Neon matrix ESR investigation of 12C+2 and 13C+2 : Confirmation of a 4Î£-g ground electronic state
Knight, L. B.; Cobranchi, S. T.; Earl, E. A. Neon matrix ESR investigation of 12C+2 and 13C+2 : Confirmation of a 4Î£-g ground electronic state. J. Chem. Phys. 1988, 88, 7348-7348.
The 1 2C+ 2 and 1 3C+ 2 cation radicals have been isolated in neon matrices by the photoionization of C2(g) generated by the laser vaporization of thin carbon disks. A new procedure of supporting and thermally outgassing such targets for laser vaporizationESR studies in rare gas matrices is described. The ESR results confirm the 4Î£-ˆ’ g ground electronic state assignment for C+ 2 and provide a valence orbital electronic structure characterization based on the 1 3C hyperfine structure (hfs). The ESR lines are extremely narrow for a high-€spin powder sample and an intense off-€angle or -€˜-€˜extra-€™-€™ absorption feature exibits unusual hfs. Normally forbidden (Î”M S >1) transitions were detected at low magnetic fields. The magnetic parameters for 1 3C+ 2 in a neon matrix at 4 K are: D=3668(3) MHz; g -Š¥ =2.0018(5); g -ˆ¥ =2.0023(5); -€–A -ˆ¥-€– =99.4(8) MHz; and -€–A -Š¥-€– =95.2(5) MHz.
Journal of Chemical Physics