Talk:9-j symbol

Asymptotics
I would like to add a section discussing the asymptotics of the 9-j symbol. This talk section can be used to discuss and improve the proposed asymptotics section on the main page.

These asymptotics have played a role in the study of quantum gravity and have also played a role in atomic physics and the study of symmetry factors in group theoretical calculations for particle physics. There are also asymptotics sections on the 3-j and 6-j symbol pages. — Preceding unsigned comment added by 78.248.106.53 (talk) 20:42, 6 December 2012 (UTC)

12-j and 15-j
There is a way of generalizing from here, to create the higher-j symbols. It would be really really spliffy if this article supplied that generalization. Yes, these do actually show up in calculation. The 12-j has been published in a few obscure books, the 15-j I think has not, but it does occur in the calculation of the rotational microwave spectrum of the highly unstable HO2 molecule in the upper atmosphere. This many j's are needed because the spin-1/2 of the electron couples to the angular momentum of the molecule, and it really does cause one emission line to be twice as strong as another.linas (talk) 05:39, 25 August 2012 (UTC)