Multi-photon ionization of molecular nitrogen by femtosecond soft x-ray FEL pulses

被引：49
|
作者：
Sorokin, A. A.
Bobashev, S. V.
Tiedtke, K.
Richter, M.
机构：
[1] Phys Tech Bundesanstalt, D-10587 Berlin, Germany
[2] AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia
[3] Deutsch Elektron Synchrotron, D-22603 Hamburg, Germany
来源：
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 2006年 / 39卷 / 14期
关键词：
D O I：
10.1088/0953-4075/39/14/L04
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
At the new free-electron laser (FEL) for vacuum ultraviolet (VUV) and soft x-ray radiation FLASH of the Deutsches Elektronen-Synchrotron (DESY) in Hamburg, multi-photon double ionization of molecular nitrogen has been observed and studied by ion time-of-flight spectroscopy. The experiments have been performed at the microfocus beamline BL2 with photon pulses of 25 fs duration and irradiance levels up to 2 x 10(13) W cm(-2) at a photon energy of 38 eV, i.e. well above the first ionization/dissociation thresholds of the target. A new and important aspect of our experiments has been the reliable determination of absolute photon numbers per pulse with the help of a calibrated setup allowing the investigation of nonlinear effects by quantitative measurements. Results obtained are discussed in terms of a sequential two-photon ionization scheme.
引用
收藏
页码：L299 / L304
页数：6
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