On the modification of the Stark states of hydrogen by a weak ac electric field Viorica Florescu, and Suzana Patrascu Citation: Journal of Mathematical Physics 31, 2165 (1990); doi: 10.1063/1.528619 View online: http://dx.doi.org/10.1063/1.528619 View Table of Contents: http://aip.scitation.org/toc/jmp/31/9 Published by the American Institute of Physics