English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The selection rules of high harmonic generation (HHG) are investigated usingthree-dimensional time-dependent density functional theory (TDDFT). From theharmonic spectra obtained with various real molecules and different forms oflaser fields, several factors that contribute to selection rules are revealed.Extending the targets to stereoscopic molecules, it is shown that the allowedharmonics are dependent on the symmetries of the projections of molecules. Forlaser fields, the symmetries contributing to the selection rules are discussedaccording to Lissajous figures and their dynamical directivities. All thephenomena are explained by the symmetry of the full time-dependent Hamiltonianunder a combined transformation. We present a systematic study on the selectionrules and propose an intuitive method for the judgment of allowed harmonicorders, which can be extended to more complex molecules and various forms oflaser pulses.

The selection rules of high harmonic generation: the symmetries of molecules and laser fields