  We explore the possibility of existence of plasmonically generated electronic
Floquet bands at metal surfaces by studying the gauge transformed
electron-surface plasmon interaction in the prepumped plasmonic coherent state
environment. These bands may promote non-Einsteinian electron emission from
metal surfaces exposed to primary interactions with strong electromagnetic
fields. Resonant behaviour and scaling of emission yield with the parent
electronic structure and plasmonic state parameters are estimated for Ag(111)
surface. Relative yield intensities from non-Einsteinian emission channels in
photoelectron spectra offer the means to calibrate the mediating plasmonic
fields and therefrom ensuing surface Floquet bands.
