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Physical Review A

Collisional excitation transfer in high magnetic fields. II. Correlation function of the interaction in H(6P13)−Hg(6S01) collisions

J. C. Gay, Werner B. Schneider

Published Sep 1, 1979• 9 citations
Publisher

Abstract

The authors report results of the experimental study of excitation transfer between Zeeman sublevels of the $6^{3}P_{1}$ state of an even isotope of mercury in magnetic fields up to 80 kG, obtained by monitoring the transition from sudden to partially adiabatic collisions. The results are shown to be in good agreement with theoretical evaluations based on a numerical solution of the relaxation problem or on a correlation-function description using a ${R}^{\ensuremath{-}3}$ dipole-dipole interaction.

DOI
10.1103/physreva.20.894

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The study of Hg* (6 3P1)-rare gas collisions in a 200 kG range of magnetic field is reported. The results show that the collisional transfer rates between the m = 0 and the m = ± 1 Zeeman sublevels of an even isotope of mercury exhibit a strikingly different dependence on the field strength according to the noble gas species. A very qualitative attempt at interpretation is given using the results of a previous theoretical model which predicts a strong anisotropy of the relaxation process when the vapour is submitted to such magnetic fields.
An experimental study of excitation transfer between certain Zeeman sublevels of the 32PJ3^{2}P_{J}32PJ​ states in strong magnetic fields is reported for $\mathrm{Na}(3^{2}S_{\frac{1}{2}})\ensuremath{-}{\mathrm{Na}}^{*}(3^{2}P_{J})$ resonant collisions. A major decrease in the $M=\ensuremath{-}\frac{3}{2}\ensuremath{\rightarrow}M=\frac{3}{2}$ transfer rate is observed between 4 and 80 kG. Approximate calculations in the correlation-function framework are performed, and the experimental results and theoretical predictions for the field dependence are in good agreement. Some insights into the mechanisms of the collision process are deduced and the particularly important role of the electronic spin is emphasized. The importance of the symmetry properties of the interaction potential is also directly demonstrated.
The effects of strong magnetic fields on thermal collisions in a vapor are reviewed. Semiclassical and quantum-mechanical symmetry properties of the relaxation matrix are established for resonant collisions between identical atoms and nonresonant collisions with a structureless partner. The variations with field strength of the transfer rates between Zeeman sublevels for ${R}^{\ensuremath{-}3}$ dipole-dipole interaction and ${R}^{\ensuremath{-}6}$ Van der Waals interaction are obtained with an exact semiclassical computation of the collision matrix. These are then compared with those predicted with an approximate formulation by means of the symmetrical correlation function for the potential.
The cross section for the transition $6^{3}P_{0}\ensuremath{\rightarrow}6^{3}P_{1}$ in mercury, induced in collisions with N2{\mathrm{N}}_{2}N2​ molecules, has been determined by the method of delayed coincidences. The Hg 3P1^{3}P_{1}3P1​ state was excited by pulses of 2537-\AA{} Hg resonance radiation and the decay of the long-lived 2537-\AA{} afterglow was studied in relation to N2{\mathrm{N}}_{2}N2​ pressure. The resulting cross section ${Q}_{12}(^{3}P_{0}\ensuremath{\rightarrow}^{3}P_{1})=4.18\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ A˚2{\mathrm{\AA{}}}^{2}A˚2 was found to be good agreement with the prediction of the principle of detailed balancing when compared with the cross section ${Q}_{21}(^{3}P_{1}\ensuremath{\rightarrow}^{3}P_{0})$. It was also found that, within the sensitivity of the method, collisions with N2{\mathrm{N}}_{2}N2​ molecules do not quench 3P1^{3}P_{1}3P1​ or 3P0^{3}P_{0}3P0​ Hg atoms to the ground state.
The zero-field level-crossing signal of even isotopes of natural Hg excited by resonant collisions from directly excited Hg198{\mathrm{Hg}}^{198}Hg198 atoms has been observed with circularly polarized light. The signal is proportional to the atomic "orientation" (mean value of the angular momentum of the excited atoms). The sense of this orientation is reversed when the excitation is transferred by collisions from Hg198{\mathrm{Hg}}^{198}Hg198 to other isotopes, as predicted by the theory.