The prospect of cooling matter down to temperatures that are close to absolute zero raises
intriguing questions about how chemical reactivity changes under these extreme conditions …

Our main knowledge about astrophysical environments relies on radiative spectra.
Absorption studies require background sources that are located hapharzadly in …

Ultracold molecules offer unprecedented opportunities for the controlled interrogation of
molecular events, including chemical reactivity in the ultimate quantum regime. The …

Experiments have lagged theory in exploring chemical interactions at temperatures so low
that translational degrees of freedom can no longer be treated classically. The difficulty has …

At low energies, the quantum wave–like nature of molecular interactions results in distinctive
scattering behavior, ranging from the universal Wigner laws near 0 kelvin to the occurrence …

In molecular collisions, resonances occur at specific energies at which the colliding particles
temporarily form quasibound complexes, resulting in rapid variations in the energy …

The prospect of studying state-to-state chemical reaction dynamics, with full control over all
of the reaction parameters, is becoming a reality for a small number of systems. Thanks to …

The collision dynamics between a pair of aligned molecules in the presence of a partial-
wave resonance provide the most sensitive probe of the long-range anisotropic forces …

Quantum phenomena in the translational motion of reactants, which are usually negligible at
room temperature, can dominate reaction dynamics at low temperatures. In such cold …

Partial wave resonances predicted to occur in bimolecular collision processes have proven
challenging to observe experimentally. Here, we report crossed-beam experiments and …