Cryogenic variable temperature ultrahigh vacuum scanning tunneling microscope for single molecule studies on silicon surfaces
| Autor: | Nathan L. Yoder, Mark C. Hersam, Edward T. Foley, Nathan P. Guisinger |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Materials science
Silicon business.industry Liquid helium Scanning tunneling spectroscopy chemistry.chemical_element Spin polarized scanning tunneling microscopy Cryogenics Electrochemical scanning tunneling microscope law.invention Scanning probe microscopy Optics chemistry law Optoelectronics Scanning tunneling microscope business Instrumentation |
| Zdroj: | Review of Scientific Instruments. 75:5280-5287 |
| ISSN: | 1089-7623 0034-6748 |
| DOI: | 10.1063/1.1818871 |
| Popis: | The design and performance of a variable temperature ultrahigh vacuum (UHV) scanning tunneling microscope (STM) is presented. This STM operates from 8.2 to 300 K in a UHV environment with a base pressure of less than 6×10−11 Torr. Cooling is achieved from 300 to 80 K within 3.5 h and from 80 to 8.2 K within 4.5 h. The base temperature of 8.2 K is maintained at a liquid helium consumption rate of 0.9 l/h. This design allows for direct optical access to the tip-sample interface and direct line-of-sight dosing while the sample is mounted in the STM. The STM tip may be coarse translated laterally in two dimensions through a 6-mm-diam area at all temperatures. With the feedback loop off, the drift in the tip-sample spacing is approximately 0.008 A/min at 8.2 K. Atomic resolution feedback controlled lithography is performed on hydrogen passivated Si(100) and differential tunneling conductance maps are gathered for isolated cyclopentene molecules on unpassivated Si(100), thus demonstrating that this system is well suited for studying single molecules on silicon surfaces from 8.2 to 300 K. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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