title: IR photodissociation spectroscopy of H7(+), H9(+), and their deuterated analogues.
abstract: Cluster ions of H7(+)/D7(+) and H9(+)/D9(+) produced in a supersonic molecular beam with a pulsed discharge source are mass selected and studied with infrared laser photodissociation spectroscopy. Photodissociation occurs by the loss of H2 (D2) from each cluster, producing resonances in the 2000-4500 cm(-1) region. Vibrational patterns indicate that these ions consist of an H3(+) (D3(+)) core ion solvated by H2 (D2) molecules. There is no evidence for the shared proton structure seen previously for H5(+). The H3(+) ion core vibrational bands are weakened and broadened significantly, presumably by enhanced rates of intramolecular vibrational relaxation. Computational studies at the DFT/B3LYP or MP2 levels of theory (including scaling) are adequate to reproduce qualitative details of the vibrational spectra, but neither provides quantitative agreement with vibrational frequencies.
authors: Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA.
authors: J W
authors: JW
authors: Young
authors: T C
authors: TC
authors: Cheng
authors: B
authors: B
authors: Bandyopadhyay
authors: M A
authors: MA
authors: Duncan