13581
The theoretical study shows that , for an ideally trigonal Ni ( II ) complex , the orbital degeneracy leads to a first - order spin - orbit coupling that results in a splitting of the M ( s ) = +/- 1 and M ( s ) = 0 components of approximately - 600 cm ( - 1 ) .
 Ni ( II )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Ni ( II )