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Springer eBooks

Emission, Absorption and Scattering of Light by Atomic Systems

D. I. Blokhint︠s︡ev

Published Jan 1, 1964• 0 citations
Publisher
DOI
10.1007/978-94-010-9711-6_15

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The study of spectral line shapes has traditionally been mainly concerned with the measurement and interpretation of absorption or emission profiles. Often only the line widths are studied. The present investigation has the objective to evaluate the additional information which can be obtained by scattering light (usually from a laser) from an atomic system which is being perturbed by collisions. A scattering experiment is discussed. The scattered light consists of two components, a (coherent) Rayleigh component and a redistributed (fluorescent) component. In order to obtain the absorption spectrum, questions regarding the probability of photon absorption are considered. By observing the fluorescence subsequent to absorption during a collision it is found possible to obtain information on the evolution of the system from the point of absorption to the completion of the collision. The information on the intracollisional evolution is the justification for the title of the study, namely 'Why half a collision is better than a whole one'.

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Light scattering by an ultracold trapped atom

Mariusz Gajda, Piotr Krekora, Jan Mostowski

We study the scattering of light by a single ultracold trapped atom initially in the ground state of the trapping harmonic potential. We have found interesting features of scattering in the regime where the atomic recoil energy is much larger than the separation between oscillatory trap levels. Although we present the quantum-mechanical expression for the scattering cross section, special attention is paid to the semiclassical analysis of the process. We show that the major characteristics of the scattering might be deduced from two conservation laws: conservation of energy and momentum in absorption and emission of photon process separately. These conservation laws impose a strong correlation between scattered light characteristics and the position of the trapped atom at the moment of photon emission. \textcopyright{} 1996 The American Physical Society.

Physical Review A•Jul 1, 1996•3 citations
The study of spectral line shapes has traditionally been mainly concerned with the measurement and interpretation of absorption or emission profiles. Often only the line widths are studied. The present investigation has the objective to evaluate the additional information which can be obtained by scattering light (usually from a laser) from an atomic system which is being perturbed by collisions. A scattering experiment is discussed. The scattered light consists of two components, a (coherent) Rayleigh component and a redistributed (fluorescent) component. In order to obtain the absorption spectrum, questions regarding the probability of photon absorption are considered. By observing the fluorescence subsequent to absorption during a collision it is found possible to obtain information on the evolution of the system from the point of absorption to the completion of the collision. The information on the intracollisional evolution is the justification for the title of the study, namely 'Why half a collision is better than a whole one'.
We study the scattering of light by a single ultracold trapped atom initially in the ground state of the trapping harmonic potential. We have found interesting features of scattering in the regime where the atomic recoil energy is much larger than the separation between oscillatory trap levels. Although we present the quantum-mechanical expression for the scattering cross section, special attention is paid to the semiclassical analysis of the process. We show that the major characteristics of the scattering might be deduced from two conservation laws: conservation of energy and momentum in absorption and emission of photon process separately. These conservation laws impose a strong correlation between scattered light characteristics and the position of the trapped atom at the moment of photon emission. \textcopyright{} 1996 The American Physical Society.