Spectrally resolved multi-channel contributions to the harmonic emission in N2

被引：28

作者：

Diveki, Z. ^{[1
]}

Camper, A. ^{[1
]}

Haessler, S. ^{[1
]}

Auguste, T. ^{[1
]}

Ruchon, T. ^{[1
]}

Carre, B. ^{[1
]}

Salieres, P. ^{[1
]}

Guichard, R. ^{[2
,3
]}

Caillat, J. ^{[2
,3
]}

Maquet, A. ^{[2
,3
]}

Taieb, R. ^{[2
,3
]}

机构：

[1] CEA Saclay, IRAMIS, Serv Photons Atomes & Mol, F-91191 Gif Sur Yvette, France

[2] UPMC Univ Paris 6, Lab Chim Phys Mat & Rayonnement, UMR 7614, F-75231 Paris 05, France

[3] CNRS, LCPMR, UMR 7614, Paris, France

来源：

NEW JOURNAL OF PHYSICS | 2012年 / 14卷

基金：

欧盟第七框架计划;

关键词：

DYNAMICS; GENERATION; SPECTROSCOPY; MOLECULES;

D O I：

10.1088/1367-2630/14/2/023062

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

When generated in molecules, high-order harmonics can be emitted through different ionization channels. The coherent and ultrafast electron dynamics occurring in the ion during the generation process is directly imprinted in the harmonic signal, i.e. in its amplitude and spectral phase. In aligned N-2 molecules, we find evidence for a fast variation of this phase as a function of the harmonic order when varying the driving laser intensity. Basing our analysis on a three-step model, we find that this phase variation is a signature of transitions from a single-to a multi-channel regime. In particular, we show that significant nuclear dynamics may occur in the ionization channels on the attosecond timescale, affecting both the amplitude and the phase of the harmonic signal.

引用

页数：11

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