Abstract
A novel quintuplet spectrum is observed in 3He atoms' metastable state 23S1, when linear polarized light is adopted to probe the alignment component of its F=3/2 hyperfine structure. Static and oscillating magnetic fields produce magnetic resonance and Rabi nutation in ground state 11S0, respectively. After Fourier transform, centre frequency of the metastable-state quintuplet spectrum coincidences with the ground state Larmor frequency, and frequency separations between the five peaks equal to that of ground state Rabi nutation. Similar quintuplet spectrum is observed in 4He metastable state mixed with 3He hybrid vapor.
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