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Sunbeds and stars...

Sunbeds and stars. Ionization, excitation and line spectra. Electron absorbs energy and…. Incident radiation. Hydrogen Atom. p. e. Ionisation!. e. Is able to completely escape from the atom . p. Energy = 0. Energy = -13.6eV. Ionisation!.

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Sunbeds and stars...

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  1. Sunbeds and stars... Ionization, excitation and line spectra

  2. Electron absorbs energy and… Incident radiation Hydrogen Atom p e

  3. Ionisation! e Is able to completely escape from the atom p

  4. Energy = 0 Energy = -13.6eV Ionisation! • Photons with a minimum energy of 13.6eV are needed to ionise a hydrogen atom from it’s ground state. p e

  5. Electron absorbs radiation and… Lower frequency radiation Hydrogen Atom p e

  6. Excitation! e p Is only able to move to a higher energy state within the atom

  7. -13.6eV -3.6eV e 10eV The electron in its excited state is unstable and so it drops back, releasing the energy as a photon. p One photon with a specific amount of energy is released in an electron transition

  8. - + High Voltage e e Argon e e Mercury Ionisation and excitation in a fluorescent tube • High voltage - electrons bombard mercury atoms • Excitation occurs - unstable electrons fall back • Ionisationallows the current to flow

  9. High voltage - + e e Argon e e Phosphorous coating e e Fluorescence

  10. Spectral transitions in hydrogen Ionisation 0eV Electron transitions Ground state -13.6eV

  11. Spectroscopy Looking at the signatures of elements Intensity Wavelength of radiation emitted or absorbed

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