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Quantum-Controlled Collisions of H₂ Molecules.

Nandini Mukherjee¹

¹Department of Chemistry, Stanford University, Stanford, California94305, United States.

The Journal of Physical Chemistry. A

|January 5, 2023

Summary

Precise quantum state preparation in cold scattering experiments allows detailed study of molecular interactions. Stark-induced adiabatic Raman passage (SARP) enables quantum control for probing anisotropic forces.

Area of Science:

Chemical Physics
Quantum Mechanics
Molecular Dynamics

Background:

Scattering experiments yield information proportional to the precision of quantum state definition.
Precisely defined incoming and outgoing states in scattering experiments enable experimental solutions to the Schrödinger equation.

Purpose of the Study:

To discuss cold inelastic scattering experiments using hydrogen molecule (H2) and its isotopologues.
To demonstrate how Stark-induced adiabatic Raman passage (SARP) prepares precisely defined quantum states for scattering.
To explore quantum-scale stereodynamic control of anisotropic interactions.

Main Methods:

Utilizing Stark-induced adiabatic Raman passage (SARP) to prepare H2 targets in specific rovibrational (v, j, m) quantum states.
Employing mixed supersonic beams, collimated for directed collision velocities, to achieve low collision temperatures (few Kelvin).

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Coherently controlling molecular alignment with respect to collision velocity for stereodynamic control.

Main Results:

SARP enables coherent control of anisotropic interactions by preparing quantum superpositions of orientational (m) states within a single rovibrational (v, j) state.
Cold scattering experiments reveal the dominance of a resonant orbital in scattering angular distributions.
Highly controlled experiments at the single partial wave limit facilitate direct comparison with theoretical computations.

Conclusions:

Precisely controlled cold collision experiments are crucial for accurate molecular interaction potential modeling.
SARP offers a powerful technique for quantum-state-resolved scattering studies.
These studies advance the understanding of fundamental molecular interactions and quantum dynamics.