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Photochemistry - How can there be a second singlet state?

  1. Dec 1, 2012 #1
    I'm reading about photochemistry at the moment and heres what I read:
    I don't understand. How can it jump to a singlet state? For example, if I irradiate the molecule and an electron jumps from its orbital to a higher energy unoccupied orbital, then that excited electron will be unpaired so its no longer a singlet. Are they saying that two paired electrons jump at the same time?
  2. jcsd
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