Molecular high-order harmonic spectra and its application to the generation of the isolated attosecond pulse

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• 作者：Li-Qiang Feng ; Hang Liu ; Wenliang Li ; Rich-Samuel Castle
• 关键词：Attosecond pulse ; Half ; cycle pulse ; Internuclear distance R ; Molecular high ; order harmonic spectra ; Spatial inhomogeneous effect
• 刊名：Journal of Molecular Modeling
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：22
• 期：12
• 全文大小：5,387 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Computer Applications in Chemistry
  Biomedicine
  Molecular Medicine
  Health Informatics and Administration
  Life Sciences
  Computer Application in Life Sciences
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：0948-5023
• 卷排序：22

文摘

Molecular high-order harmonic generation (HHG) spectra from H₂+ and its application to the generation of the isolated attosecond pulses (IAPs) have been numerically investigated. Results show that (i) the 7th harmonic order is enhanced with the nuclei around the equilibrium internuclear, and as the internuclear distance increased, this enhanced harmonic produces a red-shift (even disappearance). Theoretical analyses show that the electronic transition between the ground and the 1st excited states is responsible for the red-shift enhanced harmonic. (ii) The harmonic spectra exhibit several maxima and minima, and a red-shift of these points is predicted as the internuclear distance increased. (iii) By properly choosing the internuclear distance, the harmonic yield is enhanced, and there is only the single quantum path contributing to the harmonic spectra. (iv) Further, by properly adding the half-cycle pulse as well as the spatial inhomogeneous effect, a 375 eV supercontinuum with a pulse enhancement of 3.9 dB and some attosecond X-ray pulses shorter than 60as can be produced.