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Frontiers in Optics

CW all-Optical Quadruple Resonance Spectroscopy and Transition Dipole Measurements of Sodium Dimer

Ergin H. Ahmed, Peng Qi, Marjatta Lyyra

Published Jan 1, 2006• 0 citations
Publisher

Abstract

We report CW all-optical quadruple resonance excitation experiment with all excitations steps driven coherently by a combination of four tunable lasers. This excitation technique is very general allowing access to transitions at large internuclear distance.
DOI
10.1364/fio.2006.jwd119

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A technique is described for high-resolution spectroscopy using resonance absorption from a laser to monitor the time evolution of a coherently excited superposition of atomic states. As a demonstration a measurement was made of the 32P123^{2}P_{\frac{1}{2}}32P21​​ hyperfine splitting in sodium.
Electron scattering by excited sodium atoms has been carried out in a crossed-beam experiment. The atoms have been optically pumped into a well defined hyperfine level (3 2 P 3 2/F=3) by a tunable CW dye laser. For two of the most prominent scattering processes, the 3 2 P to 3 2 S and 3 2 P to 4 2 S transitions, the effect of the anisotropy of the initial state introduced by the laser light is studied in detail and is interpreted in terms of multipole moments describing the optical excitation and the collision process. Possibilities and limitations of the experiment are discussed. Electron collisions may be seen as a test case for the understanding of more involved interaction processes.