Internuclear Distances inSe2,Te2, and HgCl by Electron Diffraction

Electron diffraction photographs have been obtained from the gas molecules ${\mathrm{Se}}_2$, ${\mathrm{Te}}_2$, and HgCl. The internuclear distances found for ${\mathrm{Se}}_2$ and ${\mathrm{Te}}_2$ were 2.19±0.03A and 2.59±0.02A, respectively, while for HgCl a separation of 2.23±0.03A was obtained. Additional photographs were taken of Hg${\mathrm{Cl}}_2$ indicating an Hg-Cl distance of 2.27±0.03A near to the above value for HgCl. Comparison is made with band spectrum data on the internuclear distances for ${\mathrm{Se}}_2$ and ${\mathrm{Te}}_2$.