Photodissociation Spectra for Size-Selected Sr<SUP>+</SUP>(CH<INF>3</INF>OH)<INF>n</INF><INF></INF> and Sr<SUP>+</SUP>(CH<INF>3</INF>OD)<INF>n</INF><INF></INF> Clusters

This study presents photodissociation data on the mass-selected clusters Sr⁺(CH<INF>3</INF>OH)<INF>n</INF><INF></INF> and Sr⁺(CH<INF>3</INF>OD)<INF>n</INF><INF></INF>, n = 1−4, in the wavelength range from 310 to 1500 nm. The parent ion clusters exhibit loss of hydrogen atoms by C−H bond cleavage in their ground electronic states, a channel that increases in magnitude with increasing cluster size. Electronic states of clusters based on excitation of metal-centered d, p ← s transitions are observed. The cluster spectra exhibit a size-dependent red shift that is consistent with increased metal−ligand repulsion with increasing size. The clusters decay by solvent evaporation, methyl radical loss to form the metal hydroxide cation, and loss of oxygen-bound hydrogen atoms to form the metal methoxide cation, SrOCH<INF>3</INF>⁺.