5340
The C vacancy enhances the adsorption energy of Ti , in contrast to that of H ( 2 ) .
 Chemical: C; Chemical: Ti; Chemical: H ( 2 )
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: C; Chemical: Ti; Chemical: H ( 2 )