Abstract
Context
The UV(ultraviolet) absorption spectrum of PETN under different electric field loading directions(X, Y, and Z) with the value of strength range from 0.001 a.u. to 0.006 a.u. was calculated with the TDDFT(Time-dependent density functional) in this work. With the increase of electric field strength, the absorbance of PETN in the ultraviolet band decreases. To explain the action mechanism of the electric field on PETN UV(ultraviolet) absorption spectrum, we analyzed and counted the contribution rate, oscillator strength, and vertical excitation energy of the main excitation process whose contribution rate to the UV absorption spectrum is greater than 10%. The contribution of PETN to the UV spectrum in all directions without an electric field was also listed to investigate the anisotropy of PETN in the excitation process under an electric field. The hole-electron analysis showed that the electric field will enhance the charge transfer characteristics in the excitation process of PETN. To investigate the anisotropy of the response under different electric field application directions, the contribution of the UV absorption spectrum in different directions was studied.
Methods
Optimization and TDDFT calculation were performed at the level of M06-2X/def2-TZVP and PBE0/def2-TZVP respectively, with Gaussian09 program. The hole-electron analysis and UV absorption spectrum plotting were performed with Multiwfn3.8.
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Acknowledgements
The authors are grateful for the financial support from Science and Technology on Applied Physical Chemistry Laboratory, Shaanxi Applied Physics-Chemistry Research Institute.
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Bao-sen Zhang: calculation of ESPs and TDDFT; data analysis and curation; writing—original draft.
Shu-hai Zhang: conceptualization; management of scientific research; writing—original draft.
Fu-de Ren, Rui-jun Gou, Shang-biao Feng: data analysis and technical graphics.
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Highlights
• TDDFT calculations under the electric field.
• Anisotropy analysis of PETN.
• Effect of electric field on the excited states of PETN.
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Zhang, Bs., Zhang, Sh., Ren, Fd. et al. TDDFT calculations of the PETN’s ultraviolet absorption spectrum under the electric field loading. J Mol Model 29, 39 (2023). https://doi.org/10.1007/s00894-023-05446-2
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DOI: https://doi.org/10.1007/s00894-023-05446-2