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首页> 外文期刊>The Journal of Chemical Physics >Imaging characterization of the rapid adiabatic passage in a source-rotatable, crossed-beam scattering experiment
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Imaging characterization of the rapid adiabatic passage in a source-rotatable, crossed-beam scattering experiment

机译：源可旋转，横梁散射实验中快速绝热通道的成像特征

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摘要

In order to achieve a more efficient preparation of a specific ro-vibrationally excited reactant state for reactive scattering experiments, we implemented the rapid adiabatic passage (RAP) scheme to our pulsed crossed-beam machine, using a single-mode, continuous-wave mid-infrared laser. The challenge for this source-rotatable apparatus lies in the non-orthogonal geometry between the molecular beam and the laser propagation directions. As such, the velocity spread of the supersonic beam results in a significantly broader Doppler distribution that needs to be activated for RAP to occur than the conventional orthogonal configuration. In this report, we detail our approach to shifting, locking, and stabilizing the absolute mid-infrared frequency. We exploited the imaging detection technique to characterize the RAP process and to quantify the excitation efficiency. We showed that with appropriate focusing of the IR laser, a nearly complete population transfer can still be achieved in favorable cases. Compared to our previous setup-a pulsed optical parametric oscillator/amplifier in combination with a multipass ring reflector for saturated absorption, the present RAP scheme with a single-pass, continuous-wave laser yields noticeably higher population-transfer efficiency. Published by AIP Publishing.
机译：为了实现更有效的准备对反应散射实验的特定RO振动激发的反应性状态，我们使用单模连续波中的脉冲交叉梁机实施了快速的绝热通道（RAP）方案-Infrared激光。该源可旋转装置的挑战在于分子梁和激光传播方向之间的非正交几何形状。这样，超音梁的速度扩展导致需要激活更广泛的多普勒分布，该分布需要被激活，以便比传统的正交配置发生。在本报告中，我们详细介绍了换档，锁定和稳定绝对中红外频率的方法。我们利用了成像检测技术来表征RAP过程并量化激发效率。我们表明，通过适当的重点IR激光，仍然可以在有利的情况下实现几乎完全的人口转移。与我们先前的设置脉冲光学参数振荡器/放大器相结合，与多处环形反射器相结合，用于饱和吸收，目前具有单通的RAP方案，连续波激光产生显着较高的人口转移效率。通过AIP发布发布。

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