enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Emission spectrum - Wikipedia

    en.wikipedia.org/wiki/Emission_spectrum

    The emission spectrum can be used to determine the composition of a material, since it is different for each element of the periodic table. One example is astronomical spectroscopy: identifying the composition of stars by analysing the received light. The emission spectrum characteristics of some elements are plainly visible to the naked eye ...

  3. Moseley's law - Wikipedia

    en.wikipedia.org/wiki/Moseley's_law

    Moseley's periodic law, concerning the modern periodic table. Auger electron spectroscopy , a similar phenomenon with increased X-ray yield from species of higher atomic number. Discovery of the neutron Mosley's law was an important step in the development of the understanding of the atom.

  4. Spectral line - Wikipedia

    en.wikipedia.org/wiki/Spectral_line

    This is the spectrum of a blue sky somewhat close to the horizon, looking east with the sun to the west at around 3–4 pm on a clear day. A spectral line is a weaker or stronger region in an otherwise uniform and continuous spectrum. It may result from emission or absorption of light in a narrow frequency range

  5. Spectral line shape - Wikipedia

    en.wikipedia.org/wiki/Spectral_line_shape

    Emission spectrum of a fluorescent light, exhibiting many spectral lines. Each line corresponds to an energy level in one of the elements inside the light. A spectral line can result from an electron transition in an atom, molecule or ion, which is associated with a specific amount of energy, E. When this energy is measured by means of some ...

  6. Sharp series - Wikipedia

    en.wikipedia.org/wiki/Sharp_series

    The sharp series limit is the same as the diffuse series limit. In the late 1800s these two were termed supplementary series. In 1896 Arthur Schuster stated his law: "If we subtract the frequency of the fundamental vibration from the convergence frequency of the principal series, we obtain the convergence frequency of the supplementary series". [5]

  7. Helium - Wikipedia

    en.wikipedia.org/wiki/Helium

    The first evidence of helium was observed on August 18, 1868, as a bright yellow line with a wavelength of 587.49 nanometers in the spectrum of the chromosphere of the Sun. The line was detected by French astronomer Jules Janssen during a total solar eclipse in Guntur, India. [27] [28] This line was initially assumed to be sodium.

  8. Holmium - Wikipedia

    en.wikipedia.org/wiki/Holmium

    Holmium (Holmia, Latin name for Stockholm) was discovered by the Swiss chemists Jacques-Louis Soret and Marc Delafontaine in 1878 who noticed the aberrant spectrographic emission spectrum of the then-unknown element (they called it "Element X").

  9. Spectroscopic notation - Wikipedia

    en.wikipedia.org/wiki/Spectroscopic_notation

    Spectroscopists customarily refer to the spectrum arising from a given ionization state of a given element by the element's symbol followed by a Roman numeral.The numeral I is used for spectral lines associated with the neutral element, II for those from the first ionization state, III for those from the second ionization state, and so on. [1]