Vibrational ozone

FIdthmann H, Beck C, Schinke R, Woywod C and Domcke W 1997 Photodissociation of ozone in the Chappuis band. II. Time-dependent wave packet calculations and interpretation of diffuse vibrational... 

A recent study of the vibrational-to-vibrational (V-V) energy transfer between highly-excited oxygen molecules and ozone combines laser-flash photolysis and chemical activation with detection by time-resolved LIF [ ]. Partial laser-flash photolysis at 532 mn of pure ozone in the Chappuis band produces translationally-... 

In the case of ozone, for which both the Hartley and Huggins systems are very broad showing no rotational and very little vibrational structure, the two wavelengths must be more widely separated. 

Monomeric neutral SO4 can be obtained by reaction of SO3 and atomic oxygen photolysis of S03/ozone mixtures also yields monomeric SO4, which can be isolated by inert-gas matrix techniques at low temperatures (15-78 K). Vibration spectroscopy indicates either an open peroxo Cj structure or a closed peroxo C2v structure, the former being preferred by the most recent study, on the basis of agreement between observed and calculated frequencies and reasonable values for the force constants ... 

Then the O atoms, which are reactive radicals with two unpaired electrons, react with the more abundant 02 molecules to form ozone. The ozone molecules are created in such a high-energy state that their vibrational motions would quickly tear them apart unless another molecule, such as 02 or N2, collides with them first. The other molecule, indicated as M, carries off some of the energy ... 

Fig. 3. Total kinetic energy distribution for O3 — C Ag) + 0(1D2). Also shown at each wavelength is a comb corresponding to each vibrational level with no rotational excitation. The peaks observed in the 305 nm image are due to rotational structure. The small peak at 0.19eV in the 305nm image is due to an ozone hot band .

Table 1. Vibrational populations of 02(1AS) from the photodissociation of ozone with light of wavelength A.

It is unclear exactly how the two potential surfaces, and hence the interaction regions between them, behave as the parent molecules bend. Our experimental results indicate that the more bent the ozone molecules are as they dissociate the more effectively is the available energy channelled into the OA T, ) fragment vibration. It is possible that as the parent molecules bend, the crossing seams move to a region on the repulsive state that more strongly favors the production of vibrationally excited 02(3 ) fragments. 

Vibrational overtone bands within the ground electronic state of OH, known as Meinel bands, result from the reaction of H atoms with ozone,... 

Ozone layer depletion, stratospheric, 21 525-529 Ozone level, reduction in, 21 528 Ozone molecules, vibrationally excited, 27 774... 

A knowledge of the kinetics of the decomposition of ozone is essential for the understanding of the chemistry of some important processes which occur in earth s atmosphere. Yet, in spite of numerous studies and the structural simplicity of ozone, the mechanism of its ultraviolet photolysis is still uncertain. Electronically and vibrationally excited species are involved in ozone decomposition and the current knowledge of the chemical behavior of such intermediates is still in its infancy. 

The Vibrational Energies of Ozone up to the Dissociation Threshold Dynamics Calculations on an Accurate Potential Energy Surface. 

Benjamin, I., Levine, R. D., and Kinsey, J. L. (1983), The High-lying Vibrational Levels of Ozone via an Algebraic Approach, J. Phys. Chem. 87, 727. 

O. Hino, T. Kinoshita, G. K.-L. Chan, and R. J. Bartlett, Tailored coupled cluster singles and doubles method applied to calculations on molecular structure and harmonic vibrational frequencies of ozone. J. Chem. Phys. 124, 114311 (2006). 

Formation of a jr-complex between 1-hexene or 2,4,4-trimethylpent-l-ene and ozone was tentatively proposed based on the appearance of a sharp band at ca 980 cm , assigned to one of the ozone vibrations . However, the existence of olefin-ozone jt-complexes has been contested . 

Finlayson, B. J., J. N. Pitts, Jr., and H. Akimoto, Production of Vibrationally Excited OH in Chemiluminescent Ozone-Olefin Reactions, Chem. Phys. Lett., 12, 495-498 (1972). 

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