Molecules with 100 or so electrons to annihilate faster

  • Thread starter talanum1
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I think the reason for molecules with 100 or so electrons to annihilate faster with a positron is because the electrons are quantum mechanicly smeared across a larger area.
 

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Astronuc
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Positron lifetime is highest in polymers and insulators, shortest in metals. See slide 13 in
http://www.positronannihilation.net/Index_files/positron lifetime.pdf
Bob S
Polymers are mostly CmHn or CmHnOp and insulators are metal oxides, usually richer in oxygen. C, H and O have relatively low electron density, as opposed to metals, from period 4 and greater, have much greater electron density - which means greater LET (linear energy transfer) or greater stopping power, and more electrons with which to annihilate
 

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