Abstract
The population dynamics of different energy states of sensitizer molecules under intense laser irradiation was studied taking account of triplet-triplet absorption and intersystem crossing between highly excited states. It is shown which quantum states are predominantly populated under the given irradiation conditions. It was found that the efficiency of energy transfer from high electronic levels of xanthene dyes in the media containing Escherichia coli or Bacillus subtilis bacteria is very low and this bacteria inactivation channel can be ignored when describing the mechanisms of damage to pathogenic microorganisms in the presence of photosensitizers.
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