title:ELECTRON MOMENTUM PROFILES OF p ORBITALS OF 1,4-DIAZABICYCLO[2.2.2]OCTANE: DIRECT EXPERIMENTAL EVIDENCE OF THE THROUGH-BOND INTERACTION authors:Masahiko Takahashi, Motoaki Matsuo, and Yasuo Udagawa affiliations: Research Institute for Scientific Measurements, Tohoku University, Sendai 980-8577, Japan summary: Electron momentum spectroscopy has been applied for studying the nature of the two outermost p orbitals of diazabicyclo[2.2.2]octane. It is confirmed that the HOMO is totally symmetric, giving the direct experimental evidence of the through-bond interaction.