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21.
The reflectivity of red HgI2 in the spectral range of 2–10 eV at 100 K with E⊥c is studied and the optical constants are deduced by means of the Kramers and Kronig relations. It is evidenced that the valence band is split in two subbands. Furthermore reflectivity spectra on good natural surfaces at 15 K in the two polarizations have been measured, and a high energy excitonic series, characterized by a large value of the Rydberg, is found. 相似文献
22.
Khairy M. Hassan Mohamed S. K. Youssef Maher F. El-Zohry Raga Abo El-wafa 《Phosphorus, sulfur, and silicon and the related elements》2013,188(3-4):237-241
Abstract 2-Mercapto-3,5,7-triphenylpyrido[2,3-d]pyrimidine-4(3H)-one (II) was synthesized by the interaction of ethyl-2-amino-4,6-diphenylincotinate (I) with phenyl isothiocyanate in pyridine. The reaction of II with different reagents was carried out to give some condensed heterocyclic systems. 相似文献