Photoelectron spectroscopy of SinH− (n=2–4) anions

Abstract

Lithium cluster anions: Photoelectron spectroscopy and ab initio calculations J. Chem. Phys. 134, 044322 (2011); 10.1063/1.3532832Stepwise hydration of the cyanide anion: A temperature-controlled photoelectron spectroscopy and ab initio computational study of CN − ( H 2 O ) n , n = 2 -5 Photoelectron spectroscopy and ab initio study of mixed cluster anions of [(CO 2 ) 1-3 (Pyridine) 1-6 ] − : Formation of a covalently bonded anion core of (C 5 H 5 N-CO 2 ) − Vibrationally resolved photoelectron spectra of Si n H Ϫ (nϭ2 -4) have been measured at a photodetachment wavelength of 355 nm ͑3.493 eV͒. The electron affinities of Si 2 H, Si 3 H, and Si 4 H are 2.31Ϯ0.01, 2.53Ϯ0.01, and 2.68Ϯ0.01 eV, respectively. Vibrational frequencies for the neutral ground states and a low-lying state of Si 2 H are also determined. Assignment of the electronic states and vibrational frequencies is facilitated by comparison with ab initio calculations. The calculations show that the H atom in Si 4 H and Si 4 H Ϫ is bonded to a single Si atom, in contrast to the bridged structures found for the smaller clusters. These calculations, along with photoelectron energy and angular distributions, yield a definitive assignment of the ground and nearly degenerate first excited states of Si 2 H.

Silicon molecules in space and in the laboratory

“…Detection of longer chains and larger ring radicals (e.g., Si 3 H 2 , Si 3 H, Si 4 H) should be possible because the time-of-flight mass spectrum of a discharge of silane measured in our laboratory indicates that Si 3 and larger silicon clusters are only about 10% less abundant than the ubiquitous Si 2 dimer, and because the photodetachment spectrum of some of the proposed molecules has been measured by Neumark and coworkers [58]. Many chain and ring isomers of comparable stability probably exist for silicon hydrides with three or more silicon atoms because of the ability of silicon to be either singly or multiply bound to adjacent silicon atoms in the cluster.…”

Anion photoelectron spectroscopy of small boron nitride clusters: adiabatic detachment energies and vibrational frequencies of low-lying electronic states in B2N and B3N

“…Spectra at two laser polarizations (θ = 0 • and θ = 90 • with respect to the direction of the ejected electron) were recorded for both species. This allows one to distinguish overlapping transitions with different photoelectron angular distributions [7,21]. The angular distribution can also indicate the atomic orbital parentage of the molecular orbital from which the electron is detached [22].…”

Electrical current and laser radiation effects on amorphous solids

“…Si-e has bound states at 1.389521 eV, 0.527234 eV, and 0.025 eV [10]. There was reported [14] on negative ions Si n H À (n = 2, 3, 4) with their bound states levels, and clusters such as Si À 3 etc. also with their bound states levels.…”