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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Coincidence ion imaging with a fast frame camera.

Suk Kyoung Lee¹, Fadia Cudry¹, Yun Fei Lin¹

¹Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA.

The Review of Scientific Instruments

|January 3, 2015

Summary

This summary is machine-generated.

A novel particle detection system uses a fast CMOS camera and photomultiplier tube for precise ion imaging. This system achieves multi-hit capability, enabling detailed analysis of molecular dissociation dynamics.

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Area of Science:

Atomic, Molecular, and Chemical Physics
Instrumentation and Measurement Science

Background:

Coincidence ion imaging requires precise time and position detection of particles.
Existing systems may have limitations in speed, multi-hit capability, or data processing.
Advancements in detector technology are crucial for detailed studies of molecular dynamics.

Purpose of the Study:

To develop and demonstrate a new time- and position-sensitive particle detection system.
To enable high-resolution coincidence ion imaging with multi-hit capability.
To analyze molecular dissociation dynamics, such as in strong field ionization.

Main Methods:

Integration of a fast frame complementary metal-oxide semiconductors (CMOS) camera with a microchannel plate/phosphor screen ion imager.
Incorporation of a single anode photomultiplier tube (PMT) and a high-speed digitizer for timing information.
Development of real-time centroiding algorithms for positional data and correlation techniques for multi-hit detection.

Main Results:

The system successfully captures both positional (via CMOS camera) and timing (via PMT) information of ions.
Multi-hit capability was achieved by correlating camera frame intensity with PMT time-of-flight spectra.
Demonstrated system performance by detecting momentum-matched co-fragment ions from methyl iodide dissociation.

Conclusions:

The developed system provides a robust platform for time- and position-sensitive coincidence ion imaging.
Efficient real-time data processing at a 1 kHz laser repetition rate is achieved.
The system is effective for studying complex dissociation events, like those from strong field ionization.