# Talk:Larmor precession

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## Sign

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)

## Symbols

Other than B it almost seems like the author went out of his way to use non-standard symbols. In the literature most use tau for torque, rather than capital gamma, and L (sometimes I) for angular momentum, rather than J. It may seem trivial but it confuses and requires the reader to carefully translate in their head each symbol.

## FID

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)

Just wanted to note that this was answered at the FID talk page. --Qrystal (talk) 22:33, 23 November 2007 (UTC)

## Total Angular Momentum?

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) In practice, this is a very complicated question. Depending on the frequencies used, this can be the frequency of a single object, or a composite object. I think the formula applies generally to any object for which you know the gyromagnetic ratio... although I can't promise. —Preceding unsigned comment added by 75.153.112.114 (talk) 02:22, 2 October 2008 (UTC)

## Energy change

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)

## Precession direction

What is the direction of precession? use the cross product helicity? Jackzhp (talk) 22:30, 14 October 2013 (UTC)

The direction of the precession is shown in this video: http://www.youtube.com/watch?v=MOrk9ZQy1Dw. It would appear that the schematic at the top right of this Wikipedia article shows the precession to be in the wrong direction! Or am I missing something? 128.97.129.123 (talk) 02:52, 20 November 2013 (UTC)