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Vibrational relaxation and dephasing of Rb2 attached to helium nanodroplets
B Grüner1, M Schlesinger, Ph Heister
1Physikalisches Institut, Universität Freiburg, 79104 Freiburg, Germany.
Abstract:
The vibrational wave-packet dynamics of diatomic rubidium molecules (Rb(2)) in triplet states formed on the surface of superfluid helium nanodroplets is investigated both experimentally and theoretically. Detailed comparison of experimental femtosecond pump-probe spectra with dissipative quantum dynamics simulations reveals that vibrational relaxation is the main source of dephasing. The rate constant for vibrational relaxation in the first excited triplet state 1(3)Σ(g)+ is found to be constant γ ≈ 0.5 ns(-1) for the lowest vibrational levels v ≲ 15 and to increase sharply when exciting to higher energies.
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