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  2. Partition function (statistical mechanics) - Wikipedia

    en.wikipedia.org/wiki/Partition_function...

    The grand canonical partition function applies to a grand canonical ensemble, in which the system can exchange both heat and particles with the environment, at fixed temperature, volume, and chemical potential. Other types of partition functions can be defined for different circumstances; see partition function (mathematics) for

  3. Partition function (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Partition_function...

    The partition function or configuration integral, as used in probability theory, information theory and dynamical systems, is a generalization of the definition of a partition function in statistical mechanics. It is a special case of a normalizing constant in probability theory, for the Boltzmann distribution.

  4. Rotational partition function - Wikipedia

    en.wikipedia.org/wiki/Rotational_partition_function

    Rotational energies are quantized. For a diatomic molecule like CO or HCl, or a linear polyatomic molecule like OCS in its ground vibrational state, the allowed rotational energies in the rigid rotor approximation are = = (+) = (+). J is the quantum number for total rotational angular momentum and takes all integer values starting at zero, i.e., =,,, …, = is the rotational constant, and is ...

  5. Transfer-matrix method (statistical mechanics) - Wikipedia

    en.wikipedia.org/wiki/Transfer-matrix_method...

    In either case, the partition function may be solved exactly using eigenanalysis. If the matrices are all the same matrix W , the partition function may be approximated as the N th power of the largest eigenvalue of W , since the trace is the sum of the eigenvalues and the eigenvalues of the product of two diagonal matrices equals the product ...

  6. Partition function - Wikipedia

    en.wikipedia.org/wiki/Partition_function

    Partition function may refer to: Partition function (statistical mechanics) , a function used to derive thermodynamic properties Rotational partition function , partition function for the rotational modes of a molecule

  7. Translational partition function - Wikipedia

    en.wikipedia.org/wiki/Translational_partition...

    In statistical mechanics, the translational partition function, is that part of the partition function resulting from the movement (translation) of the center of mass. For a single atom or molecule in a low pressure gas, neglecting the interactions of molecules , the canonical ensemble q T {\displaystyle q_{T}} can be approximated by: [ 1 ]

  8. Partition function (quantum field theory) - Wikipedia

    en.wikipedia.org/wiki/Partition_function...

    In quantum field theory, partition functions are generating functionals for correlation functions, making them key objects of study in the path integral formalism. They are the imaginary time versions of statistical mechanics partition functions , giving rise to a close connection between these two areas of physics.

  9. Vibrational partition function - Wikipedia

    en.wikipedia.org/wiki/Vibrational_partition_function

    The vibrational partition function [1] traditionally refers to the component of the canonical partition function resulting from the vibrational degrees of freedom of a system. The vibrational partition function is only well-defined in model systems where the vibrational motion is relatively uncoupled with the system's other degrees of freedom.

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