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 annihilateBob S said: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
Molecules with a large number of electrons have been found to exhibit unique properties and behaviors that can be useful in various scientific fields, such as materials science and pharmacology.
Molecules with a high number of electrons tend to have a high density of electron states, which can lead to faster annihilation rates when exposed to certain conditions, such as high energy radiation or collisions with other particles.
The annihilation rate of molecules with 100 or so electrons can be influenced by various factors, such as molecular structure, electronic configuration, and external stimuli like temperature and pressure.
Yes, scientists have been able to manipulate the annihilation rate of these molecules by using different techniques, such as altering the molecular environment or introducing specific catalysts.
Molecules with a high number of electrons have shown promise in areas such as energy storage, drug delivery, and even quantum computing, making them a topic of ongoing research and exploration in the scientific community.