aqora

Atomic and molecular fluorescence with long radiative decay times from laser excited Na2

F. K�nig, H.G. Weber

The European Physical Journal ADec 1, 19793 citations

Polarization effects and depolarizing collisions in atomic vapour and molecular gas

Хворостов Евгений Борисович, Н. Н. Рубцова, В. Н. Ищенко +3 more

Polarization effects in gases are investigated by two methods of coherent spectroscopy - stimulated photon echo in molecular gas and laser-induced fluorescence in atomic vapour. A well developed photon echo experimental technique permitted us not only to measure relaxation rates of population, orientation and alignment on degenerated resonant levels in molecular gas but also to study their dependence on particles' longitudinal velocity. The degree of polarization of laser-induced fluorescence in Yb vapour in a mixture with Xe proves a large contribution of depolarizing collisions. The complicated non-exponential fluorescence decay at higher Yb pressures is explained by the radiation trapping.Polarization effects in gases are investigated by two methods of coherent spectroscopy - stimulated photon echo in molecular gas and laser-induced fluorescence in atomic vapour. A well developed photon echo experimental technique permitted us not only to measure relaxation rates of population, orientation and alignment on degenerated resonant levels in molecular gas but also to study their dependence on particles' longitudinal velocity. The degree of polarization of laser-induced fluorescence in Yb vapour in a mixture with Xe proves a large contribution of depolarizing collisions. The complicated non-exponential fluorescence decay at higher Yb pressures is explained by the radiation trapping.

Journal of Optics B Quantum and Semiclassical OpticsApr 1, 20010 citations

Collisional Depolarization of Resonance Fluorescence

Lue Yung-Chow Chiu

peacJan 1, 19690 citations

Nonexponential fluorescence decay of polyatomic molecules

Emile S. Medvedev

Uspekhi Fizicheskih NaukJan 1, 19913 citations

Theory of quantum beats: Master equation approach

Hirohiko Kono, Yuichi Fujimura, S. H. Lin

Based on the master equation approach, an expression for the time dependent fluorescence intensity has been derived taking into account both collision effects resulting from the elastic and inelastic scattering from the heat bath and the statistical properties of the incident light. The degree of coherence for the molecular eigenstates is defined. The pure dephasing constant between the excited states attenuates the degree of coherence for the molecular eigenstates during and after the light pulse duration; on the other hand, the pure dephasing between the ground and excited states attenuates it during the pulse duration. A separable nonstationary correlation function for the incident radiation field is introduced to investigate the effects of the field coherence on the time dependent fluorescence. Model calculations of the quantum beats in the fluorescence from molecules with two levels in the excited state in the weak radiation field have been performed to demonstrate the effects of the dephasing constants and the field coherence as well as those of the population decay constants.Based on the master equation approach, an expression for the time dependent fluorescence intensity has been derived taking into account both collision effects resulting from the elastic and inelastic scattering from the heat bath and the statistical properties of the incident light. The degree of coherence for the molecular eigenstates is defined. The pure dephasing constant between the excited states attenuates the degree of coherence for the molecular eigenstates during and after the light pulse duration; on the other hand, the pure dephasing between the ground and excited states attenuates it during the pulse duration. A separable nonstationary correlation function for the incident radiation field is introduced to investigate the effects of the field coherence on the time dependent fluorescence. Model calculations of the quantum beats in the fluorescence from molecules with two levels in the excited state in the weak radiation field have been performed to demonstrate the effects of the dephasing constants and the field coherence as well as those of the population decay constants.

The Journal of Chemical PhysicsSep 15, 198132 citations

Polarization of atomic fluorescence excited by molecular photodissociation

J. Vigué, Alain Aspect, Philippe Grangier +3 more

Jan 1, 19840 citations

A new molecular fluorescence depolarization effect: The coherence decay time of NO2

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