CAJ | 학술논문

强磁场下的重粒子碰撞激发过程是重要的非弹性碰撞过程,但相关研究还几乎是空白.应用经典蒙特卡洛的方法在得到无磁场下He2++H(1s)的碰撞激发截面的基础上,详细研究了不同强度的纵向和横向强磁场环境下到不同主量子数n和磁量子数m的碰撞激发过程的态选择截面.同时用非微扰量子方法,得到了强磁场下靶原子的能级,并分析了其随磁场强度变化的原因.对碰撞过程发现由于磁场的引入导致到不同m态的激发截面有较大的分离,同时在较低入射能区的态选择截面变化行为与磁场方向有很大关系,这与能级变化及横向强磁场所特有的抗磁项的相互竞争有密切联系.通过对有关事例、径迹的分析,解释了这些变化形成的原因.也发现由于核的运动,沿磁场方向的轨道角动量并非绝对守恒,而有微小的变化.
강자장하적중입자팽당격발과정시중요적비탄성팽당과정,단상관연구환궤호시공백.응용경전몽특잡락적방법재득도무자장하He2++H(1s)적팽당격발절면적기출상,상세연구료불동강도적종향화횡향강자장배경하도불동주양자수n화자양자수m적팽당격발과정적태선택절면.동시용비미우양자방법,득도료강자장하파원자적능급,병분석료기수자장강도변화적원인.대팽당과정발현유우자장적인입도치도불동m태적격발절면유교대적분리,동시재교저입사능구적태선택절면변화행위여자장방향유흔대관계,저여능급변화급횡향강자장소특유적항자항적상호경쟁유밀절련계.통과대유관사례、경적적분석,해석료저사변화형성적원인.야발현유우핵적운동,연자장방향적궤도각동량병비절대수항,이유미소적변화.
Based on the excitation cross-sections in collisions of H(1s) atoms with He2+ obtained by using the classical trajectory Monte Carlo method, the state-selective cross-sections of excitation processes for different n and m, where n and m are the principal and mag-netic quantum numbers respectively, are studied with the application of strong longitudinal and transverse magnetic fields. Meanwhile, the precise energy levels for atom H in strong magnetic fields are obtained by non-perturbative quantum method. It is found that there is some strong separation of the state-selective cross-sections among different magnetic quantum states. Such behaviors are related to the variation of the energy levels and the diamagnetic terms induced by the applied magnetic fields. The diamagnetic terms in transverse magnetic fields result in the rapid increase of the cross-sections for the state of negative m at 25keV/u, which is further indicated by the trajectory in this case. In some cases the decrease of the total excitation cross-sections is found to be due to the rise of the energy levels caused by the magnetic fields. The orbital angular momentum along the direction of the magnetic field is not conserved absolutely;this phenomenon is found also in the trajectories and agrees with our analysis.