Thus ammonia molecule belongs to the C3v point group that has order 6 : an identity element E , two rotation operations C3 and C32 , and three mirror reflections σv , σv ' and σv '' .
Thus ammonia molecule belongs to the C3v point group which has order 6 : an identity element E , two rotation operations C3 and C32 , and three mirror reflections σv , σv ' and σv '' .