物理学报
物理學報
물이학보
2013年
7期
176-181
,共6页
田原野%郭福明%杨玉军?
田原野%郭福明%楊玉軍?
전원야%곽복명%양옥군?
阈上电离%离子势影响%中红外激光脉冲
閾上電離%離子勢影響%中紅外激光脈遲
역상전리%리자세영향%중홍외격광맥충
above threshold ionization%influence of ionic potential%mid-infrared laser pulses
本文从理论上分别研究了长程和短程原子势对阈上电离光电子谱平台结构的影响.发现在相当大的激光参数范围内,长程势的阈上电离谱总是呈现出清晰的双平台结构;对于短程势,阈上电离谱双平台的界限不再清晰,随着入射激光强度的减小,逐渐从双平台过渡到单平台.基于经典分析和量子力学数值模拟,阐明了在不同模型势下,电离速率的差别和再散射电子弹性碰撞截面的不同导致了上述平台结构的差异.此外,还讨论了激光脉冲空间强度分布对这一现象的影响.
本文從理論上分彆研究瞭長程和短程原子勢對閾上電離光電子譜平檯結構的影響.髮現在相噹大的激光參數範圍內,長程勢的閾上電離譜總是呈現齣清晰的雙平檯結構;對于短程勢,閾上電離譜雙平檯的界限不再清晰,隨著入射激光彊度的減小,逐漸從雙平檯過渡到單平檯.基于經典分析和量子力學數值模擬,闡明瞭在不同模型勢下,電離速率的差彆和再散射電子彈性踫撞截麵的不同導緻瞭上述平檯結構的差異.此外,還討論瞭激光脈遲空間彊度分佈對這一現象的影響.
본문종이론상분별연구료장정화단정원자세대역상전리광전자보평태결구적영향.발현재상당대적격광삼수범위내,장정세적역상전리보총시정현출청석적쌍평태결구;대우단정세,역상전리보쌍평태적계한불재청석,수착입사격광강도적감소,축점종쌍평태과도도단평태.기우경전분석화양자역학수치모의,천명료재불동모형세하,전리속솔적차별화재산사전자탄성팽당절면적불동도치료상술평태결구적차이.차외,환토론료격광맥충공간강도분포대저일현상적영향.
We investigate theoretically the influence of the long-range and short-range potentials on the plateau structure of the above threshold ionization. In a considerable range of laser parameter, the above threshold ionization spectra of the atoms in the long-range potential always exhibit a clear double-plateau structure; as for the atoms with a short-range potential, the boundary of the double-plateau in photoelectron spectra is no longer clear, and with the decrease of laser intensity, it transits from the double-plateau to the single-plateau gradually. The numerical simulation based on classical analysis and quantum mechanics illustrates that in different model potentials, the distinction of ionization rates as well as the difference of the electronic elastic rescattering cross-sections results in the difference of plateau structures. In addition, the influence of intensity distribution of laser pulse on the phenomenon is discussed.