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We calculate the intersubband and intrasubband many-body inelastic Coulombscattering rates due to electron-electron interaction in two-subbandsemiconductor quantum wire structures. We analyze our relaxation rates in termsof contributions from inter- and intrasubband charge-density excitationsseparately. We show that the intersubband (intrasubband) charge-densityexcitations are primarily responsible for intersubband (intrasubband) inelasticscattering. We identify the contributions to the inelastic scattering ratecoming from the emission of the single-particle and the collective excitationsindividually. We obtain the lifetime of hot electrons injected in each subbandas a function of the total charge density in the wire.Comment: Submitted to PRB. 20 pages, Latex file, and 7 postscript files with  Figure

Intrasubband and intersubband electron relaxation in semiconductor quantum wire structures