高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

(SO2)2在SO2单体反对称伸缩振动区域的振转光谱研究

李响1，彭康宁1，刘壮1，罗威2，卢燕3，郑锐1
  

  1. 1.南昌师范学院物理与电子信息学院

    2.东华理工大学理学院 3.南昌师范学院化学与食品科学学院

  • 收稿日期:2026-03-21 修回日期:2026-04-24 网络首发:2026-05-01 发布日期:2026-05-01
  • 通讯作者: 郑锐 E-mail:zhengrui@ncwu.edu.cn
  • 基金资助:
    国家自然科学基金（批准号：12464038，12564035）、江西省自然科学基金（批准号：20242BAB20031，20252BAC240159）、河南省科技攻关项目（批准号：252102211100）、江西省教育厅科技项目（批准号：GJJ2401902）和南昌师范学院博士科研启动基金（批准号：NSBSJJ2023010）资助

Rovibrational spectrum of (SO2)2 complex in the ν3 region of SO2

LI Xiang1, PENG Kangning1, LIU Zhuang1, LUO Wei2, LU Yan3, ZHENG Rui1*   

  1. 1. College of Physics and Electronic Information, Nanchang Normal University

    2. School of Science, East China University of Technology

    3. College of Chemistry and Food Science, Nanchang Normal University

  • Received:2026-03-21 Revised:2026-04-24 Online First:2026-05-01 Published:2026-05-01
  • Supported by:
    Supported by the National Natural Science Foundation of China(Nos.12464038, 12564035), the Natural Science Foundation of Jiangxi Provincial, China(Nos.20242BAB20031, 20252BAC240159), the Science and Technology Research Project of Henan Provincial, China(No.252102211100), the Science and Technology Research Project of Jiangxi Provincial Department of Education, China(No.GJJ2401902) and the Nanchang Normal University of Doctoral Research Initiation Foundation, China(No.NSBSJJ2023010)

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摘要： 本文利用中红外连续可调谐外腔量子级联激光器结合脉冲超声喷射红外吸收光谱技术，在SO2分子ν3反对称伸缩振动带附近首次测量得到(SO2)2的高分辨振转光谱。实验共标识出490条红外跃迁，其中电子供体（ED）谱带包含395条跃迁（J ≤ 29，Ka ≤ 11），电子受体（EA）谱带包含95条跃迁（J ≤ 21，Ka ≤ 8）。结合已报道的微波光谱数据、SO2单体v1激发态光谱以及本文新测光谱数据，基于非对称陀螺哈密顿量进行最小二乘法全局拟合，得到了包括转动常数和离心畸变常数在内的精确的基态和激发态光谱参数。结果表明，(SO2)2 ED和EA谱带的带头位置分别为1355.77424(14) cm-1和1356.34969(27) cm-1，相较于SO2单体ν3带带头分别产生6.29 cm-1和5.71 cm-1的红移。

关键词: 振转光谱, 二氧化硫二聚体, 超声分子束, 振动频移

Abstract: In this work, high-resolution rovibrational spectrum of (SO2)2 in the ν3 asymmetric stretching region of SO2 were measured using a mid-infrared continuously tunable external cavity quantum cascade laser combined with pulsed supersonic jet infrared absorption spectroscopy. A total of 490 infrared transitions were identified, including 395 transitions in the electron-doner (ED) band (J ≤ 29, Ka ≤ 11) and 95 transitions in the electron-acceptor (EA) band (J ≤ 21, Ka ≤ 8). By integrating previously reported microwave spectral data, spectral data of SO2 monomer in the v1 excited state, and the newly measured spectral data in this work, global fitting was performed based on the asymmetric top Hamiltonian, yielding accurate ground and excited state spectroscopic parameters including rotational constants and centrifugal distortion constants. The band origins of the ED and EA bands of (SO2)2 are 1355.77424(14) cm-1 and 1356.34969(27) cm-1, respectively, exhibiting red shifts of 6.29 cm-1 and 5.71 cm-1 compared to the band origin of the v3 band of SO2 monomer.

Key words: Rovibrational spectrum, Sulfur dioxide dimer, Supersonic jet, Vibrational frequency shift

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