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Soviet physics. Doklady

Possibility of investigating the structure of resonance transitions by the photon-echo method

Alexander V. Evseev, I. V. Evseev, Решетов Владимир Александрович

Published Mar 1, 1984• 0 citations
OpenAlex

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The possibilities of the reverse photon echo for obtaining information about the relaxation times and the electrical dipole momentum of the resonant transition are investigated experimentally in ruby (resonant transition 4A2–2E(Ē)). A new method based on the many-pulse excitation of the resonant system by a single travelling wave and by a sequence of standing waves, is proposed. As a result, this system irradiates a series of reverse echo signals, from the decay of their intensities it is possible to define the relaxation times in a single series. These relaxation times are measured at different values of the permanent magnetic field. The different apparatus solutions of these experimental problems are discussed.
The Raman photon echo (RPE) in atomic vapour, allowing for depolarising atomic collisions and hyperfine structure of the atomic levels, has been studied theoretically. A new method of determining the electronic and electronic nuclear relaxation rates of the multipole moments of gas atoms with nonzero nuclear spin using the RPE has been proposed. The RPE method also makes it possible to measure the derivatives of these relaxation rates with respect to the impurity gas pressure. A method of determining the energy separation between the hyperfine structure sublevels has been developed. This method is based on the quantum beats of the RPE intensity and may be used when the hyperfine splitting is less than the Doppler linewidth. A possibility of identifying the forbidden transitions in both the electronic and total angular momenta has been shown.