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Journal of Physics B Atomic Molecular and Optical Physics

Lineshape variations of two-photon transitions based on quantum interference in Na2

Weisheng Wang, Le Deng, Zhenrong Sun, Liangen Ding, Zugeng Wang

Published May 26, 2000• 0 citations
Publisher

Abstract

We report the lineshape variations of two-photon transitions in a rhomb-type four-level system in sodium dimer. A straightforward explanation is given by performing theoretical analysis and calculation.
DOI
10.1088/0953-4075/33/11/311

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We report the first observation of molecular population trapping in a pair of coupled upper or coupled intermediate levels in Y-type or rhomb-type four-level systems, respectively. The demonstrations were done by means of equal-frequency two-photon excitations at about 587 and 640 run in sodium dimers. The mentioned coupled levels consist of a pair of wavefunction mixing levels due to spin-orbital perturbation with typical separation of a few GHz. The characteristic of the molecular trapping in a Y- type system was a strong extra UV excitation fluorescence peak against null visible emission in the middle between the two allowed two-photon absorption peaks. On the contrast, a pair of singlet-triplet mixing intermediate levels in a rhomb-type four-level system might provide significant destructive quantum interference for a two- photon transition, depending on their relative offsets. The characteristic of molecular population trapping in a rhomb-type four- level system was only two pieces of residual signals observable al the sides after completely eliminated of the center part of the two-photon lineshape.