Abstract
Using time-of-flight mass spectrometer, the femtosecond laser-induced dissociative ionization and Coulomb explosion of ethanol under irradiation of 130 fs pulse duration laser of linear and circular polarization at 810 nm, have been investigated. Coulomb explosion of C 2H 5OH molecule was observed to undergo a two-step process with one bond of the C C O skeleton atoms breaks firstly then the other. The similar laser intensity dependence of C 2H n OH + ( n = 1–4) ion yields and the molecular ion C 2H 5OH + indicated that they are the results of multiphoton ionization of inner-valence electrons followed by radiationless transitions to various dissociation channels of C 2H 5OH +. By analyzing the momentum-scaled spectra, the intermediate daughter ions CH 2OH + and C H 3 + , C 2 H 5 + and OH + were concluded to be originated from the same Coulomb explosion channel of C 2H 5OH 2+ ion, respectively. The atomic ion C 2+ showed an anisotropic angular distribution, which is reassessed to the geometric alignment mechanism.
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