期刊
MOLECULAR PHYSICS
卷 114, 期 15, 页码 2217-2231出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00268976.2016.1192233
关键词
Molecular high-order harmonics; spatially inhomogeneous field; attosecond pulses
资金
- National Science Foundation of China [11504151]
- Doctoral Scientific Research Foundation of Liaoning Province [201501123]
- Scientific Research Fund of Liaoning Provincial Education Department [L2014242]
Asymmetric molecular harmonic generation from HeH2+ ion in the presence of the spatially inhomogeneous plasmon-enhanced field has been theoretically investigated by solving the two-dimensional non-Born-Oppenheimer time-dependent Schrodinger equation (both the electron and nuclear motions are considered only along the laser polarisation axis). It shows that (1) for the normal homogeneous field, the harmonic cut-off from the asymmetric molecule is beyond the classical harmonic cut-off energy from the atom (I-p + 3.17 U-p). Further analyses show that the multi-channels ionisation-recombination process is responsible for the harmonic extension. (2) For the spatially inhomogeneous plasmon-enhanced field, the harmonic cut-off can be further enhanced, and an optimal 3.0 dB enhanced field with a 482 eV supercontinuum has been obtained. Quantum time-frequency harmonic analyses have been shown to explain the harmonic characteristics and the harmonic extension process. (3) Initial vibrational state and isotopic effects show that intense harmonics can be generated from higher initial vibrational state and the heavier molecule. Finally, by properly superposing the harmonics, a series of sub-30 as attosecond pulses can be obtained. [GRAPHICS] .
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