Metastable-state population kinetics

Iu. A. Kulagin, Leonid A. Shelepin

A I Didyukov, Iu. A. Kulagin, S. A. Reshetnyak +1 more

Xiao Jiang Pan

Vladimir Leonardovich Derbov, Leonid A. Melnikov, И. М. Уманский +1 more

Numerical study of the kinetics in metastable antiprotonic helium molecules driven by a sequence of laser \ensuremath{\pi} pulses resonant to the adjacent transitions is carried out. The phenomena taking place are shown to be useful for checking the mechanisms of the depopulation of high-n states, for measuring the populations of the individual energy levels, and for slowing down the decay by means of \ensuremath{\pi}-pulse-induced inversion.

Vladimir Leonardovich Derbov, Leonid A. Melnikov, Natalia I. Teper +1 more

We report the results of numerical modeling of the coherent laser multi-pulse technique, proposed in our earlier papers to measure the population of the metastable states of antiprotonic helium and to control the decay kinetics in the adjacent transition chains. It is demonstrated that a sequence of properly chosen (pi) -pulses may result in a sequence of annihilation spikes whose amplitudes are nearly proportional to the populations of individual metastable states. The limitations related to the pulse duration and delay are studied as well as the role of the lifetime of the short-lived final state.

L. M. Biberman, V. S. Vorob’ev, I. T. Yakubov