Mao S, Meraki A, McColgan P T, Shemelin V, Khmelenko V V, Lee D M
Institute for Quantum Science and Engineering and Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA.
Cornell Laboratory for Accelerator-based Science and Education, Cornell University, Ithaca, New York 14853, USA.
Rev Sci Instrum. 2014 Jul;85(7):073906. doi: 10.1063/1.4891189.
We present the design and performance of an experimental setup for simultaneous electron spin resonance (ESR) and optical studies of nanoclusters with stabilized free radicals at cryogenic temperatures. A gas mixture of impurities and helium after passing through a RF discharge for dissociation of molecules is directed onto the surface of superfluid helium to form the nanoclusters of impurities. A specially designed ESR cavity operated in the TE011 mode allows optical access to the sample. The cavity is incorporated into a homemade insert which is placed inside a variable temperature insert of a Janis (4)He cryostat. The temperature range for sample investigation is 1.25-300 K. A Bruker EPR 300E and Andor 500i optical spectrograph incorporated with a Newton EMCCD camera are used for ESR and optical registration, respectively. The current experimental system makes it possible to study the ESR and optical spectra of impurity-helium condensates simultaneously. The setup allows a broad range of research at low temperatures including optically detected magnetic resonance, studies of chemical processes of the active species produced by photolysis in solid matrices, and investigations of nanoclusters produced by laser ablation in superfluid helium.
我们展示了一种用于在低温下对具有稳定自由基的纳米团簇进行同步电子自旋共振（ESR）和光学研究的实验装置的设计与性能。杂质与氦气的混合气体在通过用于分子解离的射频放电后，被引导至超流氦表面以形成杂质纳米团簇。一个以TE011模式运行的特殊设计的ESR腔允许对样品进行光学访问。该腔被整合到一个自制的插入件中，该插入件放置在Janis（4）He低温恒温器的可变温度插入件内。样品研究的温度范围是1.25 - 300K。分别使用配备牛顿EMCCD相机的布鲁克EPR 300E和安道尔500i光学光谱仪进行ESR和光学记录。当前的实验系统使得能够同时研究杂质 - 氦凝聚物的ESR和光学光谱。该装置允许在低温下进行广泛的研究，包括光探测磁共振、固体基质中光解产生的活性物种的化学过程研究以及超流氦中激光烧蚀产生的纳米团簇的研究。
