Biology 1002B Lecture Notes - Lecture 2: Electron Excitation, Photon, Photosynthetic Reaction Centre
3 Feb 2013
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Lecture 2: light: relationship between excited states of a pigment and its absorption, fluorescence emission spectra. White light is a mixture of wavelengths. Chlorophyll can absorb blue light to higher excited state. Heat loss 10^-12 s: from higher excited state to the lower excited state, decay is so fast that the energy is always at lower. If absorb red light = low excited state excited state regardless if absorb blue or red: region of the electromagnetic spectrum known as visible light . 400 nm to 700 nm: relationship between wavelength and energy content of a photon. The shorter the wavelength the more energy it has. Photons/quanta: discrete package of light with defined energy content. Inversely proportional: molecular characteristic of visible pigments that make them able to absorb light. Pigments absorb photons of light: conjugated system double bond, single bond, double bond, single bond, etc, abundance of electrons, pi orbital electrons that don"t bond.
