title: Critical size for the observation of quantum confinement in optically excited gold clusters.
abstract: We present a systematic study of optical properties of a series of hexanethiolate-capped Au clusters of varying sizes using femtosecond transient absorption, time-resolved fluorescence, and two-photon absorption cross-sectional measurements. An abrupt change in optical properties and their trends has been found at the 2.2 nm size. Displacively excited vibrations with a period of 450 fs have been detected in the transient absorption signal for smaller clusters < or = 2.2 nm. These results strongly suggest an emerging optical gap between the highest occupied and lowest unoccupied orbitals in the narrow size range at 2.2 nm.
authors.affiliation: Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA.
authors.forename: Oleg
authors.initials: O
authors.lastname: Varnavski
authors.forename: Guda
authors.initials: G
authors.lastname: Ramakrishna
authors.forename: Junhyung
authors.initials: J
authors.lastname: Kim
authors.forename: Dongil
authors.initials: D
authors.lastname: Lee
authors.forename: Theodore
authors.initials: T
authors.lastname: Goodson