Abstract
Recently multiphoton ionisation experiments with molecular hydrogen have shown a large amount of dissociation into low-energy fragments (Bucksbaum et al., 1990). The mechanism proposed for this process was bond-softening in H +2 i.e. a change of the potential curves under influence of the field that weakens the molecular bond and lowers the barrier to dissociation. This explanation has been very succesful, because it also predicts the occurrence of above-threshold dissociation, (the absorption of additional photons during the dissociation process leading to more energetic fragments) that was indeed observed in the same experiment.
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References
Allendorf, S. W., and Szöke, A., 1991, High intensity multiphoton ionization of H2, in: “Short-Wavelength Coherent Radiation: Generation and Application,” Opt. Soc. Am. 1991 Technical Digest Series
Bucksbaum, P. H., Zavriyev, A., Muller, H. G., and Schumacher, D. W., 1990, Softening of the H +2 molecular bond in intense laser fields, Phys. Rev. Lett. 64:1883
Verschuur, J. W. J., Noordam, L. D., and Van Linden van den Heuvell, H. B., 1989, Anomalies in above-threshold ionization observed in H2 and its excited fragments, Phys. Rev. A 40:4383
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© 1992 Springer Science+Business Media New York
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Muller, H.G. (1992). Calculation of Potential Curves for H +2 Molecules in a Strong Laser Field. In: Bandrauk, A.D., Wallace, S.C. (eds) Coherence Phenomena in Atoms and Molecules in Laser Fields. NATO ASI Series, vol 287. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3364-1_9
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DOI: https://doi.org/10.1007/978-1-4615-3364-1_9
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