An unpublished absorption band of the fluorosulphate radical, FSO3, based on earlier experiments of Schumacher and co-workers (Z. Phys. Chem. NF 42 (1964) 174) and detailed calculations of the whole FSO3 spectra based on the time-dependent (TD) generalization of the density functional theory (DFT), TD-DFT, are reported. Part of this band, that increases in intensity at wavelengths below 275 nm, has been extracted from an absorption spectrum taken from equilibrated mixtures of FSO3 with the dimer FS(O2)OO(O2)SF at 403 K. A set of thirteen exchange-correlation hybrid functionals combined with the 6-311+G(3df) basis set predict an intense absorption band centred at 256 ± 10nm in very good agreement with the experimental observations. Another significant band peaked at 184 ± 10nm was also found. The calculations reproduce accurately the position of the maximum and the experimental oscillator strength of the well-known visible FSO3 band system.
报道了一种未发表的氟硫酸盐自由基FSO3的吸收带,该吸收带基于Schumacher和同事早期的实验(Z. Phys. Chem. NF 42(1964)174)和基于时间相关(TD)密度泛函理论(DFT)的整个FSO3光谱的详细计算,即TD-DFT。这个吸收带的一部分,在小于275 nm的波长处增强,已从与双聚物FS(O2)OO(O2)SF在403 K下平衡混合物的吸收光谱中提取出来。结合6-311+G(3df)基组的13个交换相关杂化泛函预测在256±10nm处有一个强烈的吸收带,与实验观察非常吻合。另一个显著的峰值在184±10nm处。计算准确地再现了已知可见FSO3带系的最大位置和实验振子强度。