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Laser induced alignment of state-selected CH3I.

Lanhai He¹, Jaap Bulthuis, Sizuo Luo

¹Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, P. R. China. dajund@jlu.edu.cn.

Physical Chemistry Chemical Physics : PCCP

|August 29, 2015

Summary

This study uses laser alignment to control methyl iodide (CH3I) molecular orientation. Researchers precisely measured molecular alignment using velocity map imaging, enabling 3D distribution reconstruction.

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Area of Science:

Molecular Physics
Laser Spectroscopy
Quantum Chemistry

Background:

Hexapole state selection is crucial for preparing specific molecular states.
Laser-induced molecular alignment offers control over molecular orientation.
Time-of-flight mass spectrometry is a standard technique for ion analysis.

Purpose of the Study:

To prepare specific quantum states of CH3I molecules using hexapole state selection.
To align CH3I molecules in a strong laser field and ionize them with a probe pulse.
To reconstruct the 3D ion distribution using the inverse Abel transformation and analyze molecular alignment parameters.

Main Methods:

Hexapole state selection for CH3I molecule preparation.
Alignment of CH3I molecules in an 800 nm linearly polarized laser field.
Ionization using a time-delayed probe laser pulse.
Velocity map imaging and inverse Abel transformation for 3D distribution reconstruction.

Main Results:

Achieved controllable molecular alignment with extreme values of = 0.7 (aligned) and -0.1 (anti-aligned).
Determined values between 0.3 and 0.0.
Demonstrated the feasibility of reconstructing 3D ion distributions from projected images.

Conclusions:

The developed method allows for precise control and measurement of molecular alignment.
Velocity map imaging combined with inverse Abel transformation is effective for 3D molecular distribution analysis.
This technique provides valuable insights into laser-matter interactions and molecular dynamics.