Abstract
The quadrupole coupling constants and asymmetry parameters have been measured for 23Na in NaHF 2 and NaDF 2 and an estimate obtained for the quadrupole coupling constant of 39K in KHF 2 using nuclear quadrupole double-resonance (NQDR) techniques. Both fluorine and hydrogen were used as the detecting nuclear species. Using the same field-cycling techniques as are used in NQDR the very low field NMR of the HF 2 − ion was measured. By a comparison of theory with experiment it was possible to deduce a F-H bond length of 0.115(1) nm for KHF 2 and 0.113(l) nm for NaHF 2.
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