Ab initio characterization of C5

Details Ab initio characterization of C5 Ab initio characterization of C5

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jchph.127o4318m&link_type=abstract

Journal of Chemical Physics, Volume 127, Issue 15, pp. 154318-154318-9 (2007).

Physics

Chemical Physics

3

Electronic And Magnetic Properties Of Clusters, Spectroscopy And Geometrical Structure Of Clusters, Ab Initio Calculations, Potential Energy Surfaces For Ground Electronic States, Vibrational Analysis, Infrared Spectra

Scientific paper

In this paper, the structure and spectroscopic parameters of the C5 cluster are determined using multiconfigurational quantum chemical methods as implemented in the MOLCAS software. A number of spectroscopic properties (band center positions, l-doubling parameters, and rotational constants) have been characterized. From the new results, the assignments of previous astrophysical observations [J. Goicoechea et al., Astrophys. J. 609, 225 (2004)] are discussed. A detailed exploration of the global potential energy surface confirms that C5 has a X 1Σg+ linear isomer of prominent stability and, at least, three minimum energy structures showing singlet electronic ground states. Two of them are cyclic and one has a nonplanar geometry. Vertical and adiabatic electronic transitions and vibrational spectroscopic parameters are determined for the most stable linear isomer using multiconfigurational second order perturbation theory (CASPT2) using an active space containing 12 valence orbitals with 12 active electrons and extended ANO-type basis sets. The infrared spectrum has been analyzed from an anharmonic force field derived form the local surface, determined from the energies of a grid of 1350 geometries. The force field includes four coupling terms. The CASPT2 band center position of the ν7(πu) anharmonic fundamental has been calculated to be at 102 cm-1, which validates the assignment to C5 of the pattern of bands centered at 102 cm-1 observed with the ISO telescope.

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