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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >A photoelectron photoion coincidence study of the vinyl bromide and tribromoethane ion dissociation dynamics: Heats of formation of C2H3+, C2H3Br+C2H3Br+, C2H3Br2+, and C2H3Br3
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A photoelectron photoion coincidence study of the vinyl bromide and tribromoethane ion dissociation dynamics: Heats of formation of C2H3+, C2H3Br+C2H3Br+, C2H3Br2+, and C2H3Br3

机译：乙烯基溴和三溴乙烷离子解离动力学的光电子重合研究：C2H3 +，C2H3Br + C2H3Br +，C2H3Br2 +和C2H3Br3的形成热

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摘要

The threshold photoelectron photoion coincidence (TPEPICO) technique has been used to measure accurate dissociative photoionization onsets of vinyl bromide and 1,1,2-tribromoethane. The reactions investigated and their 0 K onsets are C2H3Br + hv -> C2H3+ + Br (11.902 +/- 0.008 eV); C2H3Br3 + hv -> C2H3Br2+ + Br (10.608 +/- 0.008 eV); and (C2H3Br3 + hv -> C2H3Br+ + 2Br (12.301 +/- 0.035 eV). The vinyl ion heat of formation (Delta H-f degrees K-298 = 1116.1 +/- 3.0 kJ/mol) has been calculated using W I theory and used as an anchor along with the measured dissociation energies to determine the heats of formation, Delta H-f degrees K-298, in kJ/mol, of the following bromine-containing species: C2H3Br (74.1 +/- 3.1), C2H3Br+ (1021.9 +/- 3.1), C2H3Br2+ (967.1 +/- 4.0), and C2H3Br3 (53.5 +/- 4.3). These results represent accurate and consistent experimental determinations of heats of formation for these bromine-containing species, which serve to correct the discrepancies in the literature for C2H3Br and C2H3Br+ and provide the first experimental determination for the enthalpies of formation Of C2H3Br2+ and C2H3Br3.
机译：阈值光电子光子重合（TPEPICO）技术已用于测量乙烯基溴和1,1,2-三溴乙烷的精确解离光电离起点。研究的反应及其0 K起始为C2H3Br + hv-> C2H3 + + Br（11.902 +/- 0.008 eV）; C2H3Br3 + hv-> C2H3Br2 + + Br（10.608 +/- 0.008 eV）; （C2H3Br3 + hv-> C2H3Br + + 2Br（12.301 +/- 0.035 eV）。乙烯基离子的形成热（ΔHf度K-298 = 1116.1 +/- 3.0 kJ / mol）已使用WI理论计算并使用作为锚定点以及测得的解离能来确定以下含溴物质的形成热Delta Hf度K-298，以kJ / mol为单位：C2H3Br（74.1 +/- 3.1），C2H3Br +（1021.9 + / -3.1），C2H3Br2 +（967.1 +/- 4.0）和C2H3Br3（53.5 +/- 4.3），这些结果代表了对这些含溴物质的形成热的准确一致的实验测定，这些结果可用来纠正溴化物中的差异。文献中有关C2H3Br和C2H3Br +的文献，并为确定C2H3Br2 +和C2H3Br3的生成焓提供了第一个实验方法。

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