Modelling intensity volume averaging in ab initio calculations of High Harmonic Generation

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Abstract

We present an approach to assess the survival of single-atom effects in the macroscopic high-harmonic generation (HHG) spectrum, by accounting for focal volume averaging. We apply this technique to R-matrix with time-dependence (RMT) studies, which are designed to include the full multielectron response of an atom. Such an approach allows the assessment of which features of an experimentally-measured HHG spectrum of diffuse gases may be traced directly to single-atom effects and vice-versa. While accounting for the phase of harmonics produced at different locations in the focal volume gives the most accurate results, a simplified approach, using a smaller number of RMT calculations, is found to provide comparable conclusions. We apply these approaches to compute intensity-averaged harmonic spectra in two different experimental regimes.
Original languageEnglish
Article number 135402
Number of pages9
JournalJournal of Physics B: Atomic Molecular and Optical Physics
Volume56
Issue number13
Early online date30 Jun 2023
DOIs
Publication statusPublished - 14 Jul 2023

Keywords

  • high harmonic generation
  • ab initio calculations

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