Rotational spectroscopy of rare iron monoxide isotopologues: A mass-independent analysis

We present pure rotational transitions of the rare iron monoxide isotopologues. 57 F e 16 O , 58 F e 16 O and 56 F e 18 O in their lowest spin states 5 Δ 4 . For 57 F e 16 O , the rotational spectr...