Non adiabatic effects in H{sub 2}{sup +} dissociation dynamics induced by short intense laser pulses
Conference
·
OSTI ID:447627
- Universite Paris-Sud, Orsay (France)
Non adibatic effects resulting from very short risetimes (few femloseconds) of intense (tons of TW/cm{sup 2}) lasor pulses may enhance in an u expected way dissociation rates of molecules interacting with such radiation fields. Starting from a given initial vibrational level, the wavepacket describing the molecule-plus-field system is spread over several resonances (instead of a single one predicted when the laser is adiabatically switched on) interfering during the excitation process. Some of them lead to efficient dissociation by the so called bond softening mechanism resulting from field induced potential barrier lowering, whereas others are temporarily confined by the laser through the so called vibrational trapping mechanism. The paper reviews typical signature of the time dependent non adiabatic behaviour of the evolution and survival probabilities of vibrational pulses and their consequences on the fragments kinetic energy spectra H{sub 2}{sup +} molecular ion irradiated by short intense laser pulses in the UV absorption wavelength regime is taken as an illustrative example. A possibility of dissociating the system using a single photon of 532 nm wavelength is devised, with this peculiarity that the energy carried by this photon is not enough for the fragmentation to occur. The suggested mechanism, which may be called Helow Threshold Dissociation, refers to a highly non adiabatic switching on of the laser leading to the temporal excitation of more resonances with efficient decay rates.
- OSTI ID:
- 447627
- Report Number(s):
- CONF-960343--
- Country of Publication:
- United States
- Language:
- English
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