Ultrafast Relaxation Dynamics of Highly-excited States in N2Molecules Excited by Femtosecond XUV Pulses

Matteo Lucchini,Wing Kiu Siu,Mauro Nisoli,Majdi Hochlaf,Francesca Calegari,Kyung Seung Kim,Marc J.J Vrakking,Freek Kelkensberg,Giuseppe Sansone

doi:10.1051/epjconf/20134102004

Abstract

We used velocity-map-imaging to measure electronic and nuclear dynamics in N2 molecules excited by a train of attosecond pulses. A time-to-space mapping of autoionization channel is demonstrated. It is found that the autoionization becomes energetically allowed when the two nuclei are still very close (~ 3 A) and that it can be coherently manipulated by a strong femtosecond infrared pulse.

Highlights

The dynamics of photo-ionization processes in atoms and molecules plays an important role in a number of fundamental physical and chemical phenomena [1]
The bandwidth of the XUV radiation extends beyond the ionization threshold of N2 at 15.58 eV, as shown in Fig. 1, up to ∼ 55 eV, so that the XUV photons can promote the molecular ion N2+ to a
We used a 15-fs IR pulse to probe the molecular dissociation dynamics driven by attosecond pulse trains (APTs)

Summary

Introduction

The dynamics of photo-ionization processes in atoms and molecules plays an important role in a number of fundamental physical and chemical phenomena [1]. We used velocity-map-imaging to measure electronic and nuclear dynamics in N2 molecules excited by a train of attosecond pulses.

Results

Conclusion