Photodarkening and photostructural effects in glassy As2Se3

The density, nanohardness and some optical properties of As–S and As–Se chalcogenide bulk glasses and thin films

“…3A-C). We note that for As 2 Se 3 quite small structural differences inferred from Raman spectroscopy between the bulk and virgin thin lm in the work by Němec et al 10 and Treacy et al 52 were also found. For large structural differences for As 2 S 3 , see Fig.…”

Photoinduced structural changes and related phenomena in amorphous arsenic chalcogenides

“…We next discuss experimental investigations on reversible photoinduced effects in previously annealed films. Two sensitive experimental techniques, namely nuclear quadrupole resonance spectroscopy [53] and Raman spectroscopy (see present Raman data), failed to detect any gross changes in the local bonding configuration. However, other structural probes, namely infrared absorption [28] and differential anomalous x-ray scattering [54], show that small changes do occur under illumination.…”

The application of frequency swept pulses for the acquisition of nuclear quadrupole resonance spectra

“…For example, Taylor et al have extensively studied arsenic-containing glasses with 75 As NQR and have found that the resonances of some samples span several MHz in breadth, as opposed to resonances in ordered solids which are typically several kHz in breadth [39][40][41][42][43]. The limited excitation bandwidths associated with standard, highpower, rectangular pulses utilized in the Hahn-echo sequence make it necessary to increment the transmitter frequency in order to collect such broad NQR spectra [44].…”