8578
An ion - induced viscous flow model has been proposed to explain the influence of Ga ( + ) ion beam flux , substrate temperature , initial tube diameter , ion beam dwell time , and the incidence angle of the ion beam .
 Chemical: Ga ( + )
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: Ga ( + )