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Optics and Spectroscopy

Possibility of measuring the relaxation characteristics of multipole moments of optically forbidden transitions by means of modified three-level photon echo

I. V. Evseev, Yu.V. Men'shikova, V. N. Tsikunov

Published Jul 1, 1987• 0 citations
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The modified tri-level photon echo

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A theory is developed for the modified tri-level photon echo formed in gaseous media. Consideration is given to the cases when echo is generated both by atoms for molecules with zero nuclear spin and by atoms with non-zero nuclear spin. In the first case, it is shown that this particular kind of photon echo can be used to measure the relaxation characteristics of the multipole moments of the optically forbidden transition. On the basis of these considerations new experiments are suggested for the observation of the relaxation characteristics mentioned above. In the second case, formulae are obtained for the calculation of pre-exponential factors describing the dependence of the quantum beats of the intensity of the modified tri-level photon echo as a function of the time intervals between the exciting pulses. Values of the pre-exponential factors need to be known in order to correctly obtain spectroscopic information about an optically forbidden transition.

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Stokes three-level echo

A. I. Alekseev, V N Beloborodov, O. V. Zhemerdeev

A method of determining relaxation rates of electronic and electronic nuclear multipole moments of gas atoms with non-zero nuclear spin, using the Stokes three-level echo (STE) and the photon echo (PE), has been proposed. This method utilises the polarisation properties and damping laws of the STE and PE on the inhomogeneously broadened transitions. Correct account was taken of the hyperfine structure (HFS) of the atomic levels and of the effect of the depolarising atomic collisions. The STE polarisation properties found have also been assumed to be a basis method for the identification of optically forbidden transitions in total angular momentum.

Journal of Physics B Atomic Molecular and Optical Physics•Aug 14, 1989•2 citations
A theory is developed for the modified tri-level photon echo formed in gaseous media. Consideration is given to the cases when echo is generated both by atoms for molecules with zero nuclear spin and by atoms with non-zero nuclear spin. In the first case, it is shown that this particular kind of photon echo can be used to measure the relaxation characteristics of the multipole moments of the optically forbidden transition. On the basis of these considerations new experiments are suggested for the observation of the relaxation characteristics mentioned above. In the second case, formulae are obtained for the calculation of pre-exponential factors describing the dependence of the quantum beats of the intensity of the modified tri-level photon echo as a function of the time intervals between the exciting pulses. Values of the pre-exponential factors need to be known in order to correctly obtain spectroscopic information about an optically forbidden transition.
A method of determining relaxation rates of electronic and electronic nuclear multipole moments of gas atoms with non-zero nuclear spin, using the Stokes three-level echo (STE) and the photon echo (PE), has been proposed. This method utilises the polarisation properties and damping laws of the STE and PE on the inhomogeneously broadened transitions. Correct account was taken of the hyperfine structure (HFS) of the atomic levels and of the effect of the depolarising atomic collisions. The STE polarisation properties found have also been assumed to be a basis method for the identification of optically forbidden transitions in total angular momentum.