摘要
利用精确求解原子核与电子耦合运动的三维含时量子波包法,理论研究了HD+分子在强激光场中的光解离动力学,并给出了量子调控HD+分子光解离通道的理论方案.通过分析HD+分子在不同的初始振动态和激光场强度下的光解离动力学过程及其解离核动能谱,得出了HD+分子的光解离机理及其随激光场强度的变化规律.研究结果表明,利用激光场的强度可以实现HD+分子光解离通道的量子调控.当激光场强度I1=4.0×1013 W/cm2时,HD+分子的光解离主要是通过净单光子吸收解离和净双光子吸收解离;当激光场强度增大到I2=2.0×1014 W/cm2时,直接双光子吸收解离取代了净单光子吸收解离,净双光子吸收解离的比重也下降了.
The dissociation dynamics of HD+ molecule in an intense field is investigated by using an accurate threedimensional time-dependent,wave packet approach.When the 790-nm laser pulse interacts with HD+ molecule,the lowest electronic 1 sσ and 2 pa states are coupled.Due to the existence of the permanent electric dipole moment,the transitions in HD+ molecule involve the direct absorption of an odd and even number of photons,thereby opening different pathways for dissociation.The model of the photon-dressed states is presented to analyze the possible dissociation pathways of HD+ molecule.The laser-induced dissociation of HD+ molecule is mainly composed of the four pathways:the direct one-photon absorption,the net two-photon absorption,the direct two-photon absorption,and the direct two-photon absorption.To reveal the dissociation mechanism of HD+ molecule,the kinetic energy resolved spectra are calculated at the given laser intensities.It is found that the dissociation pathways are strongly dependent on laser intensity,especially for the net one-photon absorption dissociation and direct two-photon absorption dissociation.With further research,the dissociation pathways of HD+ are controlled by regulating the intensity of laser pulse.At,a laser intensity of 4.0 × 1013 W/cm2,the kinetic energy resolved spectrum for the vibrational state v = 3 includes the contributions from the net twophoton absorption dissociation and the direct two-photon absorption dissociation.For the vibrational state v=6,HD+ molecule is preferentially dissociated via the net one-photon absorption.However,the dissociation mechanism of HD+ molecule at the vibrational states v= 3 and v = 6 have significant changes as the laser intensity increases to 2.0 × 1014 W/cm2.For the vibrational state v = 3,the branching ratio between the dissociation pathway of the net two-photon absorption and that of the direct two-photon absorption has a dramatic change with the increase of laser intensity.Compared with the kinetic energy resolved spectra at laser energy
作者
姚洪斌
蒋相站
曹长虹
李文亮
Yao Hong-Bin;Jiang Xiang-Zhan;Cao Chang-Hong;Li Wen-Liang(Laboratory of New Energy and Materials, Xinjiang Institute of Engineering, Urumqi 830091, China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2019年第17期265-271,共7页
Acta Physica Sinica
基金
新疆维吾尔自治区高等学校科研计划项目(批准号:XJEDU2016I051,XJEDU2017M042,XJEDU2018I020)
国家自然科学基金(批准号:11764041,51462034)
新疆维吾尔自治区天山青年计划(批准号:2017Q033,2017Q034)
新疆维吾尔自治区自然科学基金(批准号:2019D01A32)资助的课题~~
关键词
解离
量子调控
含时波包法
核动能谱
dissociation
quantum control
time-dependent wave packet method
kinetic energy resolved spectra
