论文标题
通过探测冷碰撞中的弹性和反应性散射来确定量子共振的性质
Determining the nature of quantum resonances by probing elastic and reactive scattering in cold collisions
论文作者
论文摘要
散射共振在物理和化学碰撞过程中起着核心作用。由于散射波形的空间定位，它们有助于建立对碰撞动态的直观理解。对于位于离心屏障后面短间隔的反应区域中的共振，反应速率的尖峰是特征签名，最近在低能碰撞中使用了最新的实验观察到。但是，如果定位发生在反应区域之外，则主要是修改弹性散射。这可能是由于上述屏障共振，即经典轨道的量子类似物。通过探测合并束实验中亚稳态氦与氘分子的弹性和非弹性散射，我们可以区分量子共振的性质 - 隧穿的性质与屏障高于屏障的性质 - 并通过计算相应的散射波形函数来证实我们的发现。
Scattering resonances play a central role in collision processes in physics and chemistry. They help building an intuitive understanding of the collision dynamics due to the spatial localization of the scattering wavefunctions. For resonances that are localized in the reaction region, located at short separation behind the centrifugal barrier, sharp peaks in the reaction rates are the characteristic signature, observed recently with state-of-the-art experiments in low energy collisions. If, however, the localization occurs outside of the reaction region, mostly the elastic scattering is modified. This may occur due to above barrier resonances, the quantum analogue of classical orbiting. By probing both elastic and inelastic scattering of metastable helium with deuterium molecules in merged beam experiments, we differentiate between the nature of quantum resonances -- tunneling vs above barrier -- and corroborate our findings by calculating the corresponding scattering wavefunctions.
