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  2. Spectral line - Wikipedia

    en.wikipedia.org/wiki/Spectral_line

    The phrase "spectral lines", when not qualified, usually refers to lines having wavelengths in the visible band of the full electromagnetic spectrum. Many spectral lines occur at wavelengths outside this range. At shorter wavelengths, which correspond to higher energies, ultraviolet spectral lines include the Lyman series of hydrogen.

  3. Balmer series - Wikipedia

    en.wikipedia.org/wiki/Balmer_series

    Four lines (counting from the right) are formally in the visible range. Lines five and six can be seen with the naked eye, but are considered to be ultraviolet as they have wavelengths less than 400 nm. The Balmer series, or Balmer lines in atomic physics, is one of a set of six named series describing the spectral line emissions of the ...

  4. Redshift - Wikipedia

    en.wikipedia.org/wiki/Redshift

    If the same pattern of intervals is seen in an observed spectrum from a distant source but occurring at shifted wavelengths, it can be identified as hydrogen too. If the same spectral line is identified in both spectra—but at different wavelengths—then the redshift can be calculated using the table below.

  5. Hydrogen spectral series - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_spectral_series

    The spectral lines are grouped into series according to n′. Lines are named sequentially starting from the longest wavelength/lowest frequency of the series, using Greek letters within each series. For example, the 2 → 1 line is called "Lyman-alpha" (Ly-α), while the 7 → 3 line is called "Paschen-delta" (Pa-δ).

  6. Rydberg–Ritz combination principle - Wikipedia

    en.wikipedia.org/wiki/Rydberg–Ritz_combination...

    Lines of the spectra of elements could be predicted from existing lines. [ 1 ] [ 2 ] Since the frequency of light is proportional to the wavenumber or reciprocal wavelength , the principle can also be expressed in terms of wavenumbers which are the sum or difference of wavenumbers of two other lines.

  7. Lyman series - Wikipedia

    en.wikipedia.org/wiki/Lyman_series

    Therefore, the lines seen in the image above are the wavelengths corresponding to n = 2 on the right, to n → ∞ on the left. There are infinitely many spectral lines, but they become very dense as they approach n → ∞ (the Lyman limit), so only some of the first lines and the last one appear.

  8. Spectral line shape - Wikipedia

    en.wikipedia.org/wiki/Spectral_line_shape

    Spectral line shape or spectral line profile describes the form of an electromagnetic spectrum in the vicinity of a spectral line – a region of stronger or weaker intensity in the spectrum. Ideal line shapes include Lorentzian , Gaussian and Voigt functions, whose parameters are the line position, maximum height and half-width. [ 1 ]

  9. Lyman-alpha - Wikipedia

    en.wikipedia.org/wiki/Lyman-alpha

    Lyman-alpha, typically denoted by Ly-α, is a spectral line of hydrogen (or, more generally, of any one-electron atom) in the Lyman series.It is emitted when the atomic electron transitions from an n = 2 orbital to the ground state (n = 1), where n is the principal quantum number.