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Related Experiment Video

Updated: Jul 20, 2026

Iridium(III) Luminescent Probe for Detection of the Malarial Protein Biomarker Histidine Rich Protein-II

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Detection of H3+ in interstellar space

T R Geballe¹, T Oka

¹Joint Astronomy Centre, University Park, Hilo, Hawaii 96720, USA. tom@jach.hawaii.edu

|November 28, 1996

Summary

The detection of the trihydrogen cation (H3+) in interstellar molecular clouds is reported, confirming its role in initiating complex interstellar chemistry. This finding is crucial for understanding the chemical evolution of the universe.

Area of Science:

Astrochemistry
Interstellar Medium
Molecular Clouds

Background:

The trihydrogen cation (H3+) is theorized to be a key initiator of interstellar chemical reactions.
Previous attempts to detect H3+ in interstellar space have been unsuccessful.
The infrared spectrum of H3+ was measured in the laboratory in 1980.

Purpose of the Study:

To report the first successful detection of H3+ in interstellar molecular clouds.
To confirm the presence and significance of H3+ in driving interstellar chemistry.

Main Methods:

Absorption spectroscopy
Analysis of spectra from two molecular clouds.

Main Results:

Detection of H3+ absorption in the spectra of two molecular clouds.

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Evidence suggests H3+ is present in sufficient quantities to drive significant interstellar chemistry.

Accurate abundance determination is not yet possible.

Conclusions:

The detection of H3+ validates its proposed role in interstellar chemistry.
Further measurements will allow for better quantification of H3+'s impact on molecular cloud chemical evolution.
Ion-neutral reactions are critical for understanding chemical evolution in molecular clouds.