中国物理B ›› 2026, Vol. 35 ›› Issue (3): 33401-033401.doi: 10.1088/1674-1056/adf82e

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Experimental study on the vibrational relaxation mechanism of N2(X1Σ+g, v = 6) molecules in collision with N2, O2, and CO

Yaqi Zhang(张亚琦)1,2,†, Yuhao Wu(武宇豪)1,2,†, Jing Liu(刘静)1,2,‡, Jiaxin Lin(林佳欣)1,2, and Maofu Yu(于茂福)1,2   

  1. 1 Xinjiang Key Laboratory of Solid State Physics and Devices, Xinjiang University, Urumqi 830017, China;
    2 School of Physical Science and Technology, Xinjiang University, Urumqi 830017, China
  • 收稿日期:2025-07-02 修回日期:2025-08-01 接受日期:2025-08-06 出版日期:2026-02-11 发布日期:2026-03-03
  • 通讯作者: Jing Liu E-mail:xdlj@xju.edu.cn
  • 基金资助:
    Project supported by the Natural Science Foundation of Xinjiang Uygur Autonomous Region of China (Grant No. 2024D01C51).

Experimental study on the vibrational relaxation mechanism of N2(X1Σ+g, v = 6) molecules in collision with N2, O2, and CO

Yaqi Zhang(张亚琦)1,2,†, Yuhao Wu(武宇豪)1,2,†, Jing Liu(刘静)1,2,‡, Jiaxin Lin(林佳欣)1,2, and Maofu Yu(于茂福)1,2   

  1. 1 Xinjiang Key Laboratory of Solid State Physics and Devices, Xinjiang University, Urumqi 830017, China;
    2 School of Physical Science and Technology, Xinjiang University, Urumqi 830017, China
  • Received:2025-07-02 Revised:2025-08-01 Accepted:2025-08-06 Online:2026-02-11 Published:2026-03-03
  • Contact: Jing Liu E-mail:xdlj@xju.edu.cn
  • Supported by:
    Project supported by the Natural Science Foundation of Xinjiang Uygur Autonomous Region of China (Grant No. 2024D01C51).

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摘要： This study employed time-resolved coherent anti-Stokes Raman scattering to investigate the vibrational relaxation mechanism of N$_{2}$ ($v = 6$) molecules in N$_{2}$-$M$ systems, where $M$ denotes N$_{2}$, O$_{2}$, or CO. At 297 K, the relaxation rate coefficients for collisions between N$_{2}$ ($v = 6$) and N$_{2}$, O$_{2}$, and CO were determined to be $(2.85 \pm 0.07)\times 10^{-14}$ cm$^{3}\cdot$s$^{-1}$, $(6.29 \pm 0.12)\times 10^{-14}$ cm$^{3}\cdot$s$^{-1}$, and $(11.21 \pm 0.20)\times 10^{-14}$ cm$^{3}\cdot$s$^{-1}$, respectively. The results demonstrated that the relaxation rate coefficient for N$_{2}$ ($v = 6$)-CO collisions was 1.8 times higher than that for N$_{2}$-O$_{2}$ collisions and 3.9 times greater than that for homonuclear N$_{2}$-N$_{2}$ collisions, indicating that CO significantly enhances the vibrational relaxation of N$_{2}$ ($v = 6$). Furthermore, by analyzing the time-resolved population evolution of N$_{2}$ ($v \le 6$) in N$_{2}$-O$_{2}$ and N$_{2}$-CO systems under varying buffer gas molar ratios and integrating these data with kinetic analysis, the vibrational relaxation mechanism of N$_{2}$ ($v = 6$) in different collisional environments was systematically elucidated. The findings indicate that in the N$_{2}$-O$_{2}$ system, increasing the molar ratio of acceptor molecules leads to a gradual shift from single-quantum to multi-quantum relaxation dominance, whereas the N$_{2}$-CO system exhibits a transition from multi-quantum to single-quantum dominance. In addition, a systematic study examined the vibrational relaxation mechanism of N$_{2}$ ($v = 6$) in two gas mixtures between 297 K and 573 K. The results indicate that elevated temperature significantly enhances the efficiency of near-resonance energy transfer associated with the dominant relaxation pathway.

关键词: collision relaxation rate coefficients, vibrational energy near-resonance quantum exchange, multi-quantum relaxation mechanism, temperature dependence

Abstract: This study employed time-resolved coherent anti-Stokes Raman scattering to investigate the vibrational relaxation mechanism of N$_{2}$ ($v = 6$) molecules in N$_{2}$-$M$ systems, where $M$ denotes N$_{2}$, O$_{2}$, or CO. At 297 K, the relaxation rate coefficients for collisions between N$_{2}$ ($v = 6$) and N$_{2}$, O$_{2}$, and CO were determined to be $(2.85 \pm 0.07)\times 10^{-14}$ cm$^{3}\cdot$s$^{-1}$, $(6.29 \pm 0.12)\times 10^{-14}$ cm$^{3}\cdot$s$^{-1}$, and $(11.21 \pm 0.20)\times 10^{-14}$ cm$^{3}\cdot$s$^{-1}$, respectively. The results demonstrated that the relaxation rate coefficient for N$_{2}$ ($v = 6$)-CO collisions was 1.8 times higher than that for N$_{2}$-O$_{2}$ collisions and 3.9 times greater than that for homonuclear N$_{2}$-N$_{2}$ collisions, indicating that CO significantly enhances the vibrational relaxation of N$_{2}$ ($v = 6$). Furthermore, by analyzing the time-resolved population evolution of N$_{2}$ ($v \le 6$) in N$_{2}$-O$_{2}$ and N$_{2}$-CO systems under varying buffer gas molar ratios and integrating these data with kinetic analysis, the vibrational relaxation mechanism of N$_{2}$ ($v = 6$) in different collisional environments was systematically elucidated. The findings indicate that in the N$_{2}$-O$_{2}$ system, increasing the molar ratio of acceptor molecules leads to a gradual shift from single-quantum to multi-quantum relaxation dominance, whereas the N$_{2}$-CO system exhibits a transition from multi-quantum to single-quantum dominance. In addition, a systematic study examined the vibrational relaxation mechanism of N$_{2}$ ($v = 6$) in two gas mixtures between 297 K and 573 K. The results indicate that elevated temperature significantly enhances the efficiency of near-resonance energy transfer associated with the dominant relaxation pathway.

Key words: collision relaxation rate coefficients, vibrational energy near-resonance quantum exchange, multi-quantum relaxation mechanism, temperature dependence

中图分类号:  (Rotational and vibrational energy transfer)

  • 34.50.Ez
34.20.-b (Interatomic and intermolecular potentials and forces, potential energy surfaces for collisions) 33.80.-b (Photon interactions with molecules) 42.65.Dr (Stimulated Raman scattering; CARS)