The microwave spectrum of the LiO radical

Publisher Website
Google Scholar
Abstract
The rotational spectra of the 7LiO radical in the v=0 and v=1 vibrational states were observed in the millimeter and submillimeter wave region. The LiO radical was generated by the reaction of lithium vapor with N2O directly in a high temperature absorption cell. The rotational and centrifugal distortion constants, Λ‐type doubling constants, spin–orbit interaction constant, and hyperfine interaction constants were derived through analysis of the rotational spectra observed in the present study combined with the radio frequency spectra of Λ‐type transitions reported by S. M. Freund et al. [J. Chem. Phys. 5 6, 1467 (1972)]. The LiO radical was confirmed to have a 2Πi ground electronic state with an exceptionally large Λ‐type doubling constant, as in the case of NaO. A pure precession hypothesis applied to the observed p Λ‐type doubling constant gives the Σ–Π energy difference to be 2565 cm−1.