Superhyperfine interaction of the SiH3 radical with Xe

The SiH3 radical formed by the reaction of SiH4 with H in a Xe matrix was investigated by ESR spectroscopy. In addition to the spectra of the radicals SiH3 and SiH5 reported by the present authors [J. Chem. Phys. 83, 4504 (1985)], well resolved new lines were observed superimposed on a broad background signal. These lines were attributed to the superhyperfine structure of a species interacting with xenon nucleus. The magnetic parameters for the species which give rise to the superhyperfine structure were determined.