In the HD molecule of hydrogen, one nucleus is \({ }^{1} \mathrm{H}\left(\operatorname{spin} \frac{1}{2}ight)\) and the other is a deuteron \({ }^{2} \mathrm{H}\) (spin 1). What are the possible spin angular momentum states of the molecule? The two electrons are paired and assumed to be in a state \(j=0\).