Abstract
Angular-resolved photoelectron spectra (ARPES) are presented for GeS using 21-eV excitation energy. From the measurements that cover a wide range of angles along the two principal directions in the basal plane of the orthorhombic layered compound GeS $E$ vs ${\stackrel{\ensuremath{\rightarrow}}{\mathrm{k}}}_{\ensuremath{\parallel}}$ curves were constructed. The band structure of GeS was calculated utilizing the empirical pseudopotential method. The $E$ vs ${\stackrel{\ensuremath{\rightarrow}}{\mathrm{k}}}_{\ensuremath{\parallel}}$ curves can almost completely be understood in terms of this band structure under the assumption that only peaks in the one-dimensional density of states along ${k}_{\ensuremath{\perp}}$ contribute significantly to the ARPES spectrum.
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