Field-free molecular alignment of carbon dioxide molecules measured with above-threshold ionization yields


CANADIAN JOURNAL OF PHYSICS, vol.98, no.4, pp.390-394, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 98 Issue: 4
  • Publication Date: 2020
  • Doi Number: 10.1139/cjp-2019-0361
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Chemical Abstracts Core, Communication Abstracts, Compendex, Computer & Applied Sciences, Environment Index, Metadex, zbMATH, Civil Engineering Abstracts
  • Page Numbers: pp.390-394
  • Çanakkale Onsekiz Mart University Affiliated: Yes


We present measurements of above-threshold ionization (ATI) of CO2 in a pump-probe experiment where the pump pulse creates a rotational wave packet and the linearly polarized probe pulse generates the ATI spectrum as a function of the pump-probe delay time, which sweeps over the revival time of field-free alignment and its quarter fractions. The observed alignment signals, which are the electron yields of ATI by a probe pulse as a function of a delay between the pump and probe pulse, are compared with the calculated alignment parameter << cos(2) theta >>. The results are explained by nuclear spin statistics and the wave packet evolution of the CO2 molecule in terms of the highest occupied molecular orbital.