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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 36 (1996), S. 349-364 
    ISSN: 1434-6079
    Keywords: 36.40 ; 34.30. + h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The formation of protonated and unprotonated ammonia cluster ions is studied by femtosecond two colour two photon pump-probe techniques applied to (NH3) n and (ND3) n clusters withn up to 8. The fourth harmonic (∼ 200 nm, 6.2 eV, 160 fs) of a Ti: Sapphire laser pulse is used to excite the clusters in a state corresponding to theà state of NH3 while the third harmonic (267 nm, 4.65 eV) is used for the subsequent ionisation step. Employing a combination of the optical Bloch equations for the excitation process and rate equations for the cluster dynamics we calibrate the zero time delay and carefully analyse the time dependence of the pump-probe signal. Several distinct intermediate steps in the time evolution can be distinguished, having characteristic time constants ranging from 40 fs to over 100 ps. They are discussed in a consistent scheme for the excitation, ionisation and protonation dynamics, accounting also for characteristic differences observed between deuterated and undeuterated species. A particularly remarkable time dependence of the homogeneous (NH3) 2 + cluster ion signal is interpreted as a fingerprint of internally protonated neutral precursors of the type NH3NH2NH4.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 26 (1993), S. 213-216 
    ISSN: 1434-6079
    Keywords: 33.20.Lg ; 36.40.+d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Vibrationally resolved electronic spectra of heteroclusters C6H6-SF6 and C6H6-(SF6)2 were studied in the spectral regions near the S0-S1, 0 0 0 and 6 0 1 transitions of the benzene monomer. A nonvanishing 0 0 0 vibrational band has been observed for C6H6-SF6 with a C3v symmetry. For both clusters we have determined the ionization potentials as well as the binding energies in the electronic ground state and the ionization state. The fragmentation of larger clusters (C6H6)n(SF6)m is restricted to the loss of SF6 molecules while the emission of C6H6 molecules have not been observed.
    Type of Medium: Electronic Resource
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