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Quantum-state-dependent decay rates of electrostatically trapped Rydberg NO molecules.

M H Rayment1, S D Hogan1

  • 1Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK. s.hogan@ucl.ac.uk.

Physical Chemistry Chemical Physics : PCCP
|October 6, 2021
PubMed
Summary

Researchers prepared nitric oxide (NO) molecules in long-lived Rydberg-Stark states and decelerated them to rest. They observed decay rates influenced by intramolecular interactions, offering insights into Rydberg state dynamics.

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Area of Science:

  • Physical Chemistry
  • Molecular Physics
  • Quantum Mechanics

Background:

  • Nitric oxide (NO) molecules are crucial in various chemical and physical processes.
  • Understanding the behavior of molecules in excited states is fundamental to molecular physics.
  • Long-lived Rydberg states offer a unique platform for studying molecular interactions and dynamics.

Purpose of the Study:

  • To prepare nitric oxide (NO) molecules in long-lived Rydberg-Stark states.
  • To decelerate these excited NO molecules to rest using a transmission-line Rydberg-Stark decelerator.
  • To investigate the decay dynamics of these trapped Rydberg states and identify factors influencing their lifetimes.

Main Methods:

  • Resonance-enhanced two-colour two-photon excitation was used to prepare NO in Rydberg-Stark states.
  • A transmission-line Rydberg-Stark decelerator operated at 30 K was employed to slow down and trap the molecules.
  • In situ detection via pulsed electric field ionization and measurements of decay rates were performed for principal quantum numbers n = 32–50.

Main Results:

  • NO molecules were successfully prepared in long-lived Rydberg-Stark states and decelerated to rest.
  • Measured decay times ranged from 200 μs to 400 μs, generally decreasing with increasing principal quantum number (n).
  • Deviations from the general trend were observed, attributed to rotational and vibrational channel interactions influencing decay rates.

Conclusions:

  • Weak intramolecular interactions, specifically rotational and vibrational channel interactions, play a significant role in the slow decay of long-lived Rydberg states in NO.
  • The study provides new insights into the complex dynamics governing the stability and decay of excited molecular states.
  • These findings contribute to a deeper understanding of quantum phenomena in molecular systems.