Low-frequency light scattering spectra of As2S3 glass former have been investigated over a temperature range of 300–712 K. Using the model of a damped oscillator, the parameters of the intensities of the boson peak and of the fast relaxation as well as the boson peak position and the relaxational time are extracted as a function of temperature. The temperature increase of the fast relaxation becomes more sharp above Tg and stabilizes at T = 600 K. By analogy with other glass formers it is suggested that the critical temperature Tc within the framework of the mode-coupling theory should be near 600 K for As2S3. It was found that the damping parameter at Tc is the same for As2S3 and B2O3; an explanation of this coincidence is suggested. The boson peak is found to be present up to 712 K with almost the same strength as at low temperatures.

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