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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Published on: February 4, 2017

Probing polar molecules with high harmonic spectroscopy.

E Frumker1, N Kajumba, J B Bertrand

  • 1Joint Attosecond Science Laboratory, University of Ottawa and National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada. eugene.frumker@mpq.mpg.de

Physical Review Letters
|February 2, 2013
PubMed
Summary
This summary is machine-generated.

Researchers used high harmonic spectroscopy to study the phase difference of attosecond bursts from polar molecules. This technique reveals molecular orientation and advances the theory of high harmonic generation.

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Area of Science:

  • Attosecond science
  • Molecular spectroscopy
  • Quantum optics

Background:

  • High harmonic spectroscopy (HHS) probes ultrafast electron dynamics.
  • Polar molecules exhibit unique electronic properties due to charge asymmetry.
  • Understanding electron recollision dynamics is crucial for attosecond science.

Purpose of the Study:

  • To experimentally compare the phase difference of attosecond bursts from different ends of a polar molecule.
  • To determine the degree of molecular orientation and the phase difference of attosecond bursts.
  • To investigate the impact of phase differences on harmonic generation in polar molecules.

Main Methods:

  • Combining molecular orientation techniques with phase-sensitive high harmonic spectroscopy.
  • Irradiating carbon monoxide (CO) molecules with intense laser fields.
  • Measuring the amplitude ratio of even to odd harmonics.

Main Results:

  • Observed suppression of harmonic emission parallel to the laser field and enhancement perpendicular to it.
  • Quantified the degree of molecular orientation and the attosecond burst phase difference.
  • Demonstrated the sensitivity of HHS to subtle phase differences in emitted radiation.

Conclusions:

  • High harmonic spectroscopy is a powerful probe for studying polar molecules.
  • The findings advance the understanding of electron recollision dynamics in oriented molecules.
  • This work will drive progress in the theoretical framework of high harmonic generation.