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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.


Numerically simulated snapshot of the electron spatial distribution of the EWP between the A2Πu state and the  state.(A) Nuclear correlation function . (B) Nuclear correlation function integrated over the internuclear distance . (C) Snapshots of differential electron density between the A2Πu and  states in N2+, where the green circles indicate the positions of nitrogen atoms with an equilibrium geometry of N2.
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Figure 4: Numerically simulated snapshot of the electron spatial distribution of the EWP between the A2Πu state and the state.(A) Nuclear correlation function . (B) Nuclear correlation function integrated over the internuclear distance . (C) Snapshots of differential electron density between the A2Πu and states in N2+, where the green circles indicate the positions of nitrogen atoms with an equilibrium geometry of N2.

Mentions: Figure 4A shows the numerically simulated temporal evolution of the nuclear correlation function between the A2Πu and states, . In the figure, the EWP between the electronic states oscillates with a period of 500 as. Figure 4B shows the correlation function integrated over the internuclear distance and the charge oscillation between two electronic states.


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)

Numerically simulated snapshot of the electron spatial distribution of the EWP between the A2Πu state and the  state.(A) Nuclear correlation function . (B) Nuclear correlation function integrated over the internuclear distance . (C) Snapshots of differential electron density between the A2Πu and  states in N2+, where the green circles indicate the positions of nitrogen atoms with an equilibrium geometry of N2.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 4: Numerically simulated snapshot of the electron spatial distribution of the EWP between the A2Πu state and the state.(A) Nuclear correlation function . (B) Nuclear correlation function integrated over the internuclear distance . (C) Snapshots of differential electron density between the A2Πu and states in N2+, where the green circles indicate the positions of nitrogen atoms with an equilibrium geometry of N2.
Mentions: Figure 4A shows the numerically simulated temporal evolution of the nuclear correlation function between the A2Πu and states, . In the figure, the EWP between the electronic states oscillates with a period of 500 as. Figure 4B shows the correlation function integrated over the internuclear distance and the charge oscillation between two electronic states.

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.