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  2. Energy level - Wikipedia

    en.wikipedia.org/wiki/Energy_level

    In a very general way, energy level differences between electronic states are larger, differences between vibrational levels are intermediate, and differences between rotational levels are smaller, although there can be overlap. Translational energy levels are practically continuous and can be calculated as kinetic energy using classical mechanics.

  3. Subatomic particle - Wikipedia

    en.wikipedia.org/wiki/Subatomic_particle

    The negatively charged electron has a mass of about ⁠ 1 / 1836 ⁠ of that of a hydrogen atom. The remainder of the hydrogen atom's mass comes from the positively charged proton. The atomic number of an element is the number of protons in its nucleus. Neutrons are neutral particles having a mass slightly greater than that of the proton.

  4. Jaynes–Cummings model - Wikipedia

    en.wikipedia.org/wiki/Jaynes–Cummings_model

    To realize the dynamics predicted by the Jaynes–Cummings model experimentally requires a quantum mechanical resonator with a very high quality factor so that the transitions between the states in the two-level system (typically two energy sub-levels in an atom) are coupled very strongly by the interaction of the atom with the field mode. This ...

  5. Atomic orbital - Wikipedia

    en.wikipedia.org/wiki/Atomic_orbital

    If the electron receives energy that is less than or greater than this value, it cannot jump from state 1 to state 2. Now, suppose we irradiate the atom with a broad-spectrum of light. Photons that reach the atom that have an energy of exactly E 2 − E 1 will be absorbed by the electron in state 1, and that electron will jump to state 2 ...

  6. Electron configuration - Wikipedia

    en.wikipedia.org/wiki/Electron_configuration

    The energy associated to an electron is that of its orbital. The energy of a configuration is often approximated as the sum of the energy of each electron, neglecting the electron-electron interactions. The configuration that corresponds to the lowest electronic energy is called the ground state. Any other configuration is an excited state.

  7. Degenerate energy levels - Wikipedia

    en.wikipedia.org/wiki/Degenerate_energy_levels

    The energy levels in the hydrogen atom depend only on the principal quantum number n. For a given n , all the states corresponding to ℓ = 0 , … , n − 1 {\displaystyle \ell =0,\ldots ,n-1} have the same energy and are degenerate.

  8. Kasha's rule - Wikipedia

    en.wikipedia.org/wiki/Kasha's_rule

    A photon with energy excites an electron of fundamental level, of energy , up to an excited energy level (e.g. or ) or on one of the vibrational sub-levels. Vibrational relaxation then takes place between excited levels, which leads to dissipation of part of the energy ( Δ E d {\displaystyle \Delta E_{d}} ), taking the form of a transition ...

  9. File:Atomic orbital energy levels.svg - Wikipedia

    en.wikipedia.org/wiki/File:Atomic_orbital_energy...

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