30022
In this work we excite or ionize doped He droplets using synchrotron radiation and study the effect onto the dopant atoms depending on their location inside the droplets ( rare gases ) or outside at the droplet surface ( alkali metals ) .
 Chemical: He; Chemical: alkali metals
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: He; Chemical: alkali metals