J. Paraszczak, J.M. Shaw, et al.
Micro and Nano Engineering
We report here on the optical absorption of TmTe films (5<T<300 K; 0.2<h<4.5 eV) and the reflectance (0.2<h<20 eV) and ultraviolet photoemission spectra (UPS; 15h90 eV) of vacuum- and air-cleaved TmTe single crystals. Much of the structure seen in absorption and reflectance spectra can be attributed to transitions from Tm2+, e.g., the first absorption band centered at 0.7 eV is identified as due to a transition from Tm2+ 4f134f12(H63)5d(t2g). No optical structure was seen which would permit us to identify Tm3+ in TmTe. The UPS data show a small amount of Tm3+ which was, however, strongly influenced by surface conditions in spite of in situ study in a vacuum of 10-10 Torr. We conclude that Tm is essentially divalent in TmTe. © 1975 The American Physical Society.
J. Paraszczak, J.M. Shaw, et al.
Micro and Nano Engineering
Ronald Troutman
Synthetic Metals
Kigook Song, Robert D. Miller, et al.
Macromolecules
Arvind Kumar, Jeffrey J. Welser, et al.
MRS Spring 2000