Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (10): 20220393.doi: 10.7503/cjcu20220393

• Organic Chemistry • Previous Articles     Next Articles

Dynamics Study of Intramolecular Vibrational Energy Redistribution in RDX Molecule

ZHANG Lingyu, ZHANG Jilong(), QU Zexing()   

  1. Institute of Theoretical Chemistry,College of Chemistry,Jilin University,Changchun 130023,China
  • Received:2022-06-05 Online:2022-10-10 Published:2022-07-28
  • Contact: ZHANG Jilong,QU Zexing E-mail:jilongzhang@jlu.edu.cn;zxqu@jlu.edu.cn
  • Supported by:
    the 2020 Ji Chu Jia Qiang(JCJQ) Project, China(GFJQ2126-007)

Abstract:

In this paper, based on the Born-oppenheimer molecular dynamics(BOMD) simulations, the coupling matrix between different vibrational modes of cyclotrimethylene trinitramine(RDX) single molecule was constructed, and the optimal energy transfer pathways from low-frequency vibrational mode to high-frequency vibrational mode with different initiation energies were obtained. The results showed that the —NNO2 group in RDX single molecule was more favorable for energy localization, while vibrational mode v3 and vibrational mode v4 played an important role in the energy transfer process from low-frequency vibrational mode to high-frequency vibrational mode. The further analysis for the two vibrational modes of v3 and v4 suggested that different initiation energy could lead to different energy transfer pathways for RDX single molecule. With the lower initiation energy, the RDX single molecule tended to follow the energy transfer pathway as, low-frequency vibrational mode → medium-frequency vibrational mode → high-frequency vibrational mode. With the higher initiation energy, the energy tended to transfer from the low-frequency vibrational mode to the high-frequency vibrational mode. This work reveals the detail mechanism of the intramolecular vibrational energy redistribution in single RDX molecule, and can be further applied in the investigation of other energy transfer process.

Key words: Cyclotrimethylene trinitramine(RDX), Intramolecular vibrational energy redistribution(IVR), Energy transfer, Born-oppenheimer molecular dynamics(BOMD)

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