9322
The structural , electronic and magnetic properties of neutral and anion Fe2S2 , Fe3S4 and Fe4S4 have been investigated with the aid of previous photoelectron spectroscopy and density functional theory calculations .
 Chemical: Fe2S2; Chemical: Fe3S4; Chemical: Fe4S4
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: Fe2S2; Chemical: Fe3S4; Chemical: Fe4S4