Laser-microwave spectroscopy of Ag I atoms in F Rydberg state

For the first time the energy level positions of Ag I atoms have been measured with high accuracy by means of laser-microwave spectroscopy in the 149-289 GHz frequency range. The new measurements cover the range of principal quantum number n=28-38 for Rydberg series F
_5/2,7/2
. Using our measured frequencies the quantum defect constants for this series are obtained. The description of our spectrometer, measurement technique and results are presented.