Centre for molecular and materials science at TRIUMF

这项建议要求继续支持TRIUMF分子和材料科学中心(CMMS)。CMMS提供设备和支持人员，使外部研究人员能够利用介子和放射性核素的TRIUMF束流来研究化学、物理和材料科学中的问题。它是美洲唯一的此类设施，也是世界上仅有的两个可比设施之一。自1988年以来，由NSERC资助，它为化学、物理和材料科学方面的广泛用户提供服务。固态物理学家使用介子来探测具有重要技术意义的材料的微观性质，例如超导体和新型磁体。化学家们感兴趣的是，作为Muonium(Mu)的核心的Muon，它是氢的一种轻同位素，也是自由基的自旋标签。MU研究还提供了一种研究氢在固体中的行为的方法，例如作为一种微量杂质，极大地改变了半导体的电子和光学性质。ISAC最近开发的β-核磁共振设备以类似于介子的方式使用短寿命的放射性离子来探测固体的局部性质。这些探头是在低能量下植入的，因此可以停留在几十纳米厚度的材料中。据报道，TRIUMF 2005-2010五年计划包括275万美元的资本相关人员成本，用于建设一条新的光束线，供坐标测量机使用。需要更多的支助人员来管理增加的基础设施，并支持与加拿大大学最近的教师任命相关的新用户群体(过去五年中有10个)。CMMS的目标也是向更广泛的用户群提供服务，这些用户需要使用该设施，但不应指望他们成为Muon和放射性束流技术方面的专家。由于个别研究小组每年通常花费1-6周的时间进行光束处理，因此必要的光谱仪必须由一群长期工作人员共同持有和管理。这就是TRIUMF分子和材料科学中心的作用。

This proposal requests continued support for the Centre for Molecular and Materials Science at TRIUMF (CMMS). CMMS provides equipment and support personnel to enable external researchers to make use of the TRIUMF beams of muons and radioactive nuclides to investigate problems in chemistry, physics and materials science. It is the only facility of its kind in the Americas, and one of only two comparable facilities in the world. Funded by NSERC since 1988, it serves users with a wide range of interests in chemistry, physics and materials science. Solid-state physicists use muons to probe the microscopic properties of technologically important materials, such as superconductors and novel magnets. Chemists are interested in the muon as the nucleus of muonium (Mu), a light isotope of hydrogen and a spin label for free radicals. Mu studies also provide a means for investigating the behaviour of hydrogen in solids, e.g. as a trace impurity that dramatically modifies the electronic and optical properties of semiconductors. The recently developed beta-NMR facility at ISAC uses short-lived radioactive ions in a manner similar to muons to probe local properties of solids. These probes are implanted at low energies, and hence can stop in materials with tens of nanometer thickness.       The TRIUMF Five Year Plan 2005-2010 includes $2.75 million in capital + associated personnel costs for the construction of a new beam line for CMMS use. Additional support staff are needed to manage the increased infrastructure and to support the new user groups associated with recent faculty appointments at Canadian universities (10 in the past five years). It is also the aim of CMMS to provide services to a broader base of users, who need to use the facility but who should not be expected to become experts in muon and radioactive beam techniques. Since individual research groups typically take beam time for 1-6 weeks per year, it is essential for necessary spectrometers to be held in common and managed by a core of permanent staff.  That is the role of the Centre for Molecular and Materials Science at TRIUMF.