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Related Experiment Video

Updated: Jul 19, 2026

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C₂, CN, and TiO Spectra Following Laser-induced Optical Breakdown

Published on: February 14, 2014

CH5+: the infrared spectrum observed

White¹, Tang, Oka

¹Department of Chemistry, Department of Astronomy and Astrophysics, and the Enrico Fermi Institute, University of Chicago, Chicago, IL 60637, USA.

Science (New York, N.Y.)

|April 2, 1999

Summary

Protonated methane (CH5+) exhibits unique behavior due to its unstable structure and mobile protons. This study reports its complex infrared spectrum, providing crucial spectral data for understanding this ion.

Area of Science:

Physical Chemistry
Spectroscopy
Quantum Mechanics

Background:

Protonated methane (CH5+) displays anomalous vibrational and rotational characteristics.
Its unique properties stem from nearly degenerate equilibrium structures and rapid proton scrambling.
Existing theoretical studies highlight the need for experimental spectral data.

Purpose of the Study:

To obtain high-resolution infrared spectral data for protonated methane (CH5+).
To investigate the C-H stretching band in the 3.4-micrometer region.
To provide experimental evidence for the spectral signature of CH5+.

Main Methods:

Acquisition of a complex, high-resolution infrared spectrum.
Focus on the spectral region associated with C-H stretching vibrations.

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Comparative analysis with spectra of other carbocations.

Main Results:

A detailed infrared spectrum of CH5+ was successfully recorded.
The spectrum covers the characteristic 3.4-micrometer C-H stretching absorption band.
Observed spectral features are consistent with the presence of CH5+.

Conclusions:

The reported infrared spectrum provides essential experimental data for protonated methane.
While individual line assignments were not made, the overall spectrum strongly suggests CH5+.
This spectral data will aid in a deeper understanding of CH5+ quantum mechanics and behavior.