Maomao Gong

Shaanxi Normal University

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Xiangjun Chen

Binzhou University

Shengpeng Zhou

Jilin University

Xu Shan

University of Science and Technology of China

Qiguo Tian

Tianjin University

Jing Yang

University of New Mexico

Jiaqi Zhou

Xi'an Jiaotong University

Jianguo Wang

China University of Mining and Technology

Zheng Shu

Vanderbilt University

Zhenpeng Wang

Institute of Applied Physics and Computational Mathematics

Pan Ma

Changsha University of Science and Technology

Cooperative Institutions

Jilin University

University of Science and Technology of China

Hefei National Center for Physical Sciences at Nanoscale

Jilin Medical University

CAS Key Laboratory of Urban Pollutant Conversion

Chinese Academy of Sciences

Institute of Applied Physics and Computational Mathematics

Anhui Xinhua University

Xi'an Jiaotong University

Max Planck Institute for Nuclear Physics

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Time-Dependent Density-Matrix Theory II. Mass Dispersion in Damped Nuclear Reactions

Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy (1989)

Maomao Gong M. Tohyama J. Randrup

Matrix (chemical analysis)

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Directly imaging excited state-resolved transient structures of water induced by valence and inner-shell ionisation

Nature Communications (2023)

Zhenzhen Wang Xiaoqing Hu Xiaorui Xue Shengpeng Zhou Xiaokai Li

Real-time imaging of transient structure of the electronic excited state is fundamentally critical to understand and control ultrafast molecular dynamics. The ejection of electrons from the inner-shell and valence level can lead to the population of different excited states, which trigger manifold ultrafast relaxation processes, however, the accurate imaging of such electronic state-dependent structural evolutions is still lacking. Here, by developing the laser-induced electron recollision-assisted Coulomb explosion imaging approach and molecular dynamics simulations, snapshots of the vibrational wave-packets of the excited (A) and ground states (X) of D2O+ are captured simultaneously with sub-10 picometre and few-femtosecond precision. We visualise that θDOD and ROD are significantly increased by around 50∘ and 10 pm, respectively, within approximately 8 fs after initial ionisation for the A state, and the ROD further extends 9 pm within 2 fs along the ground state of the dication in the present condition. Moreover, the ROD can stretch more than 50 pm within 5 fs along autoionisation state of dication. The accuracies of the results are limited by the simulations. These results provide comprehensive structural information for studying the fascinating molecular dynamics of water, and pave the way towards to make a movie of excited state-resolved ultrafast molecular dynamics and light-induced chemical reaction.

Dication

Valence electron

10.1038/s41467-023-41204-x

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Imaging molecular geometry with electron momentum spectroscopy

Scientific Reports (2016)

Enliang Wang Xu Shan Qiguo Tian Jing Yang Maomao Gong

Abstract Electron momentum spectroscopy is a unique tool for imaging orbital-specific electron density of molecule in momentum space. However, the molecular geometry information is usually veiled due to the single-centered character of momentum space wavefunction of molecular orbital (MO). Here we demonstrate the retrieval of interatomic distances from the multicenter interference effect revealed in the ratios of electron momentum profiles between two MOs with symmetric and anti-symmetric characters. A very sensitive dependence of the oscillation period on interatomic distance is observed, which is used to determine F-F distance in CF 4 and O-O distance in CO 2 with sub-Ångström precision. Thus, using one spectrometer, and in one measurement, the electron density distributions of MOs and the molecular geometry information can be obtained simultaneously. Our approach provides a new robust tool for imaging molecules with high precision and has potential to apply to ultrafast imaging of molecular dynamics if combined with ultrashort electron pulses in the future.

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Oscillation (cell signaling)

10.1038/srep39351

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