物理学报2025，Vol.74Issue(17)：57-63,7.DOI:10.7498/aps.74.20250726
32SF6-Ar和32SF6-34SF6复合物在10.6 μm处的垂直振动谱带的转动分析
Rotational analysis of the perpendicular vibrational bands of 32SF6-Ar and 32SF6-34SF6 complexes at 10.6 μm
摘要
Abstract
Sulfur hexafluoride(SF6)is widely used in the electrical and electronic industries.It is also an important green-house gas.The study of spectra and structures of weakly bound complexes containing SF6 is helpful to gain a deep understanding of the intermolecular interactions between SF6 and other atoms or molecules.The rotationally resolved spectrum of the perpendicular vibrational band of 32SF6-Ar in the 32SF6 v3 band region has been reported previously but the rotational analysis was not completed.In this work,this vibrational band of 32SF6-Ar is re-investigated.The jet-cooled rovibrational spectra of SF6/Ar/He gas mixtures are measured by a continuous-wave distributed feed-back quantum cascade laser(DFB-QCL)at 10.6 μm with a segmented-rapid-scan data acquisition scheme.The gas mixture(SF6∶Ar∶He=0.12∶1∶100)is expanded into a cylinder vacuum chamber through a 0.8 mm pin-hole nozzle.The probe laser is reflected about 90 times by a pair of astigmatic mirrors inside the chamber.The observed spectrum is analyzed by the standard symmetric-top Hamiltonian with the program PGOPHER.When the resonance interaction between the l=±1 levels in the double-degenerate excited vibrational state of 32SF6-Ar is considered,which was ignored in previous studies,a successful rotational analysis of the perpendicular vibrational band is conducted.The band-origin of the perpendicular band is determined to be v0=947.45300(58)cm-1 and the resonance interaction parameter is q=-0.002325(70)cm-1.A set of absorption lines close to the Q branch of the 32SF6 v3 band is tentatively assigned to the perpendicular vibrational band of 32SF6-34SF6 complex.This band is heavily overlapped by the monomer lines so that very few lines can be assigned.The band-origin of this band is estimated to be 948.1181(12)cm-1.These results will be useful for developing highly accurate intermolecular potential energy surfaces for SF6-Ar complex and SF6 dimer in the future.关键词
振动转动光谱/原子分子团簇/六氟化硫Key words
vibration-rotational spectrum/atomic and molecular clusters/sulfur hexafluoride引用本文复制引用
袁洪瑞,刘云,李响,段传喜..32SF6-Ar和32SF6-34SF6复合物在10.6 μm处的垂直振动谱带的转动分析[J].物理学报,2025,74(17):57-63,7.基金项目
中核集团青年英才科研项目、粒子输运与富集技术全国重点实验室基金(批准号:KGKF-2024-4)和中央高校基本科研业务费(批准号:CCNU25JC021)资助的课题. Project supported by the Young Talents Research Project of China National Nuclear Corporation,the National Key Laboratory of Particle Transport and Separation Technology(Grant No.KGKF-2024-4)and the Fundamental Research Funds for the Central Universities of China(Grant No.CCNU25JC021). （批准号:KGKF-2024-4）
