Solar Spectrum wavelength in Å Joseph von Fraunhofer, 1814.

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Presentation transcript:

Solar Spectrum wavelength in Å Joseph von Fraunhofer, 1814

Radiation from hot objects

Emission Spectra Emission spectrum of Hydrogen

Emission Spectra Emission spectrum of Hydrogen Emission spectrum of Iron

Kirchhoff’s Three Laws of Spectroscopy: Light from a hot solid object has a continuous spectrum with no dark lines The same light, passed through a cool gas has the same spectrum, but with certain wavelengths missing  dark lines (absorption spectrum) Light emitted by a hot gas  bright lines superimposed on an otherwise black background  emission spectrum UV IR

Blackbody Radiation

Thompson’s Plum Pudding Model raisins pudding electrons are discrete particles embedded in a smeared out positive background charge

Rutherford’s Experiment

Rutherford’s Experiment

Rutherford’s Experiment Scattering Intensity (arb. units) Thompson model [°] Rutherford’s data

Rutherford’s Experiment

Atomic Spectra

Louis Victor Pierre Raymond, Matter Waves Louis Victor Pierre Raymond, 7e Duke of Broglie (1892 - 1987) Nobel Prize for Physics, 1922 < picture from www.wikipedia.org >

Electron Microscopy Carbon Nanotubes Ebola Reston CdSe Nanoparticles (Virginia) CdSe Nanoparticles