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A set of common force constants was obtained for the silyl group (SiH3–X) using as experimental data the frequencies from silyl cyanide (X=–CN), isocyanate (X=–NCO) and isothiocyanate (X=–NCS). Initial values of the force constants were obtained by ab initio methods, using three different levels of theory, Hartree–Fock, second order Moller–Plesset and Density Functional Theory. We have analysed the...
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