Open AccessTowards non-sequential double ionization of Ne and Ar using a femtosecond laser oscillator
Author(s) -
Yunquan Liu,
S. Tschuch,
M. Dürr,
Artem Rudenko,
R. Moshammer,
J. Ullrich,
M. Siegel,
Uwe Morgner
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.018103
Subject(s) - ionization , double ionization , neon , atomic physics , femtosecond , laser , momentum (technical analysis) , atmospheric pressure laser ionization , materials science , ion , electron , physics , argon , optics , electron ionization , nuclear physics , finance , quantum mechanics , economics
We report on first proof-of-principles results on non-sequential double ionization of argon and neon achieved by using a newly developed long-cavity Ti:sapphire femtosecond oscillator with a pulse duration of 45 fs and a repetition of 6.2 MHz combined with a dedicated reaction microscope. Under optimized experimental conditions, peak intensities larger than 2.310(14) W/cm(2) have been achieved. Ion momentum distributions were recorded for both rare gases and show significantly different features for single as well as for double ionization. For single ionization of neon a spike of zero-momentum electrons is found when decreasing the laser intensity towards the lowest ionization rate we can measure which is attributed to a non-resonant ionization channel. As to double ionization, the longitudinal momentum distribution for Ne(2+) displays a clear double-hump structure whereas this feature is found to be smoothened out with a maximum at zero momentum for Ar(2+).