Formation of an alignment in collisions of laser excited sodium with xenon atoms

Abstract

Abstract. By photon absorption from a monomode dye-laser beam a spatially ordered velocity distribution ('atomic beam') of sodium atoms excited to the 3p 2P~/z-state, is created. It is predicted theoretically that in collisions of these atoms with atoms of a heavy foreign gas an alignment of the electronic orbital angular momentum is produced. This alignment leads to the appearance of a linear polarization in the sensitized D2-fluorescent light. This polarization is verified experimentally and interpreted in terms of a simplified T-operator. It turns out that the scattering distribution for sensitizing collision is of the wide-angle type.

Optical pumping in 3He with a laser

“…Another interesting case is when the laser has two different frequencies (in practice it could be achieved with two distinct lasers tuned to different frequencies). For instance, one could think of pumping simultaneously the F = 1/2 and F = 3/2 hyperfine sublevels of the 2 3S1 state, in order to reduce the hyperfine population difference created by the first laser and increase the optical pumping by a sort of « ping-pong effect » between the two hyperfine sublevels, as in sodium [22]. However, for any combination of 2 lasers tuned on 2 different Ck components, the model pre- (6) The model is valid even when the transition 23S-23P is satured by the pumping light beam; equations (26) and (27) include terms corresponding to stimulated emission.…”

Holography in biology and medicine

“…Berdowsky and Krause 1968, Kamke 1975 are correct, then the effect may probably be explained by the non-equilibrium conditions of excitation in the strong field due to the displacement of the absorption lines in the field relative to the emission lines of the lamp without the field, which may lead to a non-equilibrium velocity distribution of the M* atoms. A similar effect is actually used in the new experimental technique of laser-excited atom velocity selection, as given by Elbel et al (1975). If the zero-field result of Franz and Sooriamourthi (1973) is correct, it would be desirable to verify the fulfilment of a broad line and weak pumping conditions in Gallagher (1967), Berdowsky and Krause (1968) and Kamke (1975) because in the case of their violation, the nuclear spin correction to the cross section may differ significantly from the known one (Bulos and Happer 1971, Rebane and Rebane 1972a, b, Franz and Sooriamourthi 1973.…”

Hole burning: A discrete kinetic approach

“…It has been observed that in this case the absorption spectrum is peaked halfway between the two hyperfine transition resonance frequencies. The velocity-changing collisions lead to a strong increase of the absorption through sodium atoms because of the higher number of fluorescence cycles [3], [4]. Renzoni et.…”