Based on the improved multiparameter exponential‐type potential (IMPET), an extended IMPET (EIMPET) potential has been suggested to reduce the discrepancy between the calculated and experimental values, improving the accuracy near the equilibrium and in the asymptotic region. The average fitting deviation δav and Root‐Mean‐Square (RMS) error is used to evaluate the performance of the potential which generates potential energy curves (PECs) and vibrational energy levels for ClF‐A(3Π1), CP‐X2Σ+, ICl‐X1Σ+, IBr‐X1Σ+, CO‐X1Σ+, and 6Li2‐X1Σ+ molecules that agree better with the Rydberg‐Klein‐Rees (RKR) data than Morse, Huxley‐Murrell (HM) and IMPET potentials. This work provides a reference for the construction and improvement of potential energy functions for diatomic molecules.

中文翻译：

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双原子分子的扩展改进多参数指数型势能函数

基于改进的多参数指数型势（IMPET），提出了扩展IMPET（EIMPET）势，以减少计算值与实验值之间的差异，提高平衡附近和渐近区​​域的精度。平均拟合偏差δ影音均方根 (RMS) 误差用于评估生成势能曲线 (PEC) 和 ClF-A 振动能级的势能性能（3Π1), CP-X2Σ+, ICl-X1Σ+, IBr-X1Σ+,CO-X1Σ+， 和6李2-X1Σ+与 Morse、Huxley-Murrell (HM) 和 IMPET 电势相比，这些分子与 Rydberg-Klein-Rees (RKR) 数据更加一致。该工作为双原子分子势能函数的构建和改进提供了参考。