25652
Zero - phonon hole widths obtained for the Chl b band at 638 . 5 nm ( 5 K ) revealed two independent Chl b --> Chl a EET times , i . e . , 4 +/- 0 . 5 ps and 0 . 4 +/- 0 . 1 ps .
 Chemical: Chl b; Chemical: Chl b; Chemical: Chl a
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: Chl b; Chemical: Chl b; Chemical: Chl a