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Abstract
The absorption coefficient of GeS at the absorption edge behaves according to Urbach's rule. The electron-phonon interaction involves all LO phonon modes expected in the directions studied. The phonon involved in the b-axis direction has a frequency value equal to 0.034 eV while for the three LO phonons in the a-axis direction the values 0.015, 0.040 and 0.444eV were found respectively. A comparison with results for isomorphic GeSe indicates that the ionic trend obtained using the electron-phonon coupling constant σ 0 agrees with the trend which is established using ionicity values from Philip's scale.
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