18242
The optical spectrum of the linear CuCCH molecule has been investigated for the first time , using resonant two - photon ionization spectroscopy employing ArF ( 193 nm ) or F2 ( 157 nm ) excimer radiation for photoionization .
 Chemical: CuCCH; Chemical: ArF; Chemical: F2
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: CuCCH; Chemical: ArF; Chemical: F2