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| Abstract: |
| The photo ionization of furan by an intense 25 ns Nd:YAG 532 nm laser has been studied by time-of-flight mass spectrometry. At the laser intensity of 1010～1011 W/cm2, multi-charged ions Can+ (n=2～4) and Ohm+ (m=2～3) appeared in the mass spectra when argon was used as the carrier gas. From the peak splitting and the numeric analysis, the most probable kinetic energies of C2+, C3+ and C4+ were confirmed to be 21、63 and 100 eV respectively, and the most probable kinetic energies of O2+ and O3+ were confirmed to be 20 and 40 eV respectively. It is proposed that the multi-charged ions come from the Coulomb explosion of furan cluster ions produced by multi photon ionization of neutral furan cluster. |
| Key words: Furan, Coulomb explosion, Multi-charged ions, Nanosecond lase |
| FundProject: |
附件 |
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| 纳秒强光场下呋喃的激光电离中高价离子的产生 |
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孔祥蕾, 牛冬梅, 罗晓琳, 张先燚, 张树东, 阚瑞峰, 李海洋*
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中国科学院安徽光学精密机械研究所环境光谱学实验室,合肥,230031
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| 摘要: |
| 利用25 ns脉冲Nd:YAG 532 nm的激光,在1011 W/cm2的光场强度下,用飞行时间质谱对不同条件下呋喃的激光电离过程进行了研究.当利用氩作为载气时,首次观察到了较强的Cn+(n=2～4)和Om+(m=2～3)离子信号.通过测定峰分裂和数值模拟计算的方法可以确定其中C2+、 C3+ 和C4+的最可几平动能分别为21、 63和100 eV, O2+ 和O3+的最可几平动能分别为20和40 eV.质谱峰型的分裂现象和激光延迟实验结果表明,这些高价离子可能来源于呋喃团簇的库仑爆炸过程. |
| 关键词: 呋喃 库仑爆炸 高价离子 纳秒激光 |
| DOI：10.1088/1674-0068/17/5/513-517 |
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