Vibrational relaxation and dephasing of Rb2 attached to helium nanodroplets |
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Authors: | Grüner B Schlesinger M Heister Ph Strunz W T Stienkemeier F Mudrich M |
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Institution: | Physikalisches Institut, Universit?t Freiburg, 79104 Freiburg, Germany. |
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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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