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Direct observation of an attosecond electron wave packet in a nitrogen molecule.

Okino T, Furukawa Y, Nabekawa Y, Miyabe S, Amani Eilanlou A, Takahashi EJ, Yamanouchi K, Midorikawa K - Sci Adv (2015)

Bottom Line: Nonlinear Fourier transform spectroscopy using an attosecond-pump/attosecond-probe technique is used to observe an attosecond electron wave packet in a nitrogen molecule in real time.The 500-as electronic motion between two bound electronic states in a nitrogen molecule is captured by measuring the fragment ions with the same kinetic energy generated in sequential two-photon dissociative ionization processes.The temporal evolution of electronic coherence originating from various electronic states is visualized via the fragment ions appearing after irradiation of the probe pulse.

View Article: PubMed Central - PubMed

Affiliation: Attosecond Science Research Team, RIKEN Center for Advanced Photonics, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.

ABSTRACT
Capturing electron motion in a molecule is the basis of understanding or steering chemical reactions. Nonlinear Fourier transform spectroscopy using an attosecond-pump/attosecond-probe technique is used to observe an attosecond electron wave packet in a nitrogen molecule in real time. The 500-as electronic motion between two bound electronic states in a nitrogen molecule is captured by measuring the fragment ions with the same kinetic energy generated in sequential two-photon dissociative ionization processes. The temporal evolution of electronic coherence originating from various electronic states is visualized via the fragment ions appearing after irradiation of the probe pulse. This observation of an attosecond molecular electron wave packet is a critical step in understanding coupled nuclear and electron motion in polyatomic and biological molecules to explore attochemistry.

No MeSH data available.


Temporal evolution of VWPs for assigning EWP.(A) Delay-dependent KE distribution of N+. (B) Frequency-KE spectrogram of (A). (C) Probe scheme of the VWP prepared in the  state. (D) Probe scheme of the VWP prepared in the  state.
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Figure 3: Temporal evolution of VWPs for assigning EWP.(A) Delay-dependent KE distribution of N+. (B) Frequency-KE spectrogram of (A). (C) Probe scheme of the VWP prepared in the state. (D) Probe scheme of the VWP prepared in the state.

Mentions: We measured the delay-dependent KE distribution of N+ exhibiting the temporal evolution of VWPs as shown in Fig. 3A. Figure 3B shows the Fourier power spectrogram of Fig. 3A. The observed nuclear motion Tvib ~54 fs (~18.5 THz) is ascribed to the VWP motion in state in N2. As shown schematically in Fig. 3C, peaks B and C originate from N+ generated by the excitation with the 11th- and higher-order harmonics at the outer turning point to the state and dissociate into different dissociation limits (L4 for peak B and L3 for peak C).


Direct observation of an attosecond electron wave packet in a nitrogen molecule.

Okino T, Furukawa Y, Nabekawa Y, Miyabe S, Amani Eilanlou A, Takahashi EJ, Yamanouchi K, Midorikawa K - Sci Adv (2015)

Temporal evolution of VWPs for assigning EWP.(A) Delay-dependent KE distribution of N+. (B) Frequency-KE spectrogram of (A). (C) Probe scheme of the VWP prepared in the  state. (D) Probe scheme of the VWP prepared in the  state.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4643781&req=5

Figure 3: Temporal evolution of VWPs for assigning EWP.(A) Delay-dependent KE distribution of N+. (B) Frequency-KE spectrogram of (A). (C) Probe scheme of the VWP prepared in the state. (D) Probe scheme of the VWP prepared in the state.
Mentions: We measured the delay-dependent KE distribution of N+ exhibiting the temporal evolution of VWPs as shown in Fig. 3A. Figure 3B shows the Fourier power spectrogram of Fig. 3A. The observed nuclear motion Tvib ~54 fs (~18.5 THz) is ascribed to the VWP motion in state in N2. As shown schematically in Fig. 3C, peaks B and C originate from N+ generated by the excitation with the 11th- and higher-order harmonics at the outer turning point to the state and dissociate into different dissociation limits (L4 for peak B and L3 for peak C).

Bottom Line: Nonlinear Fourier transform spectroscopy using an attosecond-pump/attosecond-probe technique is used to observe an attosecond electron wave packet in a nitrogen molecule in real time.The 500-as electronic motion between two bound electronic states in a nitrogen molecule is captured by measuring the fragment ions with the same kinetic energy generated in sequential two-photon dissociative ionization processes.The temporal evolution of electronic coherence originating from various electronic states is visualized via the fragment ions appearing after irradiation of the probe pulse.

View Article: PubMed Central - PubMed

Affiliation: Attosecond Science Research Team, RIKEN Center for Advanced Photonics, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.

ABSTRACT
Capturing electron motion in a molecule is the basis of understanding or steering chemical reactions. Nonlinear Fourier transform spectroscopy using an attosecond-pump/attosecond-probe technique is used to observe an attosecond electron wave packet in a nitrogen molecule in real time. The 500-as electronic motion between two bound electronic states in a nitrogen molecule is captured by measuring the fragment ions with the same kinetic energy generated in sequential two-photon dissociative ionization processes. The temporal evolution of electronic coherence originating from various electronic states is visualized via the fragment ions appearing after irradiation of the probe pulse. This observation of an attosecond molecular electron wave packet is a critical step in understanding coupled nuclear and electron motion in polyatomic and biological molecules to explore attochemistry.

No MeSH data available.