Meşe, EminePotvliege, R. M.2024-04-242024-04-242007Meşe, E. ve Potvliege, R. M.. (2007). The quasienergy spectrum of argon from 400 to 800 nm. Laser Physics Letters, 4(5), 357-362.1612-20111612-202Xhttps://doi.org/10.1002/lapl.200610130https://hdl.handle.net/11468/14084https://iopscience.iop.org/article/10.1002/lapl.200610130The Floquet quasienergy spectrum of argon atoms exposed to a strong laser field is presented for incident wavelengths of 400, 600, and 800 nm and electron excursion amplitudes up to 30 a.u. The calculation is performed by diagonalizing the Floquet Hamiltonian on a discrete basis of Sturmian functions, the atom being described by a one-electron model potential. How the quasienergies of the dressed bound states change as functions of both the wavelength and the intensity of the incident field is studied. The spectrum of the dressed excited states varies slowly with these two parameters, apart for a number of changes between direct and avoided crossings and for less frequent, more profound reorganizations. The spectrum converges at high intensity towards that predicted by the high-frequency Floquet theory.eninfo:eu-repo/semantics/closedAccessQuasienergyMultiphoton processesLight-Induced degeneracyArticle45357362WOS:0002465680000062-s2.0-3454825137710.1002/lapl.200610130Q2Q1