Oxygen emission spectrum

Osmann et al. [33] investigated the Renner A X A" system of HO2, and used Eqs. (4—8) to represent their ab initio DMSs and TDMS (five surfaces) of this molecule computed with MRD-CI (Davidson-corrected) employing the cc-pVTZ basis sets both for oxygen and hydrogen atoms as well as the effective core potential (ECP) for oxygen. Emission spectrum at T =350 K was simulated, vibrational transition moments were eomputed and tabulated, see Fig. 4. 

When the aldehydes 92 and 95 are treated with oxygen and t-butoxide the emission spectrum of the chemiluminescence matches the fluorescence of a mixture of the acridone and the 9-carboxylate the latter being formed via an acyl anion. 

Bifluorophores consisting of two different fluorescent dyes linked by a flexible spacer containing heteroatoms (oxygen, nitrogen or sulfur atoms) can bind cations. This results in a decrease of the distance between the two fluorophores and, consequently, to an increase in efficiency of photoinduced energy transfer between the two moieties (Figure 2.13) provided that the emission spectrum of the donor (D) overlaps the absorption spectrum of the acceptor (A).(36) The transfer efficiency depends on the distance according to Forster s theory ... 

A. Schuster 8 found that the spectrum of ammonia in the discharge tube shows a broad, greenish-yellow band between 5688 and 5627. G. Magnanini observed the spectrum of the flame of ammonia burning in oxygen exhibits a large number of hydrogen lines. This spectrum was also observed by J. M. Eder, who measured 240 lines between A=5000 and 2262 for the extreme ultra-violet. The emission spectrum has seven characteristic bands—one between the red and ultra-violet. 

In 1894 Ramsay removed oxygen, nitrogen, water and carbon dioxide from a sample of air and was left with a gas 19 times heavier than hydrogen, very unreactive and with an unknown emission spectrum. He called this gas as argon. In 1895 he discovered helium as a decay product of uranium and matched it to the emission spectrum of an unknown element in the sun that was discovered in 1868. He went on to discover neon, krypton and xenon, and realized these represented a new group in the periodic table. 

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