Timeline for Radiofrequency transmitter in an NMR experiment: Is there an involvement of (electromagnetic) radio wave?
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Apr 18 at 19:58 | vote | accept | ACR | ||
| Sep 12, 2019 at 2:00 | answer | added | ACR | timeline score: 4 | |
| Sep 11, 2019 at 0:00 | history | tweeted | twitter.com/StackChemistry/status/1171574215507611649 | ||
| Sep 10, 2019 at 19:51 | answer | added | Karl | timeline score: 2 | |
| Sep 10, 2019 at 18:46 | comment | added | Buck Thorn♦ | NMR requires a QM description to make sense of more advanced concepts, even if some of the basics can be explained using a classical description (Bloch equations). I have to admit that I don't really understand the quoted paragraph. Perhaps I belong to the portion of the NMR community that misunderstands NMR signal generation/reception ;-) | |
| Sep 10, 2019 at 17:24 | comment | added | Jon Custer | See physics.stackexchange.com/questions/334826/… or other similar NMR questions on Physics SE. | |
| Sep 10, 2019 at 16:56 | comment | added | porphyrin | I agree with (a) energy is absorbed by the sample and spins are moved from one energy levels to another. (b) implies that the coil and sample are coupled, it is just a matter of how you look at this, (as you write a play on words). Of course they are coupled, energy is absorbed. The quote you give mixes up quantum and classical ideas. NMR is a funny mix of individual spin changes studied in a quantum way and then objects such as the magnetisation which are more easily understood in a semi-classical way. | |
| Sep 10, 2019 at 16:28 | comment | added | ACR | I think this is $the$ key point, is there an absorption of radio waves (as you call it radio photon) in an NMR experiment? I disagree with point (b). | |
| Sep 10, 2019 at 16:15 | comment | added | Poutnik | Note that it is closely related to how caesium atomic clocks work. In NMR case, radio photons flips proton spins, as there is spin energy difference in magnetic field. In the clocks case, there is Cs kernel spin energy difference due kernel electron spin coupling leading to hyperfine spectrum. Effectively, the unpaired electron acts as atomic embedded magnet, creating magnetic field, instead of external magnets. | |
| Sep 10, 2019 at 14:52 | history | asked | ACR | CC BY-SA 4.0 |