30023
Using photoelectron - photoion coincidence imaging spectroscopy at variable photon energies ( 20 - 25eV ) , we compare the rates of charge - transfer to Penning ionization of the dopants in the two cases .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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