Characterization of C_3HSi^-

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

Structural and spectroscopic properties of the astrophysically relevant SiC_3H^- anion are investigated at the RCCSD(T) and CASSCF levels of theory. The molecule presents a total of 12 isomers (4 lineal and 8 cyclic), all of them showing singlet ground electronic states. The stability of the linear isomer {l}-SiC_3H^- (X^1 Σ^-) is notorious. The B0 rotational constant of {l}-Si12C_3H^- and {l}-Si12C_3D^-, the dipole moment, excitation energies to the lowest electronic states and electron affinities have been estimated.

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