title: A spectroscopic case for SPSi detection: The third-row in a single molecule.
abstract: In moving beyond the second row of the periodic table for molecules of astronomical and atmospheric significance, the exploration of sulfur and phosphorus chemistry is essential. Additionally, silicon is abundant in most astrophysical environments and is a major component of most rocky bodies. The triatomic molecule composed of each of these atoms is therefore a tantalizing candidate for spectroscopic characterization for astrophysical reasons as well as gaining further understanding into the chemical physics of molecules that are not carbon-based. The current work employs high-level quantum chemical techniques to provide new insights into this simplest of heterogeneous third-row atom systems. The fundamental vibrational frequencies are all within the 350-600 cm-1range and do not demonstrate strong anharmonicities. These frequencies, rotational constants, vibrationally excited state spectroscopic data, and related isotopic substitution information produced will aid in laboratory experimentation and, even potentially, telescopic observation since modern instruments possess the power to resolve extremely fine details.
authors: Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA.
authors: Brian
authors: B
authors: Finney
authors: Department of Chemistry and Biochemistry, Georgia Southern University, Statesboro, Georgia 30460, USA.
authors: Ryan C
authors: RC
authors: Fortenberry
authors: Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA.
authors: Joseph S
authors: JS
authors: Francisco
authors: Department of Chemistry, Washington State University, Pullman, Washington 99164-4630, USA.
authors: Kirk A
authors: KA
authors: Peterson