Nuclear quadrupole resonance of Hg201
Five nuclear quadrupole resonance lines have been observed in polycrystalline HgCl2. From their frequencies, the magnitudes of the quadrupole coupling constants eQqzz(Hg201)=720 Mc/sec and eQqzz(Cl35)=44.3 Mc/sec were evaluated. Comparison of the Cl35 coupling constant in HgCl2 with that known for the free Cl atom from atomic beam experiments facilitates the discussion of the molecular structure. A quadrupole coupling constant of 1000 Mc/sec per p electron in the 6s6p configuration of free Hg is deduced from the Hg201 coupling in HgCl2. This value can be directly compared with the coupling of the 6s6p, P22 HgI term, eQqzz(Hg201,pz)=780 Mc/sec, which is equivalent to the value of the quadrupole parameter B=0.27×10-3 cm-1 known from optical hfs investigations. Whereas a standard analysis of the hfs of the P22 term had given Q(Hg201)=0.5×10-24 cm2, a discrepant value Q(Hg201)=0.2×10-24 cm2 was obtained from the P11 term. Our results yield a value 0.6×10-24 cm2, in fair agreement with the larger value found for the P22 term. © 1954 The American Physical Society.
Dehmelt, HG; Robinson, HG; Gordy, W
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