Time- and Frequency-Resolved Study on a Vibrational Wavepacket of H2 +/D2 + Using Intense Attosecond Pulse Trains

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  • NABEKAWA Yasuo
    Attosecond Science Research Team, RIKEN Center for Advanced Photonics
  • FURUKAWA Yusuke
    Attosecond Science Research Team, RIKEN Center for Advanced Photonics Department of Engineering Science, The University of Electro-Communication
  • OKINO Tomoya
    Attosecond Science Research Team, RIKEN Center for Advanced Photonics
  • YAMANOUCHI Kaoru
    Department of Chemistry, School of Science, The University of Tokyo
  • MIDORIKAWA Katsumi
    Attosecond Science Research Team, RIKEN Center for Advanced Photonics

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  • 高強度アト秒パルス列を用いた水素イオン振動波束の研究
  • コウキョウド アトビョウ パルスレツ オ モチイタ スイソ イオン シンドウハ ソク ノ ケンキュウ

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Abstract

We observed the ultrafast dynamic evolution of vibrational wave packets generated in the ground electronic state of a D2 +/H2 + ion using a pair of attosecond pulse trains (APTs), formed with the high- (7th-order and higher) and low- (5th-order and lower) order harmonic fields of a sub-15 fs Ti:sapphire laser pulse. The kinetic energy release spectrum of the fragment ions of D+/H+ exhibited a twodimensional spectrogram of the wave packet by scanning the delay between the two APTs in the pair. Due to the simplicity of the one-photon excitation for the fragmentation in the probe process, we developed a novel method by mimicking the frequency-resolved optical gating technique to retrieve the complex wave packet amplitudes at ionization. The retrieved amplitude exhibited a nontrivial phase modulation, which can be interpreted as a ~1 fs settling time of the vibrational wave packet at ionization.

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