High-order harmonic generation by aligned homonuclear diatomic cations

被引:4
作者
Milosevic, Dejan B. [1 ,2 ]
Habibovic, Dino [1 ]
机构
[1] Univ Sarajevo, Fac Sci, Zmaja Od Bosne 33-35, Sarajevo 71000, Bosnia & Herceg
[2] Acad Sci & Arts Bosnia & Herzegovina, Bistrik 7, Sarajevo 71000, Bosnia & Herceg
关键词
PULSE TRAINS; LASER;
D O I
10.1039/d3cp02447d
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We introduce the theory of high-order harmonic generation by aligned homonuclear diatomic cations using a strong-field approximation. The target cation is represented as a system which consists of two atomic (ionic) centres and one active electron, while the driving field is either a monochromatic or bichromatic field. For a linearly polarised driving field, we investigate the differences between the harmonic spectra obtained with a neutral molecule and the corresponding molecular cation. Due to the larger ionisation potential, the molecular cations can withstand much higher laser-field intensity than the corresponding neutral molecule before the saturation effects become significant. This allows one to produce high-order harmonics with energy in the water-window interval or beyond. Also, the harmonic spectrum provides information about the structure of the highest-occupied molecular orbital. In order to obtain elliptically polarised harmonics, we suggest that an orthogonally polarised two-colour field is employed as a driving field. In this case, we analyse the harmonic ellipticity as a function of the relative orientation of the cation in the laser field. We show that the regions with large harmonic ellipticity in the harmonic energy-orientation angle plane are the broadest for cations whose molecular orbital does not have a nodal plane. Finally, we show that the molecular cations exposed to an orthogonally polarised two-colour field represent an excellent setup for the production of elliptically polarised attosecond pulses with a duration shorter than 100 as. We introduce the theory of high-order harmonic generation by homonuclear diatomic cations. The elliptically polarised harmonics can be produced using the orthogonal two-colour field and the cations whose molecular orbital does not have nodal planes.
引用
收藏
页码:28848 / 28860
页数:13
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