## Rescaled and shifted energy distribution ρ(*z*) of the reflected particle for the same parameters as in the previous figure

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**Figure 3.** Rescaled and shifted energy distribution ρ(*z*) of the reflected particle for the same parameters as in the previous figure. The distribution is computed from the momentum distribution for positive momenta *k* only (see figure 2). For each value of ω, the peaks occur at integer values of z=n \in \mathbb {N}, cf equation (7).

**Abstract**

We describe an experimentally realistic situation of the quantum reflection of helium atoms from an oscillating surface. The temporal modulation of the potential induces clear sidebands in the reflection probability as a function of momentum. These sidebands could be exploited to slow down atoms and molecules in the experiment.