Near-threshold high-order harmonic spectroscopy with aligned molecules

We study high-order harmonic generation in aligned molecules close to the ionization threshold. Two distinct contributions to the harmonic signal are observed, which show very different responses to molecular alignment and ellipticity of the driving field. We perform a classical electron trajectory...

Full description

Saved in:
Bibliographic Details
Published inPhysical review letters Vol. 105; no. 14; p. 143904
Main Authors Soifer, H, Botheron, P, Shafir, D, Diner, A, Raz, O, Bruner, B D, Mairesse, Y, Pons, B, Dudovich, N
Format Journal Article
LanguageEnglish
Published United States 01.10.2010
Online AccessGet more information

Cover

More Information
Summary:We study high-order harmonic generation in aligned molecules close to the ionization threshold. Two distinct contributions to the harmonic signal are observed, which show very different responses to molecular alignment and ellipticity of the driving field. We perform a classical electron trajectory analysis, taking into account the significant influence of the Coulomb potential on the strong-field-driven electron dynamics. The two contributions are related to primary ionization and excitation processes, offering a deeper understanding of the origin of high harmonics near the ionization threshold. This Letter shows that high-harmonic spectroscopy can be extended to the near-threshold spectral range, which is in general spectroscopically rich.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.105.143904