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The possibility of a significant slowdown of particles by removing them froma localized state in an electromagnetic potential well with a fixed spatialdistribution is shown with a sufficiently slow decrease in the depth of thiswell with time. It is believed that the considered particles are in high vacuumconditions and forces acting on them are not dissipative, i.e. these particlesmove without friction. Depending on whether the particles have an electric(magnetic) dipole moment, a controlled electric (magnetic) field or nonresonantlaser radiation can be used to slow them down in this way. A detailed analysisof the features and efficiency of the established particle decelerationmechanism was carried out on the example of the one-dimensional rectangularpotential well based on simple mathematical relationships. The obtained resultscan be used in the mechanics of micro- and nanoparticles in high vacuum, andunder certain conditions also in ultra-high resolution spectroscopy of atomsand molecules "cooled" by the proposed method.

On slowdown of particles in a vacuum at their delocalization from an electromagnetic well with a depth decreasing with time