26300
From high - resolution measurements of the hyperfine splitting in its fundamental rotational transition , the rotational constant ( B + C ) / 2 and the quadrupole tensor element chi aa ( N ) for both nitrogen atoms have been precisely determined .
 Chemical: N; Chemical: nitrogen
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: N; Chemical: nitrogen