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Relativistic coupled cluster theory is used to determine accurate electric field gradients in order to provide a theoretical value for the nuclear quadrupole moment of 139 La. Here we used the diatomic lanthanum monohalides LaF, LaCl, LaBr, and LaI as accurate nuclear quadrupole coupling constants are available from rotational spectroscopy by Rubinoff et al. ͓J. Mol. Spectrosc. 218, 169 ͑2003͔͒. The resulting nuclear quadrupole moment for 139 La ͑0.200± 0.006 barn͒ is in excellent agreementdoi:10.1063/1.2787000 pmid:18052423 fatcat:lqraac5n7rcetfo2frcfu63ium