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  2. Hund's rule of maximum multiplicity - Wikipedia

    en.wikipedia.org/wiki/Hund's_Rule_of_Maximum...

    A high multiplicity state is therefore the same as a high-spin state. The lowest-energy state with maximum multiplicity usually has unpaired electrons all with parallel spin. Since the spin of each electron is 1/2, the total spin is one-half the number of unpaired electrons, and the multiplicity is the number of unpaired electrons + 1.

  3. Multiplicity (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Multiplicity_(chemistry)

    Each has two electrons of opposite spin in the π* level so that S = 0 and the multiplicity is 2S + 1 = 1 in consequence. In the first excited state, the two π* electrons are paired in the same orbital, so that there are no unpaired electrons. In the second excited state, however, the two π* electrons occupy different orbitals with opposite spin.

  4. Orbital motion (quantum) - Wikipedia

    en.wikipedia.org/wiki/Orbital_motion_(quantum)

    Quantum orbital motion involves the quantum mechanical motion of rigid particles (such as electrons) about some other mass, or about themselves.In classical mechanics, an object's orbital motion is characterized by its orbital angular momentum (the angular momentum about the axis of rotation) and spin angular momentum, which is the object's angular momentum about its own center of mass.

  5. Electron multiplier - Wikipedia

    en.wikipedia.org/wiki/Electron_multiplier

    Contrasting differences between discrete and continuous electron multipliers. An electron multiplier is a vacuum-tube structure that multiplies incident charges. [1] In a process called secondary emission, a single electron can, when bombarded on secondary-emissive material, induce emission of roughly 1 to 3 electrons.

  6. Electron configuration - Wikipedia

    en.wikipedia.org/wiki/Electron_configuration

    The term 1π g 2 represents the two electrons in the two degenerate π*-orbitals (antibonding). From Hund's rules, these electrons have parallel spins in the ground state, and so dioxygen has a net magnetic moment (it is paramagnetic). The explanation of the paramagnetism of dioxygen was a major success for molecular orbital theory.

  7. Pauli exclusion principle - Wikipedia

    en.wikipedia.org/wiki/Pauli_exclusion_principle

    For example, if two electrons reside in the same orbital, then their values of n, ℓ, and m ℓ are equal. In that case, the two values of m s (spin) pair must be different. Since the only two possible values for the spin projection m s are +1/2 and −1/2, it follows that one electron must have m s = +1/2 and one m s = −1/2.

  8. How to Introduce Dogs: The Best Trainer-Approved Method - AOL

    www.aol.com/lifestyle/introduce-dogs-best...

    8. Off-Leash Contact. If the on-leash contact went well, on another day, it may be possible to introduce the dogs off-leash in a neutral and safely fenced area after the next parallel walk.

  9. Dirac equation - Wikipedia

    en.wikipedia.org/wiki/Dirac_equation

    The Dirac equation in the form originally proposed by Dirac is: [7]: 291 [8] (+ =) (,) = (,) where ψ(x, t) is the wave function for an electron of rest mass m with spacetime coordinates x, t. p 1, p 2, p 3 are the components of the momentum, understood to be the momentum operator in the Schrödinger equation.