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  2. Hückel method - Wikipedia

    en.wikipedia.org/wiki/Hückel_method

    The method predicts how many energy levels exist for a given molecule, which levels are degenerate and it expresses the molecular orbital energies in terms of two parameters, called α, the energy of an electron in a 2p orbital, and β, the interaction energy between two 2p orbitals (the extent to which an electron is stabilized by allowing it ...

  3. Resonance fluorescence - Wikipedia

    en.wikipedia.org/wiki/Resonance_fluorescence

    There are several limits that can be analyzed to make the study of resonance fluorescence easier. The first of these is the approximations associated with the Weak Field Limit, where the square modulus of the Rabi frequency of the field that is coupled to two-level atom is much smaller than the rate of spontaneous emission of the atom.

  4. Perrin number - Wikipedia

    en.wikipedia.org/wiki/Perrin_number

    The main double-and-add loop, originally devised to run on an HP-41C pocket calculator, computes P(n) mod n and the reverse P(−n) mod n at the cost of six modular squarings for each bit of n. The subscripts of the Perrin numbers are doubled using the identity P(2t) = P 2 (t) − 2P(−t) .

  5. Poisson's equation - Wikipedia

    en.wikipedia.org/wiki/Poisson's_equation

    Siméon Denis Poisson. Poisson's equation is an elliptic partial differential equation of broad utility in theoretical physics.For example, the solution to Poisson's equation is the potential field caused by a given electric charge or mass density distribution; with the potential field known, one can then calculate the corresponding electrostatic or gravitational (force) field.

  6. Black-body radiation - Wikipedia

    en.wikipedia.org/wiki/Black-body_radiation

    Blacksmiths judge workpiece temperatures by the colour of the glow. [7] This blacksmith's colourchart stops at the melting temperature of steel. Black-body radiation has a characteristic, continuous frequency spectrum that depends only on the body's temperature, [8] called the Planck spectrum or Planck's law.

  7. Riemann zeta function - Wikipedia

    en.wikipedia.org/wiki/Riemann_zeta_function

    The Riemann zeta function ζ(z) plotted with domain coloring. [1] The pole at = and two zeros on the critical line.. The Riemann zeta function or Euler–Riemann zeta function, denoted by the Greek letter ζ (), is a mathematical function of a complex variable defined as () = = = + + + for ⁡ >, and its analytic continuation elsewhere.

  8. Glossary of engineering: M–Z - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_engineering:_M–Z

    Statistics deals with every aspect of data, including the planning of data collection in terms of the design of surveys and experiments. [189] Steam table Thermodynamic data table containing steam or water properties . [190] Stefan–Boltzmann law The Stefan–Boltzmann law describes the power radiated from a black body in terms of its temperature.