Patent ID: 7714579

Claim:
An NMR probe comprising: three coils forming layers radially spaced from each other, the layers being disposed to surround a sample tube, the three coils including an inner coil, an intermediate coil, and an outermost coil; said inner coil being capable of multiply resonating with RF waves (HF) of a frequency corresponding to a resonant frequency of from 3 H nuclei to 19 F nuclei and with RF waves (LF) of a frequency lower than the resonant frequency of 205 Tl; said intermediate coil being capable of multiply resonating with the HF and LF and producing an RF magnetic field perpendicular in direction to an RF magnetic field produced by the inner coil; said outermost coil being capable of resonating with at least RF waves for NMR lock and producing an RF magnetic field which is perpendicular in direction to the RF magnetic field produced by the intermediate coil but which is coincident in direction with the RF magnetic field produced by the inner coil; a first tuning-and-matching circuit connected with the inner coil and being capable of multiply resonating with at least two different frequencies selected from a range from the LF to the HF; a second tuning-and-matching circuit connected with the intermediate coil and being capable of multiply resonating with at least two different frequencies selected from the range from the LF to the HF; and a third tuning-and-matching circuit connected with the outermost coil and being capable of being tuned to at least the RF waves for NMR lock.