upward

Lattice dynamics

Zallen R, Slade M L, Ward A T, Lattice vibrations and interlayer interactions in crystalline As2S3 and As2Se3, PRB 3, 4257 (1971)

Optoacoustical effects

Claytor T N, Sladek R J, Excess ultrasonic attenuation in As2S3 glass after electric field removal, PRL 42, 1482 (1979)

Claytor T N, Sladek R J, Ultrasonic velocities in amorphous As2S3 and As2Se3 between 1.5 and 296 K, PRB 18, 5842 (1978)

Thermal conductivity

Specific heat

N Ahmad, K W Hutt and W A Phillips, Low-frequency vibrational states in As2S3 glasses, JPC 19, 3765 (1986)

Raman scattering

B Schmid, W Schirmacher, Raman scattering and the low-frequency vibrational spectrum of glasses, PRL 100, 137402 (2008)