Abstract
Polyatomic molecules undergo neutral dissociation in moderate intense laser fields. As a typical molecule species, methane has been studied in the laser intensity of 1012 – 1013W/cm2 of a Ti-sapphire laser (λ = 800nm). The fragments of electronically excited CH (A 2Δ, B 2Σ, C 2Σ+) and H (n = 3), where n is the principal quantum number, are observed in the fluorescence spectrum. It is interesting that the same products were found in the synchrotron radiation previously, where the XUV photons of 10–22.5eV were used. The above phenomena show that the fragmentation in the intense laser field through multiphoton absorption and in the synchrotron radiation through single XUV photon absorption are due to the excitation and dissociation of super-excited states, which have more energy than the ground state of molecular ion.
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Kong, F., Chin, S. (2008). Non-Coulomb Explosions of Molecules in Intense Laser Fields. In: Progress in Ultrafast Intense Laser Science III. Springer Series in Chemical Physics, vol 89. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-73794-0_6
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DOI: https://doi.org/10.1007/978-3-540-73794-0_6
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