11.1 Cluster Dissociation
183
Fig. 11.4 The photodissociation spectra of ScFe + (a), TiFe + (b), CrFe + (c), Fe 2
+ (d), CoFe + (e),
NiFe + (f), CuFe + (g), NbFe + (h), and TaFe + (i) obtained by monitoring the appearance of Fe + and
M + (M = Sc, Ti, Cr, Fe, Co, Ni, Cu, Nb, and Ta) as a function of wavelength. Reproduced with
permission from Ref. [10]. Copyright 1987 American Chemical Society
Coulomb explosion experiments generally serve two main purposes: (1) to yield
valuable information on the interactions of fast ions with solids; (2) to determine
the stereochemical structures of molecular-ion projectiles. For example, Coulomb
explosion and photodissociation channel of H 2
+ and D 2
+ have been investigated
with 790 nm, sub-100 fs laser pulses by employing a high-resolution photofragment
imaging technique [48]. At intensities close to the threshold for Coulomb explosion,
they observed a peak structure in the Coulomb explosion kinetic energy spectra for
both H 2
+ and D 2
+ , which was attributed to the different dissociation energies on
vibrationally excited states of the molecules. Preservation of vibrational structure
during the Coulomb explosion suggests ionization at a critical internuclear distance.
When using pulses with durations of 200–500 fs, three Coulomb explosion kinetic
energy groups were observed with different angular distributions in both H 2
+ and
D 2
+ .
183
Fig. 11.4 The photodissociation spectra of ScFe + (a), TiFe + (b), CrFe + (c), Fe 2
+ (d), CoFe + (e),
NiFe + (f), CuFe + (g), NbFe + (h), and TaFe + (i) obtained by monitoring the appearance of Fe + and
M + (M = Sc, Ti, Cr, Fe, Co, Ni, Cu, Nb, and Ta) as a function of wavelength. Reproduced with
permission from Ref. [10]. Copyright 1987 American Chemical Society
Coulomb explosion experiments generally serve two main purposes: (1) to yield
valuable information on the interactions of fast ions with solids; (2) to determine
the stereochemical structures of molecular-ion projectiles. For example, Coulomb
explosion and photodissociation channel of H 2
+ and D 2
+ have been investigated
with 790 nm, sub-100 fs laser pulses by employing a high-resolution photofragment
imaging technique [48]. At intensities close to the threshold for Coulomb explosion,
they observed a peak structure in the Coulomb explosion kinetic energy spectra for
both H 2
+ and D 2
+ , which was attributed to the different dissociation energies on
vibrationally excited states of the molecules. Preservation of vibrational structure
during the Coulomb explosion suggests ionization at a critical internuclear distance.
When using pulses with durations of 200–500 fs, three Coulomb explosion kinetic
energy groups were observed with different angular distributions in both H 2
+ and
D 2
+ .