The Electronic and Magnetic Properties of Small Metal-Benzene Complexes Trapped in Helium Droplets

研究分子络合物的物理性质的一个主要困难是它们的温度。络合物要么热不稳定，要么有足够的运动，因此很难通过测量它们的光谱来确定结构。物理学中的一个最新发展是使用氦液滴来捕获和冷却络合物。在绝对零度以上仅0.38K的温度下，液滴能够捕获不稳定的物种并降低它们的温度，这使得它们的光谱分析相对简单。在这项研究中，我们建议使用这种方法来研究过渡金属与苯之间的络合物，这些络合物被视为金属表面金属/pi电子相互作用的模型。将络合物冷却到0.38K将有可能识别发生的电子跃迁的性质，并利用这些跃迁来确定络合物的磁矩。激光蒸发和冷氦液滴的结合将使研究一系列原本不稳定的金属/苯络合物成为可能。

A major difficulty in studying the physical properties of molecular complexes is their temperature. Complexes are either thermally unstable or have sufficient motion as to make it very hard to assign structure from measurements of their spectra. A very recent development in physical sciences is the use of helium droplets to trap and cool complexes. With a temperature of just 0.38 K above absolute zero, droplets are capable of trapping unstable species and reducing their temperature, which makes analysis of their spectra comparatively simple. In this study we propose to use this approach to investigate complexes between transition metals and benzene, which are seen as models for metal / pi electron interactions at metallic surfaces. Cooling the complexes to 0.38 K will make it possible to identify the nature of the electronic transitions taking place and to use these transitions to establish the magnetic moment of the complex. A combination of laser vaporization and the cold helium droplets will make it possible to study a wide range of otherwise unstable metal/benzene complexes.