Crossed molecular beam study on O(1D) + N2O
Date Issued
2005
Date
2005
Author(s)
Lu, Yu-Ju
DOI
zh-TW
Abstract
This thesis is divided into three sections. The first section is that the reaction of O(1D) with nitrous oxide, N2O, has been investigated using the crossed molecular beam technique. There are two exothermic product channels：NO + NO and N2 + O2. The former produces two kinds of NO molecules, an “old” NO which already exists in the N2O molecule and a “new” NO which is newly formed in the reaction. Using the isotope labeled 18O(1D) with mass spectrometric detection, we could distinguish the “old” and “new” NO molecules. The product time-of-flight spectra and angular distributions have been measured for 30NO, 32NO, and 34O2 at a collisional energy of 7.8 kcal/mol. The translational energy distributions of the two product channels could be obtained. From the reaction energetics, the product total internal energy could be determined for both channels. We also searched for the isotope exchange reaction channel, 18O(1D) + 44N2O → 16O(1D,3P) + 46N2O, but its yield is below our detection limit.
The second section is about the reaction of F2 with CH3SCH3 (Dimethyl Sulfide, DMS) by using the same technique. The signals at m/z = 80 have been detected. The angular distribution is significantly forward respect to DMS. It is a surprise that the rate constant of two closed shell molecules might be as fast as a radical reaction. The reaction mechanism is supposed to form a charge-transfer complex because of low ionization potential of DMS and high electron affinity of F2.
The final section is about the calibrations of machine parameters. The machine parameters are calibrated by photodissociation of a series of molecules, which provide the basis to analyze our data.
Subjects
交叉分子束
牛頓圖
crossed molecular beam
newton diagram
Type
thesis
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