- #1
CuriousBanker
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- TL;DR Summary
- I understand why shielding lowers the effect of a magnetic field, but why doesn't it lower the effect of RF radiation?
I am watching this video;
at the 8:20 mark it shows that a proton in a magnetic field will align with the magnetic field very easily if there is no shielding from electrons, and therefore will require energy to shift to the opposite spin state; makes sense to me. I also understand that when there is more shielding, the proton will be less effected by the magnetic field and therefore will require less energy to move it to the opposite spin state. What I don't understand, is why don't the electrons shield the proton from the RF radiation? Electrons are effected by radiation (hence IR spectroscopy), so I'm curious as to why the RF radiation is not also shielded by the electrons. With no shielding it takes more energy to spin, but there is less shielding to block the radiation. With shielding it requires less energy to spin, but there is more shielding to block the radiation, so why isn't the same amount of radiation required to bring both nuclei into resonance? I'm guessing the answer is that RF radiation is not absorbed by electrons, whereas IR is? I don't know anything about the different types of radiation, or QM, so that's probably where my ignorance lies.
Thank you in advance
at the 8:20 mark it shows that a proton in a magnetic field will align with the magnetic field very easily if there is no shielding from electrons, and therefore will require energy to shift to the opposite spin state; makes sense to me. I also understand that when there is more shielding, the proton will be less effected by the magnetic field and therefore will require less energy to move it to the opposite spin state. What I don't understand, is why don't the electrons shield the proton from the RF radiation? Electrons are effected by radiation (hence IR spectroscopy), so I'm curious as to why the RF radiation is not also shielded by the electrons. With no shielding it takes more energy to spin, but there is less shielding to block the radiation. With shielding it requires less energy to spin, but there is more shielding to block the radiation, so why isn't the same amount of radiation required to bring both nuclei into resonance? I'm guessing the answer is that RF radiation is not absorbed by electrons, whereas IR is? I don't know anything about the different types of radiation, or QM, so that's probably where my ignorance lies.
Thank you in advance