Low temperature (10 K) spectra of amorphous a-C:N:H layers are reported for
the first time. The spectra reveal remarkable temperature effects dependen
t on the method of obtaining the material. The source of the observed effec
ts is found to be the presence of small amounts of oxygen in samples. The r
ole of internal stress is indicated. (C) 2001 Elsevier Science B.V. All rig
hts reserved.