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Beams of helium atoms in Rydberg-Stark states with principal quantum number$n=48$ and electric dipole moments of 4600~D have been decelerated from a meaninitial longitudinal speed of 2000~m/s to zero velocity in the laboratory-fixedframe-of-reference in the continuously moving electric traps of atransmission-line decelerator. In this process accelerations up to$-1.3\times10^{7}$~m/s$^2$ were applied, and changes in kinetic energy of$\Delta E_{\mathrm{kin}}=1.3\times10^{-20}$~J ($\Delta E_{\mathrm{kin}}/e =83$~meV) per atom were achieved. Guided and decelerated atoms, and thoseconfined in stationary electrostatic traps, were detected in situ by pulsedelectric field ionisation. The results of numerical calculations of particletrajectories within the decelerator have been used to characterise the observeddeceleration efficiencies, and aid in the interpretation of the experimentaldata.

Electrostatic trapping and in situ detection of Rydberg atoms above chip-based transmission lines