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Ukrainian Journal of Physics

A determination of the collision relaxation constants for a forbidden transition by means of nonlinear polarization spectroscopy for a three-level gas in a magnetic field

В. П. Міщенко

Published Dec 1, 1982• 0 citations
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A method for quantum-mechanical calculations of cross sections for the Zeeman transitions in collisions of ${}^{3}P$ atoms with structureless targets in a magnetic field is presented and applied to the study of magnetic and electronic relaxation in oxygen-helium and carbon-helium collisions at cold and ultracold temperatures. The rate constants for collisionally induced transitions between Zeeman levels in ground-state oxygen have large magnitudes in a 1 T field. It is shown that magnetic fields induce the forbidden ${}^{3}{P}_{1}$ $\ensuremath{\rightarrow}$ ${}^{3}{P}_{0}$ transition in ultracold collisions of carbon with helium. The cross section vanishes at zero energy for field-free collisions, but becomes infinitely large in a finite magnetic field, varying with velocity $v$ and magnetic field B as ${B}^{2}/v.$

Physical Review A•Jul 11, 2003•36 citations
The gain experienced by a weak electromagnetic wave traveling in the opposite direction to a strong wave through a gaseous medium subjected to a sufficiently strong magnetic field is calculated for any values of the angular momenta of dipole transition levels allowing for atomic depolarizing collisions. It is shown that information on all the relaxation characteristics of an atomic transition and on the levels participating in this transition can be obtained using the model of depolarizing collisions.
Abstract For the first time, a complete set of decay parameters, due to collisions of 174 Yb atoms with noble gas atoms and with ytterbium atoms, was experimentally found for the 174 Yb (6s6p) 3 P 1 level. The method of stimulated photon echo with special angles between the polarization vectors of light pulses forming an echo at the 174 Yb (6s 2 ) 1 S 0 —(6s6p) 3 P 1 transition (type 0 ↔ 1 ) is used. For each buffer gas of He, Ne, Ar, Kr, Xe, and Yb, the decay rate constants of population, orientation and alignment for the collision destruction of the 3 P 1 level of 174 Yb atoms are determined. All the decay rates demonstrated their linear increase with a buffer gas pressure, and the corresponding relaxation constants are determined. Each of the indicated relaxation constants, as well as the difference between the alignment and orientation relaxation constants, increases with the increasing buffer gas mass.
A method for quantum-mechanical calculations of cross sections for the Zeeman transitions in collisions of 3P{}^{3}P3P atoms with structureless targets in a magnetic field is presented and applied to the study of magnetic and electronic relaxation in oxygen-helium and carbon-helium collisions at cold and ultracold temperatures. The rate constants for collisionally induced transitions between Zeeman levels in ground-state oxygen have large magnitudes in a 1 T field. It is shown that magnetic fields induce the forbidden 3P1{}^{3}{P}_{1}3P1​ $\ensuremath{\rightarrow}$ 3P0{}^{3}{P}_{0}3P0​ transition in ultracold collisions of carbon with helium. The cross section vanishes at zero energy for field-free collisions, but becomes infinitely large in a finite magnetic field, varying with velocity vvv and magnetic field B as B2/v.{B}^{2}/v.B2/v.