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用吸收光谱实验数据和ｄ轨道理论确定了Ｖ￣２＋：ＮａＣｌ和Ｖ￣２＋：ＮａＢｒ中的Ｖ￣２＋－Ｃｌ－（Ｂｒ￣－）键长，结果表明：ＮａＣｌ和ＮａＢｒ中的Ｖ￣２＋－Ｃｌ￣－（Ｂｒ￣－）键长明显小于未掺杂晶格中的Ｎａ￣＋－Ｃｌ￣－（Ｂｒ￣－）离子距离．本文所用的方法不失为一种简单可靠的有效方法。
The bond lengths of V ~ 2 + -Cl- (Br ~ -) in V ~ 2 +: NaCl and V ~ 2 +: NaBr were determined by absorption spectra and d orbital theory. The results showed that the V ~ 2 + The Cl ~ (Br ~ -) bond length is significantly smaller than the Na ~ + -Cl ~ (Br ~ -) ion distance in the undoped lattice. The method used in this paper can be regarded as a simple and reliable and effective method.