title: Characterization of silicon-carbon clusters by infrared laser spectroscopy:  the nu 3(sigma u) band of linear Si2C3.
abstract: The nu 3(sigma u) fundamental vibration of 1 sigma g+  Si2C3  has  been  observed using a laser vaporization-supersonic cluster beam-diode laser spectrometer. Forty rovibrational transitions were measured in the range of 1965.8 to 1970.9 cm-1 with a rotational temperature of 10-15 K. A least-squares fit of these transitions yielded the following molecular constants: nu 3(sigma u)=1968.188 31(18) cm-1, B"=0.031 575 1(60) cm-1, and B'=0.031 437 4(57) cm-1. These results are in excellent agreement with recent Fourier transform infrared (FTIR) measurements of Si2C3 trapped in a solid Ar matrix [J. Chem. Phys. 100, 181(1994)] and with ab initio calculations [J. Chem. Phys. 100, 175 (1994)] which suggest cumulenic-like bonding for Si2C3, analogous to the isovalent C5 carbon cluster.
authors.affiliation: Department of Chemistry, University of California, Berkeley 94720, USA.
authors.forename: A
authors.initials: A
authors.lastname: Van Orden
authors.forename: T F
authors.initials: TF
authors.lastname: Giesen
authors.forename: R A
authors.initials: RA
authors.lastname: Provencal
authors.forename: H J
authors.initials: HJ
authors.lastname: Hwang
authors.forename: R J
authors.initials: RJ
authors.lastname: Saykally
mesh_terms: D001128:Argon; D001256:Astronomy / Q000379:methods; D002244:Carbon / Q000737:chemistry*; D017554:Carbon Compounds, Inorganic; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D007834:Lasers; D017655:Silicon Compounds / Q000737:chemistry*; D013055:Spectrophotometry, Infrared / Q000379:methods*
chemical_list: D017554:Carbon Compounds, Inorganic; D017655:Silicon Compounds; D001128:Argon; D002244:Carbon; C022088:silicon carbide