Discuss the following mass spectrum:
$\frac{m}{z}$ $=$ $18$ $\Rightarrow$ $H_2O^+$ $\frac{m}{z}$ $=$ $17$ $ \Rightarrow $ $HO^+$ $\frac{m}{z}$ $=16$ $\Rightarrow$ $O^+$
What is this substance?
Water $H_2O$
