| Chirping-dependent ionization and dissociation of methane in an intense femtosecond laser field |
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| 作者姓名： | 任海振 吴成印 马日 杨宏 蒋红兵 龚旗煌 |
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| 作者单位： | State Key Laboratory for Mesoscopic Physics，Department of Physics，Peking University，Beijing 100871，State Key Laboratory for Mesoscopic Physics，Department of Physics，Peking University，Beijing 100871，State Key Laboratory for Mesoscopic Physics，Department of Physics，Peking University，Beijing 100871，State Key Laboratory for Mesoscopic Physics，Department of Physics，Peking University，Beijing 100871，State Key Laboratory for Mesoscopic Physics，Department of Physics，Peking University，Beijing 100871，State Key Laboratory for Mesoscopic Physics，Department of Physics，Peking University，Beijing 100871 |
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| 基金项目： | National Key Basic Research Special Foundation (NKBRSF) under，国家自然科学基金 |
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| 摘 要： | We studied the ionization and dissociation of polyatomic molecule methane in an intense femtosecond laserfield with wavelength of 810 nm and intensities ranging from 1.4×10~(14)to 2.6×10~(15) W/cm~2 by massspeetroscopy.Abundant fragment inos were observed in addition to the strong parent ion.The effect offrequency chirp was investigated and it was found that the negatively chirped pulses dramatically enhancedthe dissociation probability,which might be used to control the dissociation pathways.
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Chirping-dependent ionization and dissociation of methane in an intense femtosecond laser field |
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| Abstract: | We studied the ionization and dissociation of polyatomic molecule methane in an intense femtosecond laser field with wavelength of 810 nm and intensities ranging from 1.4 × 1014 to 2.6 × 1015 W/cm2 by mass spectroscopy. Abundant fragment ions were observed in addition to the strong parent ion. The effect of frequency chirp was investigated and it was found that the negatively chirped pulses dramatically enhanced the dissociation probability, which might be used to control the dissociation pathways. |
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