Abstract
IT has come to our notice that independent studies of pure-rotation spectra of the symmetric-top molecule H3SiI have been made in our two laboratories. The J = 2 → 3 and J = 3 → 4 transitions of H328SiI were observed at Schenectady with a Stark modulation microwave spectrograph, and the J = 3 → 4, J = 4 → 5 and J = 5 → 6 transitions were observed at Birmingham with a microwave spectrograph of the ‘video’ type operating between about 20,000 Mc./sec. and 40,000 Mc./sec. Good agreement exists between the results of the two investigations. The hyperfine structures of the spectra can be well fitted to patterns calculated for the nuclear quadrupole coupling of the iodine nucleus, second-order effects being allowed for1. For H328SiI, B0 is 3,215.6 Mc./sec., the corresponding moment of inertia, IB, is 260.90 × 10−40 gm.cm.2, and the nuclear quadrupole coupling factor, eqQ, for 127I is — 1,240 ± 30 Mc./sec.
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SHARBAUGH, A., HEATH, G., THOMAS, L. et al. Microwave Spectrum and Structure of Iodosilane. Nature 171, 87 (1953). https://doi.org/10.1038/171087a0
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DOI: https://doi.org/10.1038/171087a0
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