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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Theoretical Investigation of the Kinetics for the Reactions of Atomic Hydrogen with GeH_((4-n))Cl_n (n = 0, 1, 2, 3)
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Theoretical Investigation of the Kinetics for the Reactions of Atomic Hydrogen with GeH_((4-n))Cl_n (n = 0, 1, 2, 3)

机译:原子氢与GeH _((4-n))Cl_n(n = 0、1、2、3)反应动力学的理论研究

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摘要

The reactions of H atoms with GeH_4, GeH_3Cl, GeH_2Cl_2, and GeHCl_3 have been studied systematically using ab initio molecular orbital theory. Theoretical analysis provides conclusive evidence that the main process occurring in each case is hydrogen abstraction from the Ge-H bonds. The reaction thermal rate constants for the temperature range 200-3000 K are deduced by canonical variational transition state theory (CVT) with small curvature tunneling (SCT) correction method. The CVT/SCT rate constants exhibit typical non-Arrhenius behavior. Three-parameter rate-temperature formulas have been fitted as follows: k_1 = 3.09 * 10~(-17)T~(2.16) exp(-286.74/T), k_2 = 1.94 * 10~(-17)T~(2.18) exp(-276.82/T), k_3 = 4.19 * 10~(-18)T~(2.37) exp(-227.64/T), and k_4 = 2.02 * 10~(-17) T~(1.98) exp(-218.51/T) for the reactions of H with GeH_4. GeH_3Cl, GeH_2Cl_2, and GeHCl_3, respectively (in units of cm~3 molecule~(-1) s~(-1)). Studies show that chlorine substitution has a very slight effect on the strength and reactivity of the Ge-H bonds in GeH_((4-n))Cl_n (n = 1 - 3).
机译:利用从头算分子轨道理论系统地研究了H原子与GeH_4,GeH_3Cl,GeH_2Cl_2和GeHCl_3的反应。理论分析提供了确凿的证据,表明在每种情况下发生的主要过程是从Ge-H键中提取氢。通过典型的变分过渡态理论(CVT)和小曲率隧穿(SCT)校正方法,得出了200-3000 K温度范围内的反应热速率常数。 CVT / SCT速率常数表现出典型的非阿累尼乌斯行为。三参数速率-温度公式已拟合为:k_1 = 3.09 * 10〜(-17)T〜(2.16)exp(-286.74 / T),k_2 = 1.94 * 10〜(-17)T〜(2.18) )exp(-276.82 / T),k_3 = 4.19 * 10〜(-18)T〜(2.37)exp(-227.64 / T),k_4 = 2.02 * 10〜(-17)T〜(1.98)exp( -218.51 / T),用于H与GeH_4的反应。 GeH_3Cl,GeH_2Cl_2和GeHCl_3(以cm〜3分子〜(-1)s〜(-1)为单位)。研究表明,氯取代对GeH _((4-n))Cl_n(n = 1-3)中Ge-H键的强度和反应性影响很小。

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