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

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
31 Downloads (Pure)


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
Issue number13
Early online date30 Jun 2023
Publication statusPublished - 14 Jul 2023


  • high harmonic generation
  • ab initio calculations


Dive into the research topics of 'Modelling intensity volume averaging in ab initio calculations of High Harmonic Generation'. Together they form a unique fingerprint.

Cite this