The Cooper minimum (CM) has been studied using high harmonic generation solely in atoms. Here, we present detailed experimental and theoretical studies on the CM in molecules probed by high harmonic generation using a range of near-infrared light pulses from λ = 1.3 to 1.8 µm. We demonstrate the CM to occur in CS₂ and CCl₄ at ~42 and ~40 eV, respectively, by comparing the high harmonic spectra with the known partial photoionization cross sections of different molecular orbitals, confirmed by theoretical calculations of harmonic spectra. We use CM to probe electron localization in Cl-containing molecules (CCl₄, CH₂Cl₂, and trans-C₂H₂Cl₂) and show that the position of the minimum is influenced by the molecular environment.
M. C. Wong et al., "High Harmonic Spectroscopy of the Cooper Minimum in Molecules," Physical Review Letters, vol. 110, no. 3, American Physical Society (APS), Jan 2013.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.110.033006
Keywords and Phrases
Cooper Minima; Electron Localizations; Harmonic Spectrum; High Harmonic Generation; High Harmonics; Molecular Environment; Near Infrared Light; Partial Photoionization; Theoretical Calculations; Theoretical Study, Molecular Orbitals, Molecules
International Standard Serial Number (ISSN)
Article - Journal
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