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A study of the atmospherically relevant reaction between molecular chlorine and dimethylsulfide (DMS): establishing the reaction intermediate and measurement of absolute photoionization cross-sections
In a study using UV photoelectron spectroscopy (PES) of the atmospherically relevant reaction CH3SCH3 + Cl-2, CH3SCH2Cl +HCl bands associated with a reaction intermediate have been observed. These have been assigned to ionization of the covalently bound molecule (CH3)(2)SCl2 on the basis of the intensity of the observed bands as a function of reaction time, molecular orbital calculations of vertical ionization energies and evidence from infrared spectroscopy. A method has also been developed, with the flow-tube/PE spectrometer combination used, to measure photoionization cross-sections of the reagents and products at the photon energy utilized and this has allowed the photoionization cross-section of the intermediate to be estimated. This work augments an earlier study in which the rate constant of the reaction between CH3SCH3 (DMS) and Cl-2 has been measured at room temperature
Multi-dimensional Limiting Process on Triangular and Tetrahedral Meshes
The present paper deals with the continuous work of extending multi-dimensional limiting process (MLP), which has been quite successfully proposed on two- and three-dimensional structured meshes, onto the unstructured meshes. The basic idea of the present limiting strategy is to control the distribution of both cell-centered and cell-vertex physical properties to mimic a multi-dimensional nature of flow physics, which can be formulated as so called the MLP condition. The MLP condition can guarantee a high order spatial accuracy without yielding spurious oscillations. Starting from the MUSCL-type reconstruction on unstructured meshes followed by the efficient implementation of the MLP condition, MLP slope limiters on unstructured meshes are proposed. Through various numerical analyses and extensive computations, it is observed that the proposed limiters are quite effective in controlling numerical oscillations and very accurate in capturing both discontinuous and continuous multi-dimensional flow features on 2-D triangular meshes and 3-D tetrahedral meshes.The authors appreciate the financial supports provided by the second stage of the Brain Korea 21 Project for
Mechanical and Aerospace Engineering Research at Seoul National University, the KARI under KHP Dual-Use
Component Development Program funded by the MKE, and by Agency for Defense Development