Dataset Information


Ultrafast relaxation of photoexcited superfluid He nanodroplets.

ABSTRACT: The relaxation of photoexcited nanosystems is a fundamental process of light-matter interaction. Depending on the couplings of the internal degrees of freedom, relaxation can be ultrafast, converting electronic energy in a few fs, or slow, if the energy is trapped in a metastable state that decouples from its environment. Here, we study helium nanodroplets excited resonantly by femtosecond extreme-ultraviolet (XUV) pulses from a seeded free-electron laser. Despite their superfluid nature, we find that helium nanodroplets in the lowest electronically excited states undergo ultrafast relaxation. By comparing experimental photoelectron spectra with time-dependent density functional theory simulations, we unravel the full relaxation pathway: Following an ultrafast interband transition, a void nanometer-sized bubble forms around the localized excitation (He[Formula: see text]) within 1 ps. Subsequently, the bubble collapses and releases metastable He[Formula: see text] at the droplet surface. This study highlights the high level of detail achievable in probing the photodynamics of nanosystems using tunable XUV pulses.


PROVIDER: S-EPMC6949273 | BioStudies | 2020-01-01

REPOSITORIES: biostudies

Similar Datasets

1000-01-01 | S-EPMC5591197 | BioStudies
2014-01-01 | S-EPMC4166682 | BioStudies
1000-01-01 | S-EPMC6329814 | BioStudies
1000-01-01 | S-EPMC4019955 | BioStudies
1000-01-01 | S-EPMC6162074 | BioStudies
1000-01-01 | S-EPMC4992059 | BioStudies
2013-01-01 | S-EPMC3790455 | BioStudies
2014-01-01 | S-EPMC4106244 | BioStudies
1000-01-01 | S-EPMC5818503 | BioStudies
2014-01-01 | S-EPMC4141898 | BioStudies