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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Precise Equilibrium Constants from Spectrophotometric Data: BrCl in Br_2/Cl_2 Gas Mixtures
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Precise Equilibrium Constants from Spectrophotometric Data: BrCl in Br_2/Cl_2 Gas Mixtures

机译:分光光度数据的精确平衡常数:Br_2 / Cl_2混合气体中的BrCl

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摘要

The equilibrium constant for the reaction, Br_2(g) + Cl_2(g) <-> BrCl(g), is estimated using the classic spectrophotometric method with precise data and a multispectrum fitting approach. Analysis of spectra for 18 Cl_2:Br_2 mixing ratios yields K° = 9.1 AT 22 ℃, with a nominal statistical error (1 σ) of 0.04. This error translates into a remarkable precision of 0.4 cm~(-1) in the dissociation energy of BrCl, easily beating that for the current best spectroscopic estimate (±5 cm~(-1)). However, a sensitivity analysis shows that K° is susceptible to small systematic errors and minor changes in the least-squares fit model, leading to a more conservative estimate of 2% error. The derived K° is consistent with statistical mechanical estimates that employ the current value for the BrCl dissociation energy, but it differs considerably from some recently measured and used values, which range from 6.4 to 10.4. The revised estimate of the BrCl dissociation energy is D_e = 18 248 ± 2 cm~(-1).
机译:反应的平衡常数Br_2(g)+ Cl_2(g)→BrCl(g),是使用经典的分光光度法,精确数据和多光谱拟合方法估算的。分析18种Cl_2:Br_2混合比的光谱,在22℃时K°= 9.1,名义统计误差(1σ)为0.04。该误差转化为BrCl的离解能达到0.4 cm〜(-1)的显着精度,轻松超过了当前最佳光谱估计值(±5 cm〜(-1))。但是,敏感性分析表明,K°容易受到系统误差和最小二乘拟合模型中微小变化的影响,从而导致2%误差的估计更为保守。得出的K°与采用BrCl解离能的当前值的统计机械估计值一致,但它与一些最近测量和使用的值(6.4到10.4)有很大差异。 BrCl离解能的修正估计为D_e = 18248±2 cm〜(-1)。

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