The Radio-frequency Source

In this source the gas inside a tube is ionized by radio-frequency 100 Watts, 10— 100 MHz). A magnetic field concentrates the discharge on the extraction region. The extraction takes place due to a potential difference between the discharge and the beam extractor. The source works very conveniently for gases. For some applications it has the drawback that the energy spread of the ions produced is larger compared with other sources. 

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Interestingly, the precessing proton can only absorb energy from the radio frequency source if the precessing frequency is exactly the same as that of the radio frequency beam and when this particular situation arises, the nucleus and the radio frequency beam are said to be in resonance, thereby justifying the term nuclear magnetic resonance . 

AE = energy absorbed from the radio-frequency source which will induce transitions between the two states of the electron h = Planck s constant ... 

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