3393
In the case of open-shell atoms with degenerate energy levels , one could define a dipole moment by the aid of the first-order Stark effect .
 person: Stark
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Stark