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and allowing for the correlations between bond lengths, the e.s.d's of the mean bond lengths are 0.0028 A for naphthalene and 0.0021 /~ for anthracene. The difference of the means is possibly significant for naphthalene, but, even if the theoretical mean is readjusted, it is still necessary to postulate theoretical errors for this molecule up to about 0.020 A to obtain satisfactory agreement between theory and experiment.
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Cruickshank et al. (1953) studied this question.
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