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 sp...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.展开更多
基金This work was supported by the National Key Basic Research Special Foundation(NKBRSF)under Grant No.G1999075207the National Natural Science Foundation of China under Grant No.19884001,10104003 and 90101027.
文摘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.
