12 Questions
What is the primary purpose of a conductive coating on a polymer surface in SEM?
To make the surface conductive for the electron beam
What is the maximum magnification possible using TEM?
One million
What is the primary difference between SEM and TEM?
SEM uses a transmitted beam, while TEM uses a reflected beam
What is the main application of STM in SPM?
Topographic profiling of electrically conductive materials
What is the primary advantage of AFM over STM in SPM?
AFM can be used under room conditions
What is the primary reason for using extremely low pressures in STM experiments?
To facilitate the tunneling current
What is the main feature that enables near-field scanning optical microscopy (NSOM) to achieve high resolution?
The direction of light through the probe tip onto the sample
What is the primary advantage of NSOM over traditional optical microscopy?
The reduction of out-of-focus light
How does electron microscopy achieve high resolution?
By accelerating electrons to high speeds, reducing their wavelength
What is the upper limit of magnification for traditional optical microscopes?
2000 times
What is the result of the light emanating from the probe tip in NSOM?
The spread of light over the surface
What is the purpose of NSOM in the context of polymer surface imaging?
To observe atomic structures
Learn about the principles of Near-field Scanning Optical Microscopy (NSOM), its capabilities, and its similarities with Atomic Force Microscopy (AFM). Discover how NSOM allows for high-resolution optical microscopy, extending its capabilities to near that of electron microscopy.
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