Here, we consider nuclear excitation by electron capture (NEEC) in a beam-based experiment for the

{}^{84 m}{Rb}

isomer (

I^{π}

6^{-}, T_{1 / 2} = 20.26

min). The NEEC process for the

{}^{84 m}{Rb}

isomer allows an excitation by magnetic-dipole (

M 1

) and electric-quadrupole (

E 2

) transitions into a depletion level (

I^{π}

5^{-}

), which subsequently decays, releasing a substantial amount of stored energy. To ensure effective production of the

{}^{84 m}{Rb}

isomer, the fusion-evaporation reaction

{}^{82}{Se} + {}^{7}{Li}

is considered. In the multiconfigurational Dirac-Fock calculations of energy released by electron capture into the

M, N, O, P

, and

Q

shells, we have used the ground-state configurations for

{}^{84 m}{Rb}

ions. To focus on the role of

M 1

and

E 2

transition multipolarities, Compton profiles, and excited-state configurations are neglected here. The predictions of the mean equilibrium charge state for the

{}^{84 m}{Rb}

recoil ion as a function of its kinetic energy in the C target and the analysis of potentially possible NEEC resonance kinetic energies have been performed. The NEEC resonance strengths and probabilities have been estimated by a theoretical model applied for the

M 1

and

E 2

excitations. It was found that the

M 1

contribution for the NEEC process clearly dominates over the

E 2

one. Moreover, the total NEEC probability (

M 1

plus

E 2

) for

{}^{84 m}{Rb}

isomer is almost three orders of magnitude higher than that predicted for the

{}^{93 m}{Mo}

isomer. This result makes the

{}^{84 m}{Rb}

isomer a good candidate for new NEEC beam-based experiment.

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