If Mössbauer spectrum of $\mathrm{Fe}(\mathrm{CO})_{5}$ is recorded in the presence of a magnetic field, the original spectrum with two lines changes into the one with
(a)Three lines
(b)Four lines
(c)Five lines
(d)Six lines
Answer
Answer: D ✓ checked by 4AB · confidence medium
Explanation
In a magnetic field the ⁵⁷Fe ground (I = ½) and excited (I = 3/2) levels both split, giving six allowed Δm = 0, ±1 lines (d).