Forskjell mellom versjoner av «Atomic Force Microscopy»
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| + | ==Fun facts== |
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| − | Et mikroskop med en liten tupp som bruker atomære krefter for å måle overflatestrukturer. |
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| + | High vacuum is not necessary. |
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| + | Piezoelectric position control system. |
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| + | The cantilever: V-shaped or single beam. V-shaped: high deflection sensitivity, not sensitive to torque. Single beam: vice-versa. |
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| + | Material used: diamond, tungsten, silicon. |
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| + | Artifacts: drift, non-linear hysterisis of piezoelectric. |
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| + | ==Modes of operation== |
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| − | Den har en del forskjellige modus, men de to mest generelle er vel konstant høyde og konstant spenning. |
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| + | It is the displacement of the probe tip at the end of the cantilever that is measured. |
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| + | =Contact mode= In the contact region of the potential energy curve, repulsive forces dominate. Two ways: Set height constant and measure repulsive force or set force constant and measure height. |
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| − | Man kan også få tuppen til å oscillere mens man scanner over prøven, eller bare slepe den bortover i kontakt med prøven, noen som kalles contact mode. |
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| + | =Tapping mode= In the semi-contact region of the potential energy curve. |
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| + | =Non-contact mode= In the non-contact region of the potential energy curve, attractive forces dominate and are measured. What is observed is a an increase in the amplitude of the oscillations of the vibrating probe, translated into a change in attractive forces. |
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Revisjonen fra 23. mai 2009 kl. 19:16
Fun facts
High vacuum is not necessary. Piezoelectric position control system. The cantilever: V-shaped or single beam. V-shaped: high deflection sensitivity, not sensitive to torque. Single beam: vice-versa.
Material used: diamond, tungsten, silicon.
Artifacts: drift, non-linear hysterisis of piezoelectric.
Modes of operation
It is the displacement of the probe tip at the end of the cantilever that is measured. =Contact mode= In the contact region of the potential energy curve, repulsive forces dominate. Two ways: Set height constant and measure repulsive force or set force constant and measure height. =Tapping mode= In the semi-contact region of the potential energy curve. =Non-contact mode= In the non-contact region of the potential energy curve, attractive forces dominate and are measured. What is observed is a an increase in the amplitude of the oscillations of the vibrating probe, translated into a change in attractive forces.
