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Observation of Vibrational Wavepacket Evolution of H2+ by Time-Resolved Spectroscopy of HHG Pulses

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Abstract

High-order harmonic generation (HHG) of a strong laser field can provide a coherent short pulse of an extreme-ultraviolet (XUV) region. By using such a short XUV pulse, one can perform a time-resolved spectroscopy of tracing the ultrafast dynamics at a highly excited state including ion states. The molecular hydrogen ion H2+ is a suitable system to demonstrate experimentally to trace a temporal evolution of wavepacket [1-3]. In the previous reports, either the Coulomb explosion of H22+ or the dissociation through the first electronic excited state 2pσu of H2+ had been selected to the probe scheme for observation of the vibrational wavepacket (VWP) evolution. When the H2+ in the 1sσg sate will be excited to the second electronic excited state 2pσu, the photoexcitation energy of 10 eV or higher is required. In the present work, we investigated the VWP dynamics of H2+ by the XUV pump and probe time-resolved spectroscopy using short HHG pulses. We observed the time-dependent internuclear distance of H2+ in the 1sσg state by using the multicolor probe pulse, which is one of the unique features of HHG pulse.

© 2014 Japan Society of Applied Physics, Optical Society of America

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