Dissociation of methane in intense femtosecond laser field
Tang, XP; Wang, SF; Gao, LR; Wang, C; Kong, FA
AbstractMethane molecules were irradiated by a laser beam in the intensity range of 7.6 x 10(13) similar to 1.4 x 10(14) W.cm(-2) (800 nm, 160 fs). A time of flight mass spectrometer was coupled to the laser system. The parent ions can be seen at low laser intensity of 7.6 x 10(13) W.cm(-2). When the laser intensity increases to 8.0 x 10(13) W.cm(-2), CH3+ ions appear. The appearance of the CH2+, CH+, C+ ions are at the laser intensities of 1.0 X 10(14) W.cm(-2), 1.4 x 10(14) W.cm(-2) and 1.4 X 10(14) W.cm(-2), respectively. The facts show that dissociation of methane is a step-wise process. Coulomb explosion does not happen during the dissociation because no multi-electron ions are found in the mass spectra. Only H+ ion yield has anisotropic angular distribution when methane is irradiated by a linearly polarized laser. This fact implies that the chemical bonds in the molecule are pulled off by the laser field and that the H+ ion flies along the direction of the laser electronic field. The quasi-diatomic molecule model we proposed can explain the experimental results satisfactorily.
KeywordFemtosecond Laser Intense Laser Field Methane Tof-ms Dissociation
Indexed BySCI
WOS IDWOS:000184412100020
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorKong, FA
AffiliationChinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Tang, XP,Wang, SF,Gao, LR,et al. Dissociation of methane in intense femtosecond laser field[J]. ACTA PHYSICO-CHIMICA SINICA,2003,19(7):661-665.
APA Tang, XP,Wang, SF,Gao, LR,Wang, C,&Kong, FA.(2003).Dissociation of methane in intense femtosecond laser field.ACTA PHYSICO-CHIMICA SINICA,19(7),661-665.
MLA Tang, XP,et al."Dissociation of methane in intense femtosecond laser field".ACTA PHYSICO-CHIMICA SINICA 19.7(2003):661-665.
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