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Physical Review A

Spectra of molecular gases trapped in deep optical lattices

P. F. Barker, Simon M. Purcell, Mikhail N. Shneider

Published Jun 9, 2008• 9 citations
Publisher

Abstract

We study the spectral profile of Rayleigh scattered light from molecular species trapped in optical lattices created by strong fields in the ${10}^{16}\text{ }\text{W}\text{ }{\text{m}}^{\ensuremath{-}2}$ range. We show that, for lattices with well depths on the order of 100 K, the motional sidebands imparted on spectra are shifted from the central Dicke-narrowed Rayleigh peak by hundreds of MHz. Our calculations for these short duration (30 ns) lattices show that these spectral features appear even in room temperature gases suggesting a new technique for measuring gas composition based on the frequency offset of the sidebands. Finally, we study the role of field-induced molecular alignment within the lattice and calculate its effect on the shape and position of the sidebands.

DOI
10.1103/physreva.77.063409

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We study the spectral profile of Rayleigh scattered light from molecular species trapped in optical lattices created by strong fields in the 1016 W m\ensuremath−2{10}^{16}\text{ }\text{W}\text{ }{\text{m}}^{\ensuremath{-}2}1016 W m\ensuremath−2 range. We show that, for lattices with well depths on the order of 100 K, the motional sidebands imparted on spectra are shifted from the central Dicke-narrowed Rayleigh peak by hundreds of MHz. Our calculations for these short duration (30 ns) lattices show that these spectral features appear even in room temperature gases suggesting a new technique for measuring gas composition based on the frequency offset of the sidebands. Finally, we study the role of field-induced molecular alignment within the lattice and calculate its effect on the shape and position of the sidebands.
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We describe a new optical diagnostic for determining the composition of gases by measuring the motion of atoms and molecules trapped within very deep optical lattices. This non-resonant method is analogous to conventional Raman scattering, except that the observed spectral features relate to the oscillatory center-of-mass motion of each species within the lattice, determined uniquely by their respective polarizability-to-mass ratio. Depending on the density of the probed sample, detection occurs either via optical scattering at the high end or via non-resonant ionization at the lower end. We show that such a technique is complementary to conventional mass spectrometry techniques and envision its implementation in existing instruments.
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