Chin. Phys. Lett.  2022, Vol. 39 Issue (11): 113301    DOI: 10.1088/0256-307X/39/11/113301
ATOMIC AND MOLECULAR PHYSICS |
Measuring Charge Distribution of Molecular Cations by an Atomic Coulomb Probe Microscope
Xitao Yu1, Xiaoqing Hu2, Jiaqi Zhou3, Xinyu Zhang1, Xinning Zhao1, Shaokui Jia3, Xiaorui Xue3, Dianxiang Ren1, Xiaokai Li1, Yong Wu2, Xueguang Ren3, Sizuo Luo1*, and Dajun Ding1*
1Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
2Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
3School of Physics, Xi'an Jiaotong University, Xi'an 710049, China
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Xitao Yu, Xiaoqing Hu, Jiaqi Zhou et al  2022 Chin. Phys. Lett. 39 113301
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Abstract Imaging the charge distributions and structures of molecules and clusters will promote the understanding of the dynamics of the quantum system. Here, we report a method by using an Ar atom as a tip to probe the charge distributions of benzene (Bz) cations in gas phase. Remarkably, the measured charge distributions of Bz$^{+}$ ($\delta_{_{\scriptstyle \rm H}}=0.204$, $\delta_{_{\scriptstyle \rm C}}=-0.037$) and Bz$ ^{2+}$ ($\delta_{_{\scriptstyle \rm H}}=0.248$, $\delta_{_{\scriptstyle \rm C}}=0.0853$) agree well with the calculated Mulliken distributions, and the structures of Bz$_{2}$ is reconstructed by using the measured charge distributions. The structures of two Bz$_{2}$ isomers (T-shaped and PD isomers) can be resolved from the measured inter-molecular potential $V(R)$ between two Bz ions, and the structures of Bz dimer agree well with the theoretical predictions.
Received: 20 August 2022      Editors' Suggestion Published: 19 October 2022
PACS:  33.80.-h  
  33.80.Gj (Diffuse spectra; predissociation, photodissociation)  
  34.20.Gj (Intermolecular and atom-molecule potentials and forces)  
  36.40.Mr (Spectroscopy and geometrical structure of clusters)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/39/11/113301       OR      https://cpl.iphy.ac.cn/Y2022/V39/I11/113301
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Xitao Yu
Xiaoqing Hu
Jiaqi Zhou
Xinyu Zhang
Xinning Zhao
Shaokui Jia
Xiaorui Xue
Dianxiang Ren
Xiaokai Li
Yong Wu
Xueguang Ren
Sizuo Luo
and Dajun Ding
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