红外激光与远紫外激光场驱动H2+辐射谐波

为了了解H₂+谐波辐射的过程，采用数值求解非玻恩-奥本海默近似薛定谔方程的方法，理论研究了H₂+在10fs/800nm红外激光与6fs/30nm远紫外激光驱动下谐波辐射的特点。结果表明，谐波辐射的贡献主要来源于拉比振荡、多光子共振电离、电荷共振增强电离以及离解态电离；随着远紫外光的加入，谐波光谱呈现能量间隔为远紫外光子能量的多重谐波截止结构；当远紫外光与红外激光的延迟时间大于零或小于零时，谐波光谱呈现红移和蓝移的现象。该研究对理解分子谐波辐射过程是有帮助的。

H2+ radiation harmonics driven by infrared and extreme ultraviolet field

In order to understand H₂+ harmonic emission process, by using numerical solution of non-Bohn-Oppenheimer time-dependent Schr?dinger equation, high-order harmonic generation (HHG) from H₂+ driven by 10fs/800nm infrared (IR) field and 6fs/30nm extreme ultraviolet (XUV) pulse was theoretically investigated. The results show that, the contributions of HHG are mainly from Rabi-type oscillation, multi-photon resonance ionization, charge-resonance-enhanced ionization and dissociative ionization. With the introduction of XUV pulse, multi-harmonic cutoff extension separated by XUV photon energy can be found on HHG spectra. When the delay time between IR field and XUV pulse is larger than zero or smaller than zero, the red-shift and blue-shift of harmonics spectra can be obtained. The investigation is helpful to understand the molecular high-order harmonic generation.