Excited oxygen

Figure 6. Fluorescence emission spectra of polypropylene films at 340 nm a. Treated with ozone only b. ozone and UV light (L2) c. UV-irradiated (L2) in oxygen. Excitation wavelength 240 nm.

Strong evidence in favor of mechanism B was obtained when it was discovered that singlet oxygen produced chemically by the reaction of hydrogen peroxide and sodium hydrochlorite or from gaseous oxygen excited by an electrodeless discharge yields the same products as the direct photolysis/85-8 ... 

Laboratory studies of effects of photochemical oxidants other than ozone—e.g., PAN, peroxybenzoylnitrate, atomic oxygen, excited molecular oxygen, Oj( A ), and hydroperoxy and hydroxyl radicals—on specific materials should be conducted. 

Figure 10. Emission spectra, 600-750 nm, obtained from MgTPP thin film (a) evacuated and Cb) exposed to 150 torr of oxygen. Excitation wavelength was 400 nm.

This study was repeated using synchrotron radiation for excitation and extended to include the oxygen pi resonance (Murakami et al. 1986). Based on this concept of localized relaxation, excitation of an oxygen Is electron was expected to produce a yield of atomic ions similar to that for excitation of the terminal nitrogen, and the yield of O" and Nj should be high and the yield of NO" should be low. Contrary to this expectation, 75% of the ions produced with oxygen excitation were atomic ions, identical to the result obtained for excitation of the Is electron of the central nitrogen, and the... 

Oxygen, Excited Chromophores and Charge-Transfer-Complexes. 139... 

Figure 10-3. Luminescence spectra of PtOEP immobilized in poly-IBM -co-TFEMjjg (a), poly- Styi-co-TFEMo.62 film (b) and poly-Styi-co-PFSo.21 film (c). (1) 100% argon (2) 20% oxygen and (3) 100% oxygen. Excitation wavelength was 535.0 nm.

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