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激光烧蚀Al热原子与CF4反应中C2的形成及其发光光谱研究

张树东 李海洋

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激光烧蚀Al热原子与CF4反应中C2的形成及其发光光谱研究

张树东, 李海洋

Formation and emission spectra of C2 swan band during the reaction of laser ablating target of aluminum with CF4 beam

Zhang Shu-Dong, Li Hai-Yang
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  • 脉冲激光烧蚀金属平面铝靶产生的热原子与气相CF4碰撞反应中,在400—600nm之间观测到激发态C2分子的发光光谱,它们可归属为Swan带的d3Πg-a3Πu跃迁中Δv=2,1,0,-1,-2五个振动序列(v'≤6).光谱强度分析表明,C2激发态的振动温度达6340K左右.与激光烧蚀Al+O2反应生成AlO的实验结果以及激光烧蚀Cu+CF4的光谱比较,对比Al(2P1/2-2S1/2,3944nm)和C2的d—a跃迁(0—0)带带头(5165nm)的飞行时间轮廓,认为激发态的Al(2S1/2)原子通过
    The emission spectra of C2 Swan band transition has been observed in the 430nm-600nm region by Qswitch laser ablating target of Al and reacting with CF4 beam.Five vibrational band sequences (Δv=2,1,0,-1 and -2) of d3Πga3Πu are identified and the largest vibrational number of the excited state d is 6.Using a local thermal equilibrium model, the vibrational temperature of d state is about 6340K. Emission spectra from AlF have not been found. Comparing with the results of laserablated Al+O2 system and similar experiment of Cu+CF4 system, while the timeofflight profile of Al(2P1/2-2S1/2,3944nm)and(0,0)band head of C2 are analyzed, we consider that the primary reason of the producing of excited state d3Πg is the electronic energy transformation between excited states Al(2S1/2) and C2.
    • 基金项目: 国家自然科学基金(批准号20073042)资助的课题
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  • 文章访问数:  7550
  • PDF下载量:  856
  • 被引次数: 0
出版历程
  • 收稿日期:  2002-08-07
  • 修回日期:  2002-09-18
  • 刊出日期:  2003-05-20

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