Excitation transfer cross sections for levels of the Ne ${2p}^{5}3d$ configuration

We have measured electron-impact optical emission cross sections for selected resonance and nearby nonresonant levels of the neon ${2p}^{5}3d$ configuration at pressures from 2 to 70 mTorr. The enhanced fluorescence observed from nonresonant levels at high pressures is consistent with excitation transfer from highly populated resonance levels of the ${2p}^{5}3d$ configuration. We measured excitation-transfer cross sections of $540\pm 80\hspace{0.5em}{\mathrm{\AA }}^2,$ $1600\pm 500\hspace{0.5em}{\mathrm{\AA }}^2$, and $1100\pm 200\hspace{0.5em}{\mathrm{\AA }}^2$ for transfer from the ${3d}_5\to {3d}_6,$ ${3s}_1^{\prime }\to {3s}_1^{″},$ and ${3s}_1^{\prime }\to {3s}_1^{}$, respectively.