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Pronounced maximum absorption of laser light irradiating a rare-gas or metalcluster is widely expected during the linear resonance (LR) when Mie-plasmawavelength $\lambdaM$ of electrons equals the laser wavelength $\lambda$. Onthe contrary, by performing molecular dynamics (MD) simulations of an argoncluster irradiated by short 5-fs (fwhm) laser pulses it is revealed that, for agiven laser pulse energy and a cluster, at each peak intensity there exists a$\lambda$ -- shifted from the expected $\lambdaM$ -- that corresponds to a {\emunified dynamical} LR at which evolution of the cluster happens through veryeffective unification of possible resonances in various stages, including (i)the LR in the initial time of plasma creation, (ii) the LR in the Coulombexpanding phase in the later time and (iii) anharmonic resonance in themarginally over-dense regime for a relatively longer pulse duration, leading tomaximum laser absorption accompanied by maximum removal of electrons fromcluster and also maximum allowed average charge states for the argon cluster.Increasing the laser intensity, the absorption maxima is found to shift to ahigher wavelength in the band of $\lambda\approx (1-1.5)\lambdaM$ thanpermanently staying at the expected $\lambdaM$. A naive rigid sphere model alsocorroborates the wavelength shift of the absorption peak as found in MD andun-equivocally proves that maximum laser absorption in a cluster happens at ashifted $\lambda$ in the marginally over-dense regime of $\lambda\approx(1-1.5)\lambdaM$ in stead of $\lambdaM$ of LR. Present study may findimportance for guiding an optimal condition laser-cluster interactionexperiment in the short pulse regime.

Dynamical resonance shift and unification of resonances in short-pulse laser cluster interaction