Radiant energy – Inspection of solids or liquids by charged particles
Patent
1995-11-07
1997-08-05
Berman, Jack I.
Radiant energy
Inspection of solids or liquids by charged particles
2504431, 25044211, 25044111, 73105, H01J 3726
Patent
active
056545460
ABSTRACT:
A compact Peltier Device is used to heat or cool a small sample stage of a scanning probe (AFM or STM) microscope. The entire heating/cooling system may fit onto a small platen which may be suspended below the scanning probe where it may be held in place against magnetic balls. Alternatively, the sample stage may be supported by a Peltier Device, itself supported by a scanner such as a Piezoelectric scanner with a scanning probe tip held fixedly above the sample stage. The side of the Peltier Device in contact with the platen is cooled (or heated) by a small flow of water through a heat exchanger. The reservoir of water is held at ambient temperature, minimizing the temperature gradient generated between the sample platen and the main body of the microscope. The small mass of the sample stage results in rapid heating or cooling so that an equilibrium is attained rapidly. Heat transfer through the scanning tip is negligible. Condensation and contamination of the sample is prevented by operating the entire sample chamber in an inert gas environment. The inert gas is also at ambient temperature. Water and other contaminants are first removed from the gas by passing it over cold baffles. It is then equilibrated back up to ambient temperature in a heat exchanger.
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Berman Jack I.
Molecular Imaging Corporation
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