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• W2016201764 abstract "The energetics, structure, and anharmonic force fields of the isomers H2SiO, cis-HSiOH, and trans-HSiOH have been studied using coupled cluster methods and basis sets of up to spdfgh quality and including inner-shell correlation. Inner polarization functions on Si were found to be of crucial importance for the correct reproduction of computed properties. At the basis set limit at 0 K, the H2SiO isomer is more stable than the two others by about 0.5 kcal/mol. cis-HSiOH is marginally more stable than trans-HSiOH (0.05 kcal/mol); deuteration shifts the equilibrium toward the trans form. The computed fundamentals for the {H,D} and {16O,18O} isotopomers closely track the experimental ones in an argon matrix, except for a few reassignments which impose themselves. Our best computed geometry for H2SiO, r(SiH) = 1.4733 Å, r(SiO) = 1.5140 Å, and θ(HSiH) = 111.97°, agrees within experimental error with the most recent determination. Using a recently proposed Schwartz-type extrapolation, we obtain the following ∑D0 values (including core correlation, atomic spin−orbit splitting, and anharmonic zero-point energy): SiO 189.9, SiH2 (a 3B1) 124.5 kcal/mol, SiH2 (X 1A1) 145.80 kcal/mol, and H2SiO 292.6 kcal/mol, which we expect to be accurate to about 0.3 kcal/mol. The former three agree with experiment to within the latter's uncertainty but have smaller error bars. As a byproduct, we obtain a basis set limit for the singlet−triplet splitting in silylene, T0 = 21.35 ± 0.1 kcal/mol. To assist future gas-phase infrared and microwave studies on silanone and hydroxysilylene, computed anharmonic spectroscopic constants for all species concerned have been presented, and complete anharmonic force fields are available as Supporting Information." @default.
• W2016201764 created "2016-06-24" @default.
• W2016201764 creator A5015331508 @default.
• W2016201764 date "1998-01-30" @default.
• W2016201764 modified "2023-09-27" @default.
• W2016201764 title "Anharmonic Force Fields and Accurate Thermochemistry of H₂SiO, <i>cis</i>-HSiOH, and <i>trans</i>-HSiOH" @default.
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• W2016201764 doi "https://doi.org/10.1021/jp9731718" @default.
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