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Related Experiment Video

Updated: Jun 17, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

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Optical lifetime measurements using a positive ion van de graaff accelerator.

L L Nichols, W E Wilson

|January 12, 2010

Summary

This study presents a new system for measuring excited state optical mean lives using delayed coincidence counting. The developed technique allows for precise measurements of mean lives exceeding 1 nanosecond.

Area of Science:

Atomic and Molecular Physics
Spectroscopy
Quantum Optics

Background:

Accurate measurement of excited state optical mean lives is crucial for understanding atomic and molecular processes.
Existing techniques may have limitations in precision or the range of measurable lifetimes.

Purpose of the Study:

To develop and demonstrate a novel system for the direct observation of excited state optical mean lives.
To establish a reliable method for measuring mean lives longer than 1 nanosecond.

Main Methods:

Utilized a pulsed proton beam for excitation of atomic and molecular species.
Employed the delayed coincidence counting technique for high-resolution lifetime measurements.
Integrated a high-speed time-to-amplitude converter and an on-line digital computer for efficient data reduction.

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Last Updated: Jun 17, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

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Published on: August 6, 2018

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Main Results:

Successfully measured excited state optical mean lives exceeding 1 nanosecond.
Presented preliminary measurements for specific levels in Helium (3(1)p, 4(3)S, 4(1)D) and vibrational bands of Nitrogen (N2).
Demonstrated the system's capability to accurately characterize optical mean lives.

Conclusions:

The developed system provides a robust and effective method for determining excited state optical mean lives.
The preliminary measurements validate the system's performance and potential for broader applications in atomic and molecular physics research.