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Istituto Nazionale di Fisica della Materia e Dipartimento di Fisica, Universita`di Pisa, Piazza Torricelli 2, 56126 Pisa, Italy~Received 20 October 1997!The yields and time-of-ight spectra for ions produced in three-photon ionization of atomic deuterium havebeen investigated as a function of laser intensity from 0.4 to 200 MW/cm

Observation of collective effects in the multiphoton ionization of atomic deuterium