| 光谱学与光谱分析 |
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| Study on Decomposition Products of Methanol in AC Discharge by Spectroscopy |
| SUN Dian-ping,YANG Xiao-hua,LIU Yu-yan,CHEN Yang-qin* |
| Key Laboratory of Optical & Magnetic Resonance Spectroscopy, Department of Physics，East China Normal University，Shanghai 200062, China |
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Abstract The intermediate decomposition products of methanol (CH3OH) in an AC discharge were diagnosticated via concentration modulation spectroscopy. Several main vibrational bands of CO Angstrōm B1Σ＋-A 1Π system, CH A 2Δ-X 2Π system at 430 nm and B 2Σ－-X 2Π at 390 nm, as well as CHO(329.82 nm), CH2O(369.8 nm), CH3O(347.8 nm) and Balmer series spectra of H atom were identified in the region between 300 and 670 nm. Furthermore, the dependences of the emission spectral intensities of the intermediate decomposition products on the discharge voltage and parent gas pressure were investigated in detail. The experiments indicated that the relative population ratio of CO(B 1Σ＋) and H increases with increasing discharge voltage more quickly than that of CH(A 2Δ). Several possible reaction passages were given and discussed. Additionally, the vibrational and rotational temperatures of CH(A 2Δ) were determined to be about 4 200 and 1 100 K respectively, and the vibrational temperatures of CO(B 1Σ+) were determined to be about 2 500 K by analyzing the intensity distribution using LIFEBASE computer program. The decomposition mechanism of methanol in the discharge plasma was discussed as well.
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Received: 2007-03-25
Accepted: 2007-06-29
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Corresponding Authors:
CHEN Yang-qin
E-mail: yqchen@phy.ecnu.edu.cn
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