L03-Thermo_and_ Kinetics

L03-Thermo_and_ Kinetics - Thermodynamics and Kinetics A...

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Thermodynamics and Kinetics
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A Little Justification … Thin film growth is intimately intertwined with thermodynamics and gas kinetics. Temperature and pressure are the main parameters of film growth, especially in vacuum systems. As most films form through the contact of a vapor with a substrate, gas and molecular kinetics have to be taken into account as well. The chemical reactions involved in film formation have to satisfy the rules of thermodynamics.
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Thermal Equilibrium Two objects are in thermal equilibrium when there is no exchange of energy when they are in contact. Objects in thermal equilibrium are said to have the same temperature. An ideal gas obeys the relation: nRT PV where P is pressure, V is volume, T is temperature, n is the number of moles and R is the universal gas constant (8.314 J/(mol.K))
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Entropy Entropy ( S ) is the physical measure of disorder in a system. In a reversible process, the change in entropy ' S of a system from an initial state, i to a final state, f is: This means that the entropy of a closed system remains constant. ³ ' f i r T dQ S where Q r is the energy transferred by the reversible process and T is the temperature.
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Laws of Thermodynamics Zeroth Law : If two objects are separately in equilibrium with a third object, then they are in equilibrium with each other.
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L03-Thermo_and_ Kinetics - Thermodynamics and Kinetics A...

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