Abstract
The nuclear quadrupole double-resonance spectrum of H3BNH3 was investigated at room temperature. The 14N line, the 11B line, and most 10B lines were found. The spectra of H3BND3 and H3B15NH3 clearly assigned one of the lines of the H3BNH3 spectrum to 14N. The Zeeman splitting of the 11B line was recorded and its shape explained by a broadening effect. The 10B lines could only be detected by application of a small steady magnetic field, partially to induce continuous coupling or to shift the stronger line of 11B. The 10B double-quantum transition |0> → |±2> shows surprisingly high intensity. The coupling constant of 11B(e2gQ = 1504 ± 10 kHz) is in excellent agreement with an earlier SCF calculation, whereas that of 14N (e2gQ = 1253 ± 13 kHz) is significantly lower than calculated (e2qQcalc = 2760 ± 1280 kHz with Q = 0.016 ± 0.007 barn). Possibly the value of the 14N nuclear quadrupole moment lies at the lower limit of the range currently assumed.
Published Version
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