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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Quantum Controlled Cold Scattering Challenges Theory.

William E Perreault¹, Haowen Zhou¹, Nandini Mukherjee¹

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

The Journal of Physical Chemistry Letters

|November 17, 2022

Summary

This summary is machine-generated.

New experiments on molecular hydrogen (HD) and helium collisions reveal discrepancies with theoretical models. The study highlights potential inaccuracies in the weaker anisotropic components of the hydrogen-helium interaction potential.

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Area of Science:

Chemical Physics
Molecular Dynamics
Quantum Scattering

Background:

Previous experiments on D2-He collisions showed discrepancies with theoretical predictions.
Accurate understanding of anisotropic potentials is crucial for molecular interactions.

Purpose of the Study:

Investigate rotational relaxation of HD by He collisions.
Probe different anisotropic components of the van der Waals potential.
Resolve theoretical-experimental discrepancies in H2-He interactions.

Main Methods:

State-resolved cold scattering experiments.
Studied rotational transitions (Δj=1 and Δj=2) of HD (v=2, j=2, m=0) colliding with He.
Analyzed scattering dynamics mediated by shape resonances (l=1 and l=2).

Main Results:

The Δj=1 transition, dominated by the l=1 resonance, agrees with theoretical calculations.
The Δj=2 transition, dominated by the weaker l=2 resonance, contradicts theoretical predictions.
Experimental results for HD-He align with prior D2-He findings, indicating a consistent issue.

Conclusions:

Theoretical models may inaccurately represent the weaker anisotropic parts of the H2-He interaction potential.
Further refinement of theoretical calculations is needed to match experimental observations.
Stereodynamically controlled scattering experiments provide critical validation for theoretical models.