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Motivated by the prospect of an optical frequency standard based on 43Ca+, wecalculate the blackbody radiation (BBR) shift of the 4s_1/2-3d_5/2 clocktransition, which is a major component of the uncertainty budget. Thecalculations are based on the relativistic all-order single-double method whereall single and double excitations of the Dirac-Fock wave function are includedto all orders of perturbation theory. Additional calculations are conducted forthe dominant contributions in order to evaluate some omitted high-ordercorrections and estimate the uncertainties of the final results. The BBR shiftobtained for this transition is 0.38(1) Hz. The tensor polarizability of the3d_5/2 level is also calculated and its uncertainty is evaluated as well. Ourresults are compared with other calculations.

Blackbody radiation shift in a 43Ca+ ion optical frequency standard