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In this paper, we consider the perturbed Stark operator \begin{equation*}  Hu=H_0u+qu=-u^{\prime\prime}-xu+qu, \end{equation*} where $q$ is thepower-decaying perturbation. The criteria for $q$ such that $H=H_0+q$ has atmost one eigenvalue (finitely many, infinitely many eigenvalues) are obtained.  All the results are quantitative and are generalized to the perturbed Starktype operator.

Criteria for eigenvalues embedded into the absolutely continuous spectrum of perturbed Stark type operators