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Cavity Ringdown Spectroscopy of PH2 Radical in 465-555 nm
Dong-feng Zhao,Cheng-bing Qin,Qun Zhang,Yang Chen*
Author NameAffiliationE-mail
Dong-feng Zhao Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Cheng-bing Qin Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Qun Zhang Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Yang Chen* Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China yangchen@ustc.edu.cn 
Abstract:
Absorption spectra of jet-cooled PH2 radicals were recorded in the wavelength range of 465-555 nm using cavity ringdown spectroscopy. The PH2 radicals were produced in a supersonic jet by pulsed direct current discharge of a mixture of PH3 and SF6 in argon. Seven vibronic bands with fine rotational structures have been observed and assigned as 000、2n0、2n1(n=1-3) bands of the ?2A1- Χ2B1 electronic transition. Rotational assignments and rotational term values for each band were re-identified, and the molecular parameters including rotational constants, centrifugal distortion constants, and spin-rotation interaction constants were also improved with reasonably high precision. In addition, large perturbations observed in each quantum number of total angular momentum of the a axis level of the excited vibronic states were briefly discussed.
Key words:  PH2 radical, DC discharge, Cavity ringdown spectroscopy
FundProject:
光腔衰荡光谱研究PH2自由基在465-555 nm的光谱
赵东锋,秦成兵,张群,陈旸*
摘要:
采用光腔衰荡光谱记录了465-555 nm范围内PH2自由基在射流冷却条件下的吸收光谱. 在超声射流条件下对氩载气中的PH3和SF6混合物直流放电产生PH2自由基. 得到了7个有精细转动结构的振转谱带,并归属为PH2自由基?2A1- Χ2B1电子跃迁的000、2n0、2n1 (n=1-3)跃迁. 在已有的基础上,重新归属每一个振转谱带的转动量子数和转动项值;进一步精细化转动常数、离心畸变常数和自旋转动相互作用常数. 另外还简单讨论了每个K结构受到其它电子态的微扰.
关键词:  PH2自由基,直流放电,光腔衰荡光谱
DOI:10.1088/1674-0068/24/01/8-15
分类号: