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The muonic He atom and a preliminary study of the He-4 mu + H-2 reaction

机译:氦离子原子及He-4 mu + H-2反应的初步研究

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The muonic atom He-4 mu has the composition alpha(++)mu(-)e(-), and is formed by stopping negative muons in He doped with a small amount of NH3 (or Xe). It may be regarded as a unique heavy H-atom isotope with a mass of 4.1 amu. As such, the study of its chemical reaction rates and comparison with those of the well-known light Mu atom (0.113 amu) allows unprecedented tests of kinetic isotope effects over a range of 36 in mass. As a first example, and one which is of most fundamental interest, we have begun kinetics studies of the He mu + H-2 -> He mu H + H reaction in the gas phase. The first measurements, at 295 K, give a rate constant of k(He mu) = 4.1 +/- 0.7 X 10(-16) cm(3) molec(-1) s(-1). in comparison, variational transition state calculations give a value of 2.46 x 10(-6) cm(3) molec(-1) s-1, somewhat below the measurement, despite the large error bar, raising the possibility that the calculations, on an essentially exact potential energy surface, have underestimated the amount of quantum tunneling involved, even for this heavy H-atom isotope.
机译:离子原子He-4 mu的组成为alpha(++)mu(-)e(-),是通过停止掺有少量NH3(或Xe)的He中的负离子而形成的。它可以被认为是质量为4.1 amu的独特的重H原子同位素。因此,对其化学反应速率的研究以及与著名的轻质Mu原子(0.113 amu)的化学反应速率的比较,可以对质量范围为36的动力学同位素效应进行前所未有的测试。作为第一个例子,也是最基本的一个例子,我们已经开始对气相中He mu + H-2-> He mu H + H反应的动力学研究。在295 K时的第一次测量给出了k(He mu)= 4.1 +/- 0.7 X 10(-16)cm(3)molec(-1)s(-1)的速率常数。相比之下,尽管有较大的误差线,但变化过渡态计算得出的值为2.46 x 10(-6)cm(3)molec(-1)s-1,略低于测量值,这增加了计算的可能性即使对于这种重氢原子同位素,本质上精确的势能表面也低估了涉及的量子隧穿量。

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