Abstract：The difference between electron temperature and excitation temperature is analyzed in the aspect of statistics thermodynamics. It is presented clearly that the temperature acquired by spectral line intensity method is not free electron temperature, but internal electronic excitation temperature of heavy particle. Under thermal equilibrium condition, the excitation temperature is equal to the electron temperature, while under non-thermal equilibrium condition, the excitation temperature is not equal to the electron temperature. In the study of arc jet plume in vacuum chamber，spectral line intensity method was employed to measure the apparent excitation temperature of arc jet plume, and Langmuir probe was employed to measure the electron temperature of arcjet plume. The big difference between the excitation temperature and the electron temperature proved that the temperature acquired by spectral line intensity method is not free electron temperature.
Key words：Spectral line intensity method; Excitation temperature; Electron temperature; Arc jet
赵文华,唐皇哉*,沈岩,石勇,侯凌云. 谱线强度法所测得温度的物理意义[J]. 光谱学与光谱分析, 2007, 27(11): 2145-2149.
ZHAO Wen-hua, TANG Huang-zai*,SHEN Yan, SHI Yong, HOU Ling-yun . Physical Meaning of Temperature Measured by Spectral Line Intensity Method. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(11): 2145-2149.
[1] Dieter M Zube，Monika Auweter-Kurtz. 29th Joint Propulsion Conference and Exhibit，Monterey，CA, USA，June. AIAA，1993. 1792. [2] Zhao Wen-hua, Li Jian-quan, YANG J D, et al. IEEE Transactions on Plasma Science, 1997, 25(5): 828. [3] DENG Hong-yan, WANG Jia-kou, WANG Wei-dong, et al(邓红艳，王加扣，王卫东，等). Journal of Atomic and Molecular Physics(原子与分子物理学报), 2005, 20(3): 256. [4] TANG Xiao-liang, FENG Xian-ping, LI Zhi-guang, et al(唐晓亮，冯贤平，黎志光，等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2004, 24(11): 1437. [5] ZHAO Wen-hua, SHEN Yan, CHEN Li-ming, et al(赵文华，沈 岩，陈黎明，等). Spectroscopy and Spectral Analysis (光谱学与光谱分析), 2004, 24(8): 897. [6] DONG Li-fang, RAN Jun-xia, et al(董丽芳，冉俊霞，等). Acta Physica Sinica(物理学报), 2005, 54(5): 2167. [7] Eddy T L. J. Thermophysics, 1991, 5(4): 481. [8] Venugopalan V. Reactions under Plasma Conditions(Vol.1). John Wiley&Sons, Inc. 1971. 112. [9] CHUL Park. Journal of Quantitative Spectroscopy and Radiative Transfer, 1972, 12: 323. [10] LI He-ping, et al(李和平，等). Journal of Engineering Thermophysics(工程热物理学报), 1999, 20(3): 211. [11] Hyung Jin Kim, Sang Hee Hong. IEEE Transactions on Plasma Science, 1995, 23(5): 852.
