14 years after our theory was published, a new experimental observation was reported by a Japanese research group, which directly confirmed one of our theoretical predictions: the field and frequency modulations in magnetic resonance is not equivalent, ended a long debate in magnetic resonance studies.
When I was asked whether the new theory can be experimentally verified before I left the research field, my reply was that the non-equivalency of magnetic field and photon frequency seems obscure by using commercial spectrometers, but it might be observable if some purpose-made facilities could be built. Around 2005, to my surprise, I was informed that the noticeable difference between field and frequency modulations was observed by a Japanese group, mainly by Dr Hirata by using their home-made frequency-modulation spectrometer.
Here is the reply from Dr Hirata when I was in Shanghai.
"Your article gave me a lot of insight for field and frequency modulation." - Dr Hiroshi Hirata
In 2016, another experimental evidence was reported. some apparent difference between frequency modulation and field modulation was observed by Ansermet group from their home-made 260 GHz (9.4T) electron spin resonance (ESR) spectrometer. In short, the ESR spectrum of the sample could be detected only when frequency modulation was applied while no ESR spectrum could be detected.
Indeed, distinction between magnetic field and photon frequency is essential not only for achieving theoretical consistency, but also to comprehend and predict new electron and nuclear spin dynamics. This has been further demonstrated in recent studies of spin-photon entanglement.
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