Angular momentum of trapped atomic particles

D. J. Wineland, J. J. Bollinger, Wayne M. Itano, J. D. Prestage
1985 Journal of the Optical Society of America. B, Optical physics  
In axially symmetric atomic-particle traps, the angular momentum of the particles about the symmetry axis is conserved in the absence of external torques. Changes in this angular momentum owing to laser scattering are discussed.
doi:10.1364/josab.2.001721 fatcat:k275mkm7bnh4hes7lmqyg5oc6u