Mechanism of angular momentum exchange between molecules and Laguerre-Gaussian beams

Adrian Alexandrescu*, Dan Cojoc, Enzo Di Fabrizio

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

83 Scopus citations


We derive the interaction Hamiltonian between a diatomic molecule and a Laguerre-Gaussian beam under the assumption of a small spread of the center of mass wave function of the molecule in comparison with the beam waist. Considering the dynamical variables of the center of mass, vibrational, rotational, and electronic motion, we show that, within the electronic dipole approximation, the orbital angular momentum of the field couples with the rotational and electronic motion. The changes in the transition probabilities and selection rules induced by the field orbital angular momentum and the applicability of the derived interaction mechanisms for polyatomic molecules are discussed.

Original languageEnglish (US)
Article number243001
JournalPhysical Review Letters
Issue number24
StatePublished - Jan 1 2006

ASJC Scopus subject areas

  • General Physics and Astronomy


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