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Cavity Ringdown Spectroscopy of PH2 Radical in 465-555 nm
Dong-feng Zhao, Cheng-bing Qin, Qun Zhang, 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
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*
中国科学技术大学合肥微尺度物质科学国家实验室,化学物理系,合肥230026
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
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