Schrödinger-Gleichung

$\mathfrak{i}{\partial }_t\mathrm{\Psi }=\hat{H}\mathrm{\Psi },\hat{H}=-\frac{\mathrm{\Delta }}{2m}$ Failed to parse (unknown function "\hspace"): {\displaystyle \langle \psi \hspace{0.5ex} | }