Summary: Electric field induced alignment-orientation conversion in diatomic
molecules: analysis and observation for NaK
O. Nikolayeva*, M. Auzinsh, M. Tamanis, R. Ferber
Institute of Atomic Physics and Spectroscopy, Department of Physics, University of Latvia, 19 Rainis blvd., LV-1586, Riga, Latvia
Received 24 August 1998
This article reports the observation of the molecular fluorescence circularity under irradiation with linearly polarised light.
This alignment-orientation conversion phenomenon arises as a result of partial transformation from alignment of the ensemble
P state molecular angular momenta into their orientation under the effect of non-linear dc Stark effect. Circularity rate up to
0.12 was observed in D1
P 3 X1
S fluorescence of 23
K molecules in agreement with the theoretically predicted value.
1999 Elsevier Science B.V. All rights reserved.
Keywords: Alignment-orientation conversion; NaK
As is well known, excitation by linearly polarised
light E, caused by symmetry considerations, is