1. The observed 2 to 0 lines show an extreme hyperfine structure . 2. Many measurements of magnetic moments and hyperfine structure followed. 3. This is due to differing isotopes and hyperfine structure . 4. The observed hyperfine structure of atomic spectra was inconsistent with the proton electron hypothesis. 5. This effect is analogous to the hyperfine structure in atomic spectra due to nuclear spin. 6. The spectrum showed a pair of lines, each split into two with the hyperfine structure of 7 Li. 7. It is mainly a magnetic dipole moment; the quadrupole moment does cause some small shifts in the hyperfine structure as well. 8. With Goudsmit he investigated the Zeeman effect of hyperfine structure of atomic levels, which became the subject of his 1930 PhD thesis. 9. In 1931, he began the study of the hyperfine structure of spectral lines, which began his pioneering work on measuring nuclear spin. 10. The resonant element in atomic clocks utilizes the hyperfine structure of rubidium's energy levels, and rubidium is useful for high-precision timing.
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