealed that and various acetone fragments (, , , , and ) were produced following the Ar L23-shell excitation. In the O K-edge region, the PIY of O+ exhibited a sharp resonance peak at the O 1s→π∗(Cnce excitation. The selective O+ formation was interpreted as the suppression of statistical fragmentation, which was dominant in isolated acetone, owing to the dissipation of excess energy into Ar clusters. [Copyright &y& Elsevier]