Talk:Larmor precession

message: The equation for the Larmor frequency is \omega{}=-\gamma{}B_{0}. This means that the sign given in the equation on the page is incorrect. See for example reference 1.
--144.32.196.109 (talk) 07:30, 2 September 2009 (UTC)
replies: text: This is not correct, or at the very least extremely deceptive. It is well known that Hydrogen has a positive gyromagnetic ratio and a clockwise precession, which would be directly contradictory to an \omega{}=-\gamma{}B_{0} equation. This article is likely confusing due to the repetitive reference to a negatively charged particle. In addition there are a numerous references in the literature and established reputable sources that contradict this, for example: page 25 of NMR for Physical and Biological Scientists (Pochapsky & Pochapsky); or Chemistry LibreTexts. The sign should be positive \omega = \gamma B, counter-clockwise precession is due to a negative gyromagnetic ratio (which frequently occurs with negatively charged particles).  — Preceding unsigned comment added by 150.212.127.24 (talk) 15:52, 25 February 2019 (UTC)
thread_title:  Sign 

message: Is not Larmor precession exactly the same as free induction decay (FID), in which case should not the articles be integrated, with redirection? 
GilesW 10:16, 22 September 2007 (UTC)
replies: text: Just wanted to note that this was answered at the  FID talk page. --Qrystal (talk) 22:33, 23 November 2007 (UTC)
thread_title: FID

message: Was just trying to determine whether this page is referring to the total angular momentum, or just the spin angular momentum.  It isn't clear from the context of the page, unless of course, the meaning of J is what makes it clear.  If so, wouldn't it be better to be explicit about what J represents, by clearly stating that it means the total L + S?  --Qrystal (talk) 22:47, 23 November 2007 (UTC)
thread_title:  Total Angular Momentum? 

message: what is the energy formula? clearly energy should be released. Since the precession will cause the electromagnetic wave, i.e. the release of photon. it must be in a higher energy state, then precesses and release energy by release a photon to lower energy state. What are two energy levels? and they difference? Jackzhp (talk) 23:05, 17 September 2013 (UTC)
thread_title: Energy change

message: What is the direction of precession? use the cross product helicity? Jackzhp (talk) 22:30, 14 October 2013 (UTC)
replies: text: I suspect you are right.  From HERE, "ω = -dφ/dt (the rotation is left-handed in the direction of B)"  The answer may be that the precession of magnetic moment is this way, whereas for a negatively charged particle the spin and magnetic moment are in opposite directions.  The small arrow in the figure seems to be the spin angular momentum vector, and the particle is negatively charged.  Not sure I am happy with the figure this way.  Bdushaw (talk) 11:20, 27 January 2015 (UTC)

text: See, for example, this figure from gyromagnetic ratio.  For a negatively charged particle gamma is negative.  The figure seems to show the spin vectors in both cases, rather than the magnetic moment.  Still not happy with that.  Bdushaw (talk) 11:35, 27 January 2015 (UTC)
replies: text:  Is the schematic in the top right still wrong? It doesn't look like anyone changed anything. I'm going to change the caption from "the spin angular momentum" to "the magnetic moment", which should fix things because the magnetic moment and angular momentum point in opposite directions for a negatively charged particle... right? Csmallw (talk) 16:08, 28 April 2020 (UTC)
thread_title: Precession direction

message: The units of angular frequency are wrong in the given formula!  — Preceding unsigned comment added by 194.249.198.102 (talk) 11:07, 28 August 2015 (UTC)
thread_title: Error in "Including Thomas precession"

message: The BMT equation is a topic of its own. I intend to move it to a separate article. It can easily be cited - Jackson, Gourgoulhon, and Barut quickly spring to mind and there is surely no shortage of papers on it. M∧Ŝc2ħεИτlk 21:09, 29 December 2016 (UTC)
thread_title:  [[Bargmann-Michel-Telegdi equation]]