Nitrogen single crystal absorption

Figure 10. Nitrogen-15 isotopic shift in the ir-polarized, single-crystal absorption spectrum of CsU02(N03)3 at 4.2K...

The absorption of light by semiconductors cremes electron-hole pairs e h+) which can be separated because their components diffuse in different directions. The energies of these moieties can be stored by several mechanisms or used in photocatalysis or photosynthesis for nitrogen fixation, formation of amino acids, methanol, etc. The efficiencies of such conversions depend almost entirely upon the semiconductor material, and as yet these efficiencies are too low for significant application. Currently the most promise is demonstrated by the use of titania on a platinum substrate or single crystals of strontium titanate. See also Photoelectric Effect. 

The absorption spectrum of Cp3Nd(NCCH3) in a single crystal form at liquid nitrogen temperatures showed a truncated crystal field splitting pattern could be derived. The parameters of an empirical Hamiltonian were fitted [41] with the energies of 41 levels with a root mean square deviation of 26 cm1. 

The matrix-isolated spectra of HNCO, DNCO, HNCS, and DNCS in the far-i.r. (10—50 cm ) and of the CNO anion in the i.r. (550— 5000 cm ) have been recorded. The acid molecules were isolated in both argon and nitrogen matrices at 13 K although no absorptions attributable to the guest molecules were observed in the nitrogen matrix, intense bands were recorded in the argon matrix. These bands are best explained by rotation of the molecule about an axis close to the axis of least inertia. Isotopically enriched cyanate anions have been prepared by direct oxidation reactions and introduced into KCl and KBr single crystals to a maximum concentration of ca. 5 wt. The i.r. spectra of the resultant cyanate ion isotopic species show that these ions are dissolved in the form of a solid solution. 

FAR INFRARED ABSORPTION SPECTRA OF ORGANIC MONOCLINIC SINGLE CRYSTALS AT LIQUID NITROGEN TEMPERATURE. 

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