1.
Phys Chem Chem Phys
; 13(15): 6816-26, 2011 Apr 21.
Article
in English
| MEDLINE
| ID: mdl-21394372
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 â² 15 and to increase sharply when exciting to higher energies.