%0 Journal Article %T M¨¦thode des orbites et formules du caract¨¨re pour les repr¨¦sentations temp¨¦r¨¦es d'un groupe alg¨¦brique r¨¦el r¨¦ductif non connexe %A Jean-Yves Ducloux %J Mathematics %D 2000 %I arXiv %X Let G be a non-connected reductive real Lie group. In this paper, I parametrize the set of irreductible tempered characters of G. Afterwards, I describe these characters by means of some ``Kirillov's formulas'', using the descent method near each elliptic element in G. If G is linear and connected, the parameters that I use are ``final basic'' parameters in the sense of Knapp and Zuckerman. %U http://arxiv.org/abs/math/0010034v1