A strong increase in the efficiency of isotope-selective infrared laser dissociation of molecules (by an example of CF₂HCl) under nonequilibrium thermodynamic conditions in a shock wave has been reached by using a mixture with a resonantly absorbed gas (CF₃Br). It has been shown that the dissociation yield of CF₂HCl molecules irradiated in a mixture with CF₃Br molecules is more than a factor of 5–10 higher than the dissociation yield in the case of their irradiation in the form of pure gas. The dissociation threshold of CF₂HCl molecules in the mixture with CF₃Br molecules also decreases significantly from ≈1.5−2.0 to 0.2−0.3 J/cm²). This allows the efficient isotope-selective infrared dissociation of molecules at low exciting energy densities (Φ≤ 1.0−1.5 J/cm²), as well and increasing the selectivity of the process. The method has been described and the first results have been presented. The dissociation of CF₂HCl molecules selective in the ³⁵Cl and ³⁷Cl isotopes with the enrichment factor K _enr(³⁵Cl/³⁷Cl) = 0.90 ± 0.05 is implemented when a CF₂HCl/CF₃Br = 1/1 mixture is irradiated by the 9R(30) (1084.635 cm⁻¹) line of a CO₂-laser at an energy density of Φ ≈ 1.3 J/cm².

中文翻译：

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通过使用具有共振吸收气体的混合物，在非平衡热力学条件下，在冲击波下，分子的同位素选择性红外激光解离效率大大提高

通过使用具有共振吸收气体（CF ₃ Br）的混合物，在冲击波的非平衡热力学条件下，分子的同位素选择性红外激光解离效率（例如CF ₂ HCl）大大提高。研究表明，与CF ₃ Br分子混合时，辐照的CF ₂ HCl分子的离解产率比以纯气体形式辐照时的离解产率高5-10倍。与CF ₃ Br分子混合的CF ₂ HCl分子的解离阈值也从≈1.5-2.0显着降低至0.2-0.3 J / cm ²）。这样可以在低激发能密度（Φ≤1.0-1.5 J / cm ²）下有效地进行分子的同位素选择性红外解离，并提高了过程的选择性。已经描述了该方法，并且已经给出了第一结果。当CF ₂ HCl / CF ₃ Br = 1/1的混合物为CF2 HCl / CF ₃ Br = 1/1时，在³⁵ Cl和³⁷ Cl同位素中选择性富集系数 K _enr（³⁵ Cl / ³⁷ Cl）= 0.90±0.05的CF ₂ HCl分子解离。由CO ₂的9R（30）（1084.635 cm ^-1）线照射能量约为Φ≈1.3 J / cm ^2的激光。