Level-1 Rates for Triggers Using the ETMISS Signature

In the ATLAS experiment the ETMISS trigger will be used in conjunction with other triggers like the single jet, the single electron and the tau trigger. In the present note rates for various combi nations of such triggers are estimated for both low and high luminosities. These rates are dominated by background events from QCD two jet production. In comparison to these background rates, als o the rates from processes with genuine missing transverse energy, like W- and top-production and the production of supersymmetric particles are given.