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Multiphoton ionization of sodium by laser pulses of 800 nm wavelength and 57fs duration is studied in the range of laser peak intensities belonging toover-the-barrier ionization regime. Photoelectron momentum distributions (PMD)and the energy spectra are determined numerically by solving the time dependentSchr\"odinger equation. The calculated spectra agree well with the spectraobtained experimentally by Hart et al. [Phys. Rev. A 93, 063426 (2016)]. Thecontributions of photoelectrons with different values of the orbital quantumnumber in the PMD are determined by expanding the photoelectron wave functionin terms of partial waves. Partial wave analysis of the spectral peaks relatedto Freeman resonances has shown that each peak has photoelectron contributionsfrom different ionization channels which are characterized by differentphotoelectron energies and different symmetries of released photoelectronwave-packets. These findings are justified by calculating the populations ofexcited states during the pulse. Our analysis indicates that the contributionof specific ionization channels in the total photoelectron yield might beselectively increased by varying to some extent the values of pulse parametersused here.

Partial-wave analysis of multiphoton ionization of sodium by femtosecond laser pulses of 800 nm wavelength in over-the-barrier ionization regime