Two-center minima in harmonic spectra from aligned polar molecules

Details Two-center minima in harmonic spectra from aligned polar molecules Two-center minima in harmonic spectra from aligned polar molecules

2011-06-21

arxiv.org/abs/1106.4123v1

Physics

Atomic Physics

Scientific paper

10.1103/PhysRevA.84.023418

We extend a model of two-center interference to include the superposition of opposite orientations in aligned polar molecules. We show that the position of the minimum in the harmonic spectrum from both aligned and oriented CO depends strongly on the relative recombination strength at different atoms, not just the relative phase. We reinterpret the minimum in aligned CO as an interference between opposite orientations, and obtain good agreement with numerical calculations. Inclusion of the first-order Stark effect shifts the position of the interference minimum in aligned CO even though aligned molecules do not posses total permanent dipoles. We explain the shift in terms of an extra phase that the continuum electron of oriented CO accumulates due to the Stark effect.

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