title: Spectral dips in ion emission emerging from ultrashort laser-driven plasmas.
abstract: Deep dips in MeV ion spectra are obtained from water droplet targets irradiated by intense [(0.5-1.2) x 10(19) W/cm(2)] and ultrashort (35 fs) laser pulses. The existence of these dips is ascribed to the generation of a multielectron-temperature plasma, which is confirmed by our experiments. An existing fluid model based on hot-electron components with significantly different temperatures is consistent with the behavior we observe in the ion spectra of the femtosecond laser-driven interaction. The model provides a good simulation of the observed spectral dips and allows us to establish important parameters such as hot- and cold-electron temperatures and the respective electron density ratios. The result may be of interest for spectral tailoring of proton spectra in future applications of laser-generated proton beams.
authors.affiliation: Max-Born-Institut, Max-Born-Strasse 2a, D-12489 Berlin, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Ter-Avetisyan
authors.forename: M
authors.initials: M
authors.lastname: Schnürer
authors.forename: S
authors.initials: S
authors.lastname: Busch
authors.forename: E
authors.initials: E
authors.lastname: Risse
authors.forename: P V
authors.initials: PV
authors.lastname: Nickles
authors.forename: W
authors.initials: W
authors.lastname: Sandner