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Using a Hartman - Hahn protocol , we demonstrate spin polarization transfer from a single , optically polarized nitrogen - vacancy ( NV ) center to the ensemble of paramagnetic defects hosted by an individual diamond nanocrystal .
 Chemical: nitrogen; Chemical: diamond
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: nitrogen; Chemical: diamond