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

页码：L299 / L304

页数：6

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