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In recent experiments [1,2], Rydberg atoms have been exposed to ultrashort, electric-field pulses. The electric field in these pulses is nearly unipolar, and has a temporal shape which resembles one-half of a cycle of THz-band radiation [3]. In the experiments [1,2], the 0.5-psec dura tion of these "half-cycle pulses" (HCPs), 1"HCP' is shorter than or comparable to the classical Kepler period of the Rydberg states, 1"K =21Tn 3. The dynamics of the ioniza tion process in these experiments is distinctly different from that in either a long field pulse ('Tpulse> 'TK) [4] or a short laser pulse (1"laser < 1"K ) [5]. In a long electric-field pulse, essentially no energy is transferred to the Rydberg electron. Instead, ionization occurs due to the modification of the electronic binding potential [4]. In a HCP, the electron is unable to respond to the rapid changes in the binding potential, and the electron must gain energy from the field in order to es cape the Coulomb attraction of the nucleus. Classically speaking, the electron receives an energy "kick" or im pulse from the rapidly changing field [1],

Effects of imperfect unipolarity on the ionization of Rydberg atoms by subpicosecond half-cycle pulses