Nonadiabatic Laser-Induced Alignment Dynamics of Molecules on a Surface
Sprache des Titels:
Englisch
Original Kurzfassung:
We demonstrate that a sodium dimer, Na 2 š1 3 ? ž
u Ž, residing on the surface of a helium nanodroplet, can be
set into rotation by a nonresonant 1.0 ps infrared laser pulse. The time-dependent degree of alignment
measured, exhibits a periodic, gradually decreasing structure that deviates qualitatively from that expected
for gas-phase dimers. Comparison to alignment dynamics calculated from the time-dependent rotational
Schrödinger equation shows that the deviation is due to the alignment dependent interaction between the
dimer and the droplet surface. This interaction confines the dimer to the tangential plane of the droplet
surface at the point where it resides and is the reason that the observed alignment dynamics is also well
described by a 2D quantum rotor model.
Forschungs-