Oxygen ground state

D) is an electronically excited oxygen atom. It can decay back to a ground state oxygen atom ( P) (which will regenerate an ozone molecule), or else it can react with water to produce two OH radicals ... 

As in 14-8, it is not the ground-state oxygen (the triplet), that reacts, but the excited... 

We will now discuss some very recent applications of the soft El ionization method for product detection in CMB experiments. We will first deal with two polyatomic reactions of ground state oxygen atoms with unsaturated hydrocarbons (acetylene and ethylene) these reactions are characterized by multiple reaction pathways and are of great relevance, besides being from a fundamental point of view, in combustion and atmospheric chemistry. 

Once produced, 3CAR can easily return to the ground state dissipating the energy as heat or it can be quenched physically via enhanced intersystem crossing by ground state oxygen, Scheme... 

The reactions of the ground-state oxygen atom 0(3P) with symmetric aliphatic ethers in the gas phase were investigated by Liu et al. (1990) using the flash photolysis resonance fluorescence technique. These reactions were found to be first-order with respect to each reactant. The rate constants for three ethers at several temperatures are as follows ... 

Another difficulty was apparent in the early chemical studies on polluted air. It was known from laboratory studies that both ozone and the ground-state oxygen atoms that are formed in Reaction 2-1 would attack reactive hydrocarbons. However, the experimentally observed rate of loss of the hydrocarbons was often greater an could be explained by the attack of ozone and oxygen atoms. Figure 2-5 shows this effect for the case of propylene. Note that the discrepancy is especially large in the earlier parts of the reaction. 

The standard astm test method (D-1149-64) for rubber damage includes a test chamber (volume, 0.11-0.14 m ) through which ozonized air flows at a rate greater than 0.6 m/s. Because the residence time of the ozonized air in the test chamber is about 1 s, the ozone may be expected to reach the material in about 0.1 s. A somewhat similar test procedure (aatcc test method 109-1972 ansi L14, 174-1973) is used in testing colorfastness. The ozone generator is usually (but not necessarily) a mercury-vapor resonance lamp with emission lines at 184.9 and 253.7 nm. The 184.9-nm line is absorbed, and two ground-state oxygen atoms are produced ... 

In addition, the ground-state oxygen atom reacts with ozone ... 

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