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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Alignment and Orientation Effects in Sr Energy Pooling
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Alignment and Orientation Effects in Sr Energy Pooling

机译：Sr能量池中的对准和取向效应

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Alignment and orientation effects in the energy pooling process, Sr(5s5p ~3P_1) + Sr(5s5p ~3P_1) -> Sr(5s5p ~1P_1) + Dr(is~2 ~BP_0), are studied in a single atomic beam. The Sr atoms are prepared in an aligned initial state with a polarized laser, and alignment information is extracted by observing the fluorescence from the final Sr(5s5p ~1P_1) state as the atoms precess in an applied magnetic field. This allows the dependence of the total energy pooling cross section (integrated over the final state alignment) on the initial state alignment to be almost completely described. A prominent alignment effect is observed. If m_j represents the component of total electronic angular momentum of a Sr(5s5p ~3P_1) atom along the relative velocity vector of the collision, then the total energy transfer cross section for a particular initial state alignment can be expressed as a sum of the so-called fundamental cross sections, #sigma#_(m_1m_2) and #sigma#_(m_1m_2;m_1'm_2'), that describe collisions between the various m_j states. Here #sigma#_(m_1m_2) represents the cross section for energy transfer when an atom in state m_1 collides with an atom in state m_2. The cross section #sigma#_(m_1m_2;m_1'm_2') represents the contribution to the total cross section from interference when the collinding system is in a superposition of the state m_1 colliding with m_2 and the state m_1' colliding with m_2'. It is found that the cross section #sigma#_(1-1), #sigma#_(00), and #sigma#_(10) as well as the interference terms Re(#sigma#_(00;1-1)) and #sigma#_(01;10) have relatively large values while #sigma#_(11) and #sigma#_(1-1;-11) are small. Couplled with future theoretical work, these results may provide new insights into the dynamics of the curve crossings that lead to energy transfer.
机译：在单个原子束中研究了能量池过程中的对准和取向效应Sr（5s5p〜3P_1）+ Sr（5s5p〜3P_1）-> Sr（5s5p〜1P_1）+ Dr（is〜2〜BP_0）。用偏振激光以对准的初始状态制备Sr原子，并通过观察来自最终Sr（5s5p〜1P_1）状态的荧光作为原子在所施加磁场中的进场来提取对准信息。这使得几乎完全描述了总能量池横截面（在最终状态取向上积分）对初始状态取向的依赖性。观察到明显的对准效果。如果m_j表示沿着碰撞的相对速度矢量的Sr（5s5p〜3P_1）原子的总电子角动量的分量，则特定初始状态对准的总能量传递截面可以表示为所谓的基本横截面#sigma #_（m_1m_2）和#sigma #_（m_1m_2; m_1'm_2'），描述了各种m_j状态之间的冲突。这里，＃sigma #_（m_1m_2）表示状态为m_1的原子与状态为m_2的原子碰撞时的能量传递截面。横截面#sigma #_（m_1m_2; m_1'm_2'）表示当碰撞系统处于状态m_1与m_2碰撞和状态m_1'与m_2'碰撞的叠加时，干扰对总横截面的贡献。发现截面#sigma #_（1-1），＃sigma #_（00）和#sigma #_（10）以及干扰项Re（#sigma #_（00; 1- 1））和#sigma #_（01; 10）的值较大，而#sigma #_（11）和#sigma #_（1-1; -11）的值较小。结合未来的理论工作，这些结果可能为导致能量传递的曲线交叉动力学提供新的见解。

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