We study the excitation redistribution from cesium 7P_1/2 or 7P_3/2 to neighboring energy levels by black body radiation (BBR) and inter atomic collisions using pump-probe spectroscopy inside a vapor cell. At low vapor densities we measure redistribution of the initial, velocity-selected, atomic excitation by BBR. This redistribution preserves the selected atomic velocities allowing us to perform high resolution spectroscopy of the 6D → 7F transitions. This transfer mechanism could also be used to perform sub-Doppler spectroscopy of the cesium highly-excited nG levels. At high densities we observe interatomic collisions redistributing the excitation within the cesium 7P fine and hyperfine structure. We show that 7P redistribution involves state-changing collisions that preserve the initial selection of atomic velocities. These redistribution mechanisms can be of importance for experiments probing high lying excited states in dense alkali vapor.

我们研究了铯7P _1/2或7P _3/2的激发重分布通过黑体辐射（BBR）和原子间碰撞（使用蒸气室内部的泵浦探针光谱法）达到相邻的能级。在低蒸汽密度下，我们测量了由BBR进行的，初速选择的原子激发的重新分布。这种重新分布保留了选定的原子速度，使我们能够执行6D→7F跃迁的高分辨率光谱。这种转移机制还可以用于对铯高度激发的nG水平进行亚多普勒光谱分析。在高密度下，我们观察到原子间碰撞使铯7P精细和超精细结构中的激发重新分布。我们表明7P重新分布涉及状态更改碰撞，该碰撞保留了原子速度的初始选择。