The vacuum ultraviolet (VUV-) photochemical oxidation of dimethylamine in the gas phase was investigated in the presence and absence of molecular oxygen and water vapor. Primary intermediate products of the oxidative degradation were identified by the combination of gas chromatography and mass spectrometry (GC/MS), and the product distribution was determined for different experimental conditions. The evolution of the substrate concentration was followed by on-line gas chromatography. The production of CO
A systematic study of a Broida source producing atomic calcium in ground state 1S and first metastable 1D and 3P states is presented. The relative concentration of the metastables, produced by a DC discharge, is monitored with carrier gas pressure, heating power and discharge current, and it is observed that low values of these parameters are favourable to 1D formation. These results are interpreted in terms of relative values of cross section of energy pooling forming the first resonant state 1P, and the ratio of these cross section is estimated to be σ(3P-3P)/σ(1D-1D) ≠5 ×10-4. Some properties of the source are described, including auto-absorptions of transitions originating from the 3P and collisional relaxation of reaction products of Ca with halogenated compounds. An example of utilization of the source for the study of metastable reactivity is presented
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