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Absorption Spectra of Chlorophyll

Science is facts; just as houses are made of stone, so is science made of facts; but a pile of stones is not a house, and a collection of facts is not necessarily science. Jules Henri Poincaré (1854-1912) French mathematician. Absorption Spectra of Chlorophyll. Electromagnetic Spectrum.

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Absorption Spectra of Chlorophyll

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  1. Science is facts; just as houses are made of stone, so is science made of facts; but a pile of stones is not a house, and a collection of facts is not necessarily science. • Jules Henri Poincaré (1854-1912) French mathematician. Absorption Spectra of Chlorophyll

  2. Electromagnetic Spectrum

  3. Measuring Light • Irradiance:measure of the amount of energy falling on a flat surface (amount per unity area) • Intensity: the amount of light leaving a light source • Photon: particle of light • Quanta: energy in a photon • PPFD: Photosynthetic Photon Flux Density (amount per unit area) • PAR: photosynthetically active radiation • (~350nm-700nm)

  4. Measuring light • Photometric • Based on our eye’s ability to detect electromagnetic radiation • Units are: foot-candles (fc) or lumens m-2 (lux)

  5. Measuring light • Radiometric • Based on actual spectral distribution • Units are: • Energy = W m-2 • Number of Photons = umole-m-2-s-1 Why do physiologists like photons?

  6. Photosynthesis: 1. Conversion of light energy to chemical energy. 2. Short term storage of chemical energy. 3. Long term storage of chemical energy.

  7. Basic principle of Photo-Chemistry One photon-------One Excitation

  8. Absorption Spectra of Chlorophyll

  9. Questions to answer using figure 1. • What is the effect of the atmosphere on direct sunlight? • Look at the “Direct Sunlight at Sea Level” line. What causes all the dips in the infra-red? • What colors (wavelengths) of light are selectively adsorbed by clouds? • What color is sky light? • Can you tell from this graph why leaves are green? • What is the significance of the lack of absorbance of infra-red radiation by vegetation?

  10. http://www.youtube.com/profile?user=greatpacificmedia#p/u/58/D6tbOBhbOZUhttp://www.youtube.com/profile?user=greatpacificmedia#p/u/58/D6tbOBhbOZU

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