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Theoretical Investigation of the Ground X~3∑~- State of Nitrogen Bromide

机译:溴化氮X〜3∑〜-基态的理论研究

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The spectroscopic constants and the dissociation energy of the ground X~3∑~- state of NBr have been computed using correlated wave functions and correlation-consistent orbital basis sets up to quintuple ξ quality. Our best estimates for the equilibrium separation (r_e) is 1.780 A and for the dissociation energy (D_e) 49.5 kcal/mol, suggesting that previous estimates obtained from indirect experimental measurements are in error by as much as 15 kcal/mol. The spectroscopic constants computed at the RCCSD(T)/aug-cc-pV5Z level of theory are ω_e = 694.5 cm~(-1), ω_eX_e = 4.14 cm~(-1), and α_e = 0.0039 cm~(-1). The linear variation of D_e for the NX species (X = F, Cl, Br) supports a prediction of about 35 kcal/mol for the dissociation energy of NI.
机译:利用相关波函数和相关一致的轨道基础建立了NBr基态X〜3∑〜-的光谱常数和解离能,其质量达到了ξ的五倍。我们对平衡分离(r_e)的最佳估计是1.780 A,对于离解能(D_e)的最佳估计是49.5 kcal / mol,这表明从间接实验测量中获得的先前估计误差高达15 kcal / mol。在RCCSD(T)/ aug-cc-pV5Z理论水平上计算出的光谱常数为ω_e= 694.5 cm〜(-1),ω_eX_e= 4.14 cm〜(-1)和α_e= 0.0039 cm〜(-1) 。 NX物种(X = F,Cl,Br)的D_e线性变化支持NI的解离能约为35 kcal / mol的预测。

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