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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Spin depolarization of N_2~+(~2Σ~+)in collisions with ~3He in a magnetic field: general behaviour and zero energy Feshbach resonances
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Spin depolarization of N_2~+(~2Σ~+)in collisions with ~3He in a magnetic field: general behaviour and zero energy Feshbach resonances

机译：在磁场中与〜3He碰撞时N_2〜+（〜2Σ〜+）的自旋去极化：一般行为和零能Feshbach共振

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摘要

We give a brief account of the effect of a magnetic field on the spin-depolarization crosssections of N2+(2Σ)in collisions with3He at very low collision energy. The fundamental statesof the two nuclear spin isomers of n2+ are shown to respond quite differently to the applicationof the field. When the applied magnetic field increases, the spin depolarization cross sectionsare found to monotonously decrease for the fundamental para level N = 0 of N2+, whereas theymonotonously increase for the fundamental ortho level N = 1 of N2+.This effect is found to beamplified around the resonances and an explanation based on the different mechanism of spinflipping acting for these two levels is proposed. We also explore the tuning of zero energyFeshbach resonances by examining the variation of the scattering length as a function of themagnetic field. We use the Smith Q matrix to calculate the lifetimes of the complexesassociated with these resonances and discuss the law of variation as a function of the magneticfield of the Q matrix eigenvalues across such resonances.
机译：我们简要介绍了磁场在非常低的碰撞能量下与3 He碰撞时对N2 +（2Σ）的自旋去极化截面的影响。已显示n2 +的两个核自旋异构体的基本状态对本领域的应用有很大不同。当施加的磁场增加时，自旋去极化截面在N2 +的基本对位能级N = 0时单调减小，而在N2 +的基本正交能级N = 1时单调增大。并针对这两个层次提出了基于自旋翻转的不同机制的解释。通过检查散射长度随磁场的变化，我们还探索了零能费什巴赫共振的调谐。我们使用史密斯Q矩阵来计算与这些共振相关的复合物的寿命，并讨论在这些共振中随Q矩阵特征值的磁场变化的规律。

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