Photoelectrons are emitted when $4000\mathrm{ }\mathrm{Å}$ radiation is incident on a surface of work function $1.9 \mathrm{eV}$. These photoelectrons pass through a region having $\alpha$ -particles to form $\mathrm{H}{\mathrm{e}}^{+}$ ion, emitting a single photon. In this process, $\mathrm{H}{\mathrm{e}}^{+}$ ions thus formed are in their fourth excited state. The energy released during the combination of $\mathrm{H}{\mathrm{e}}^{+}$ ions is