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