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  2. Precision tests of QED - Wikipedia

    en.wikipedia.org/wiki/Precision_tests_of_QED

    This is an indirect method of measuring α, based on measurements of the masses of the electron, certain atoms, and the Rydberg constant. The Rydberg constant is known to seven parts in a trillion. The mass of the electron relative to that of caesium and rubidium atoms is also known with extremely high precision. If the mass of the electron can ...

  3. Rydberg constant - Wikipedia

    en.wikipedia.org/wiki/Rydberg_constant

    The hydrogen spectral series can be expressed simply in terms of the Rydberg constant for hydrogen and the Rydberg formula. In atomic physics , Rydberg unit of energy , symbol Ry, corresponds to the energy of the photon whose wavenumber is the Rydberg constant, i.e. the ionization energy of the hydrogen atom in a simplified Bohr model.

  4. Rydberg ionization spectroscopy - Wikipedia

    en.wikipedia.org/wiki/Rydberg_ionization...

    The same approach that produces an ionization event can be used to access the dense manifold of near-threshold Rydberg states with laser experiments. These experiments often involve a laser operating at one wavelength to access the intermediate Rydberg state and a second wavelength laser to access the near-threshold Rydberg state region.

  5. Variational method (quantum mechanics) - Wikipedia

    en.wikipedia.org/wiki/Variational_method...

    The ground state energy would then be 8E 1 = −109 eV, where E 1 is the Rydberg constant, and its ground state wavefunction would be the product of two wavefunctions for the ground state of hydrogen-like atoms: [2]: 262 (,) = (+) /. where a 0 is the Bohr radius and Z = 2, helium's nuclear charge.

  6. Isotopic shift - Wikipedia

    en.wikipedia.org/wiki/Isotopic_shift

    In a theoretical model of atom, which has a infinitely massive nucleus, the energy (in wavenumbers) of a transition can be calculated from Rydberg formula: ~ = (′), where and ′ are principal quantum numbers, and is Rydberg constant.

  7. Rydberg–Klein–Rees method - Wikipedia

    en.wikipedia.org/wiki/Rydberg–Klein–Rees_method

    The Rydberg–Klein–Rees method is a procedure used in the analysis of rotational-vibrational spectra of diatomic molecules to obtain a potential energy curve from the experimentally-known line positions.

  8. Wheeler's delayed-choice experiment - Wikipedia

    en.wikipedia.org/wiki/Wheeler's_delayed-choice...

    The first real experiment to follow Wheeler's intention for a double-slit apparatus to be subjected to end-game determination of detection method is the one by Walborn et al. [19] Researchers with access to radio telescopes originally designed for SETI research have explicated the practical difficulties of conducting the interstellar Wheeler ...

  9. Index of physics articles (R) - Wikipedia

    en.wikipedia.org/wiki/Index_of_physics_articles_(R)

    Rydberg atom; Rydberg constant; Rydberg formula; Rydberg matter; Rydberg molecule; Rydberg state; Rydberg–Klein–Rees method; Rydberg–Ritz combination principle; Ryogo Kubo; Rytov number; Rényi entropy; Rømer's determination of the speed of light