20868
Negative collision energy dependence of partial Penning ionization cross - sections ( CEDPICS ) indicate attractive interaction with He * ( 2 ( 3 ) S ) around the molecule .
 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