Physics and Astronomy Colloquium
Attomicroscope: The Fastest Microscope for Seeing Electrons in Action
4:00 pm –
5:00 pm
Theodore Jorgensen Hall
Room: 136
855 N 16th St
Lincoln NE 68588
Lincoln NE 68588
Additional Info: JH
Virtual Location:
Zoom Meeting
Target Audiences:
Contact:
Physics Department, (402) 472-2770, paoffice2@unl.edu
Dr. Mohammed Hassan will present his topic, “Attomicroscope: The Fastest Microscope for Seeing Electrons in Action,” via Zoom.
Ultrafast Electron Diffraction and Microscopy imaging have been demonstrated to be pivot tools for imaging the atomic motion in real-time and space 1-3. The generation of a few hundred femtoseconds electron pulses enabled recording movies for molecular and atomic motion4. However, the technical challenges in electron pulse compression have limited the temporal resolution of electron imaging experiments to a hundred femtoseconds. Here, we demonstrate the attosecond temporal resolution in the transmission electron microscope by optical gating 5 to establish what we so-called “attomicroscope” 6. Moreover, we utilized the attomicroscope to image the electron motion dynamics in graphene. In a strong field, the electron is moving in the reciprocal space following the waveform of the driver field. The attosecond electron diffraction experiment allowed us to study the electron density distribution in the reciprocal space at different time instants and connect it with the electron motion in real space. The demonstrated attomicroscopy imaging tool opens the avenue to study electron motion in neutral matter and promises new electron imaging applications in physics, chemistry, and biochemistry 6.
1] Hassan, M. T. J. Phys. B: At. Mol. Opt. Phys. 51, 032005, (2018).
[2] Miller, R. J. D. Science 343, 1108-1116, (2014).
[3] Zewail, A. H. Science 328, 187-193, (2010).
[4] Yang, J. et al. Science 368, 885-889, (2020).
[5] Hassan, M. T., Baskin, J. S., LiaoB & Zewail, A. H. Nat. Photon. 11, 425-430, (2017).
[6] Dandan Hui et al. ,Attosecond electron microscopy and diffraction.Sci. Adv.10,eadp5805(2024).
Ultrafast Electron Diffraction and Microscopy imaging have been demonstrated to be pivot tools for imaging the atomic motion in real-time and space 1-3. The generation of a few hundred femtoseconds electron pulses enabled recording movies for molecular and atomic motion4. However, the technical challenges in electron pulse compression have limited the temporal resolution of electron imaging experiments to a hundred femtoseconds. Here, we demonstrate the attosecond temporal resolution in the transmission electron microscope by optical gating 5 to establish what we so-called “attomicroscope” 6. Moreover, we utilized the attomicroscope to image the electron motion dynamics in graphene. In a strong field, the electron is moving in the reciprocal space following the waveform of the driver field. The attosecond electron diffraction experiment allowed us to study the electron density distribution in the reciprocal space at different time instants and connect it with the electron motion in real space. The demonstrated attomicroscopy imaging tool opens the avenue to study electron motion in neutral matter and promises new electron imaging applications in physics, chemistry, and biochemistry 6.
1] Hassan, M. T. J. Phys. B: At. Mol. Opt. Phys. 51, 032005, (2018).
[2] Miller, R. J. D. Science 343, 1108-1116, (2014).
[3] Zewail, A. H. Science 328, 187-193, (2010).
[4] Yang, J. et al. Science 368, 885-889, (2020).
[5] Hassan, M. T., Baskin, J. S., LiaoB & Zewail, A. H. Nat. Photon. 11, 425-430, (2017).
[6] Dandan Hui et al. ,Attosecond electron microscopy and diffraction.Sci. Adv.10,eadp5805(2024).
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