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Effects of weak electric fields on resonant energy transfer between NH$_3$ inthe X $^1$A$_1$ ground electronic state, and Rydberg He atoms in triplet stateswith principal quantum numbers $n = 36$-$41$ have been studied in a crossedbeam apparatus. For these values of $n$, electric-dipole transitions betweenthe Rydberg states that evolve adiabatically to the $|ns\rangle$ and$|np\rangle$ states in zero electric field can be tuned into resonance with theground-state inversion transitions in NH$_3$ using electric fields, with energytransfer occurring via F\"orster resonance. In the experiments the Rydberg Heatoms, traveling in pulsed supersonic beams, were prepared by resonanttwo-photon excitation from the metastable $1s2s\,^3S_1$ level and crossed aneffusive beam of NH$_3$ before being detected by state-selectivepulsed-electric-field ionization. The resonant-energy-transfer process wasidentified by monitoring changes in the ionization signal from the $|ns\rangle$and $|np\rangle$ Rydberg states for each value of $n$. The electric fielddependence of the experimental data is in good agreement with the results ofcalculations in which the resonant dipole-dipole coupling between the collisionpartners was accounted for.

Electrically tuned F\"orster resonances in collisions of NH$_3$ with Rydberg He atoms