[ adjective ] relying to some extent on observation or experiment

Used in print

(James A. Ibers et al., "Proton magnetic resonance...)

A number of semiempirical estimates by various workers lead to the conclusion that the **f bond becomes symmetric when the **f bond length is about 2.4 to 2.5 A , but aside from the possible example of nickel dimethylglyoxime there have been no convincing reports of symmetric **f bonds .

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