We experimentally investigated the high-order harmonic generation(HHG)from aligned O_(2) and N_(2) molecules in a linearly polarized laser field,and presented the dependence of the harmonic spectrum on the driving las...We experimentally investigated the high-order harmonic generation(HHG)from aligned O_(2) and N_(2) molecules in a linearly polarized laser field,and presented the dependence of the harmonic spectrum on the driving laser intensity and molecular alignment angle.The minimum position of HHG of O_(2) varies with changing the laser intensity,which is caused by multi-orbital interference.However,the location of the observed minimum structure in N_(2) harmonic spectrum remained unchanged upon changing the laser intensity.The mechanism of the spectral minimum for N_(2) case is regarded as a Cooperlike minimum in HHG associated with the molecular electronic structure.This work indicates that harmonic spectroscopy can effectively uncover information about molecular structure and electron dynamics.展开更多
The orientation-dependent single ionization rate of the diatomic molecular ion H2 + with different active orbitals in an intense field is studied by using S-matrix theory.Our results show that the orientation-dependen...The orientation-dependent single ionization rate of the diatomic molecular ion H2 + with different active orbitals in an intense field is studied by using S-matrix theory.Our results show that the orientation-dependent single ionization probability of H2 + is greatly dependent on the symmetry and the electron density distribution of its initial states,and it can be used to identify the excited state of the molecular ion in the dissociation process.展开更多
基金Project supported by the National Key Research and Development Program of China(Grant No.2019YFA0307700)the National Natural Science Foundation of China(Grant Nos.91750104 and 11974137)the Natural Science Foundation of Jilin Province,China(Grant No.YDZJ202101ZYTS157).
文摘We experimentally investigated the high-order harmonic generation(HHG)from aligned O_(2) and N_(2) molecules in a linearly polarized laser field,and presented the dependence of the harmonic spectrum on the driving laser intensity and molecular alignment angle.The minimum position of HHG of O_(2) varies with changing the laser intensity,which is caused by multi-orbital interference.However,the location of the observed minimum structure in N_(2) harmonic spectrum remained unchanged upon changing the laser intensity.The mechanism of the spectral minimum for N_(2) case is regarded as a Cooperlike minimum in HHG associated with the molecular electronic structure.This work indicates that harmonic spectroscopy can effectively uncover information about molecular structure and electron dynamics.
基金Project supported by the National Natural Science Foundation of China (Grant No.10674087)the National Basic Research Program of China (Grant No.2006CB806000)+2 种基金the Hebei Provincial Natural Science Foundation (Grant No.A2008000136)the Project of National Center for Educational Techonology of the Ministry of Education of China (Grant NCET-08-0883)the Program of TYAl of Shanxi Province and China Academy of Engineering Physics Foundation (Grant No.2008B0102007)
文摘The orientation-dependent single ionization rate of the diatomic molecular ion H2 + with different active orbitals in an intense field is studied by using S-matrix theory.Our results show that the orientation-dependent single ionization probability of H2 + is greatly dependent on the symmetry and the electron density distribution of its initial states,and it can be used to identify the excited state of the molecular ion in the dissociation process.
