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首页> 外文期刊>Physica, B. Condensed Matter >Toward the first study of chemical reaction dynamics of Mu with vibrational-state-selected reactants in the gas phase: The Mu + H-2*(v=1) reaction by stimulated Raman pumping
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Toward the first study of chemical reaction dynamics of Mu with vibrational-state-selected reactants in the gas phase: The Mu + H-2*(v=1) reaction by stimulated Raman pumping

机译：气相中振动态选择反应物对Mu的化学反应动力学的首次研究：受激拉曼泵浦的Mu + H-2 *（v = 1）反应

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摘要

Stimulated Raman pumping (SRP) is used to produce H-2 in its first vibrational state, in order to measure, for the first time, the Mu + H-2*(v = 1) -> MuH + H reaction rate at room temperature, as a prototypical example of new directions in gas-phase muonium chemistry, utilizing the pulsed muon beam and a new dedicated laser system at the RIKEN/RAL Laboratory. Reported here is a preliminary result but the final results are expected to provide definitive new tests of reaction rate theory on the highly accurate H-3 potential energy surface. The major difficulty in this experiment, compared to the standard SRP process, is to ensure a homogeneous excitation over a volume of several cm(3) and of sufficient intensity to ensure a measurable Mu relaxation rate. The techniques used to accomplish this are described. The experiment utilizes the 2nd harmonic output of a Nd:YAG laser (532 nm) with pulse energies up to 500 mJ at a repetition rate of 25 Hz. Different optical setups have been constructed and tested in order to optimize the number of laser-pumped H-2 molecules and their overlap with the stopping profile of the muon beam in the reaction cell (total volume similar to 100 x 40 x 4 mm(3)). The first result of this experiment gives a measured relaxation rate due to laser excitation of lambda* = 0.085 +/- 0.051 mu s(-1), consistent with theory but limited by both low statistics and particularly a high background relaxation rate.
机译：为了在室温下首次测量Mu + H-2 *（v = 1）-> MuH + H的反应速率，使用受激拉曼泵浦（SRP）来产生处于第一振动状态的H-2。 RIKEN / RAL实验室利用脉冲介子束和新型专用激光系统，将温度作为气相mu化学新方向的典型范例。这里报道的是初步结果，但最终结果有望为在高精度H-3势能面上提供反应速率理论的确定性新测试。与标准SRP工艺相比，该实验的主要困难是要确保在几cm（3）的体积上均匀激发并具有足够的强度以确保可测量的Mu弛豫率。描述了用于完成此操作的技术。该实验利用Nd：YAG激光器（532 nm）的二次谐波输出，其脉冲能量高达500 mJ，重复频率为25 Hz。为了优化激光泵送的H-2分子的数量及其与反应池中μ子束的终止轮廓的重叠（总体积类似于100 x 40 x 4 mm（3），已构建并测试了不同的光学装置））。该实验的第一个结果给出了由于lambda * = 0.085 +/- 0.051μs（-1）的激光激发而测得的弛豫率，与理论一致，但受统计量低，特别是背景弛豫率高的限制。

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