If $\langle\alpha| \hat{\mathrm{S}}_{\mathrm{x}} \hat{\mathrm{S}}_{\mathrm{y}}-\hat{\mathrm{S}}_{\mathrm{y}} \hat{\mathrm{S}}_{\mathrm{x}}|\alpha\rangle=\mathrm{i} \hbar^{2} \mathrm{a}$, where $\hat{\mathrm{S}}_{\mathrm{x}}$ and $\hat{\mathrm{S}}_{\mathrm{y}}$ are spin angular momentum operators and $|\alpha\rangle$ is spin up eigen function, then the value of 'a' is ____ (Round off to one decimal place)
Answer
SELF-PRACTICE — the source book printed no answer.
Nothing is invented here, so this question has no answer on record.