Experimental cell for molecular beam deposition and magnetic resonance studies of matrix isolated radicals at temperatures below 1 K.
Experimental cell for molecular beam deposition and magnetic resonance studies of matrix isolated radicals at temperatures below 1 K.
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用于在低于 1 K 的温度下对基质隔离自由基进行分子束沉积和磁共振研究的实验池。
DOI：
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发表时间：
2014
影响因子：
1.6
通讯作者：
David M. Lee
中科院分区：
文献类型：
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作者：
S. Sheludiakov;J. Ahokas;O. Vainio;J. Järvinen;D. Zvezdov;S. Vasiliev;V. Khmelenko;S. Mao;David M. Lee
我们提出了一个实验室的设计和性能构造的固体H2/D2膜，这是由分子束沉积在低于1 K的温度下创建的H和D原子的矩阵隔离研究。该样品池允许通过石英微量天平（QM）灵敏地称量薄膜，并在4.6T的强磁场中通过磁共振技术对其进行研究。我们能够在0.01至10分子层/秒的范围内调节沉积速率，并以10.2单层分辨率测量厚度。上QM电极用作连接到电子自旋共振（ESR）光谱仪的128 GHz法布里-珀罗谐振器的反射镜。在样品池中用射频放电原位产生H和D原子，并用ESR和电子-核双共振对其进行了表征。从磁共振测量，我们得出结论，薄膜是光滑的，并提供嵌入原子均匀的捕获条件。目前的样品池设计还可以校准ESR信号，并估计膜中H和D自由基的平均和局部浓度。
We present the design and performance of an experimental cell constructed for matrix isolation studies of H and D atoms in solid H2/D2 films, which are created by molecular beam deposition at temperatures below 1 K. The sample cell allows sensitive weighing of the films by a quartz microbalance (QM) and their studies by magnetic resonance techniques in a strong magnetic field of 4.6 T. We are able to regulate the deposition rate in the range from 0.01 to 10 molecular layers/s, and measure the thickness with ≈0.2 monolayer resolution. The upper QM electrode serves as a mirror for a 128 GHz Fabry-Perot resonator connected to an electron spin resonance (ESR) spectrometer. H and D atoms were created by RF discharge in situ in the sample cell, and characterized by ESR and electron-nuclear double resonance. From the magnetic resonance measurements we conclude that the films are smooth and provide homogeneous trapping conditions for embedded atoms. The current sample cell design also makes it possible to calibrate the ESR signal and estimate the average and local concentrations of H and D radicals in the film.