title: Ramsey-type spectroscopy with high-order harmonics.
abstract: We present an experiment where Ramsey-type spectroscopy is applied to autoionizing states of krypton by using the ninth harmonic (88 nm) of a femtosecond Ti:sapphire laser. The ionization process, detected by an electron-energy spectrometer, shows the characteristic quantum interference pattern. The behavior of the fringe contrast compares favorably with a simple essential-state model, whose parameters have been taken from the literature. The experiment shows the feasibility of high-resolution spectroscopy in the extreme ultraviolet by using high-order laser harmonics.
authors.affiliation: Istituto Nazionale per la Fisica della Materia (INFM) Unità di Ricerca di Firenze, Via Sansone 1, I-50019 Sesto Fiorentino, Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Cavalieri
authors.forename: Roberto
authors.initials: R
authors.lastname: Eramo
authors.forename: Marzia
authors.initials: M
authors.lastname: Materazzi
authors.forename: Chiara
authors.initials: C
authors.lastname: Corsi
authors.forename: Marco
authors.initials: M
authors.lastname: Bellini