20867
Assignments of observed Penning ionization electron / He I ultraviolet photoelectron spectra were consistent with the P3 calculation results for ionization of alpha and beta spin electrons except for electron correlation bands observed by PIES .
 Chemical: He
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: He