The pure quadrupole resonance spectra were observed on Cl 35 and Cl 37 in BCl 3 and Br 79 and B 81 in BBr 3 at several temperatures. The spectrum of each nucleus consists of characteristic doublet (ν I and ν II ) with the intensity ratio of ca. 3 to 5. The Zeeman study with a single crystal of BBr 3 was also carried out at liquid nitrogen temperature (77°K), to determine the asymmetry parameter η. The results are as follows:
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Takehiko Chiba (1958) studied this question.
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