We　prepared　five　samples　of　chemically　stoichiometric　GexAsySe1-x-y　glasses　in　order　to　examine　whether　homopolar　bonds　exist　in　these　glasses.　It　is　generally　accepted　that　the　structure　of　these　chemically　stoichiometric　glasses　should　be　dominated　by　GeSe4/2　tetrahedra　and　AsSe3/2　pyramids　with　a　negligible　quantity　of　homopolar　bonds.　Analysis　of　Raman　scattering　and　X-ray　photoelectron　spectra　of　the　glasses　indicates　that,　while　glasses　located　at　the　center　of　the　glass-forming　region　primarily　contain　heteropolar　bonds,　a　considerable　number　of　homopolar　bonds　exists　in　glasses　with　extremely　high　Ge　or　As　concentrations.　This　demonstrates　that　the　formation　of　homopolar　bonds　might　be　intrinsic　to　chemically　stoichiometric　chalcogenide　glasses.　(C)　2015　The　Japan　Society　of　Applied　Physics