Results of electron-stimulated desorption of positive ions measured by the time-of-flight method from thin NaCl layers deposited onto Si(111) crystal are presented. The kinetic-energy distribution of Na þ is characterized by at least a double-peak structure suggesting desorption by the wave packet squeezing process, proposed recently for Li þ desorption from LiF. Moreover, a delayed Na þ signal is observed, indicating desorption of core-excited Na ** atoms being in metastable autoionizing states.