Chemistry

Observation of spontaneous N-bearing PAH formation using ion trap: a new formation pathway in the interstellar medium

Siddhartha S. Payra, Pratikkumar Thakkar, Shiv Gupta, Ruth Ann Mathews, Yash Lenka, Saurav Dutta, Nihar Ranjan Behera, Krishna R. Nandipati, G. Aravind

Featured May 18, 2026

Original Paper

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Simply

Scientists discovered a new way that tiny charged molecules called pyrimidine ions can easily combine with acetylene gas in space, building bigger, complex nitrogen-containing ring structures that are important for understanding how life's building blocks form in cosmic clouds and on planets like Titan.

In depth

The study experimentally identifies and characterizes a novel ion-molecule reaction pathway for forming nitrogen-bearing polycyclic aromatic hydrocarbons (N-PAHs) from pyrimidine cations and acetylene. Using a 22-pole ion trap and electronic structure calculations, the authors demonstrate that these reactions proceed efficiently and exothermically, leading to a previously unreported bicyclic endocyclic N-PAH. This mechanism offers crucial insights into the chemical evolution of complex organic molecules in environments like the interstellar medium and Titan's atmosphere.

Key Takeaways

1
A novel reaction pathway for N-PAH formation from pyrimidine cations and acetylene is experimentally identified and characterized under astrophysically relevant conditions.
2
The formation of a bicyclic endocyclic N-PAH ( $C_{8} H_{7} N_{2}^{+}$ ) is confirmed to be an efficient and exothermic process, providing a new candidate for astronomical searches.
3
The presence of double nitrogen substitution in pyrimidine significantly enhances its reactivity with acetylene, contributing to the growth of larger N-PAHs in cosmic environments.

Conceptual Flow

HIGH LEVEL

Simulating Space Chemistry

Scientists put charged molecules and gas into a special container to see how they react, just like in space, then used computers to understand the molecule shapes.

Space Molecules

Gas

Mix in Trap

New Molecules

Reaction Speed

Building Bigger Space Molecules

They found that small nitrogen-containing rings can easily grow into larger, more complex ring structures, which helps explain mysterious signals from space.

Small Nitrogen Ring

Acetylene Gas

Combine Easily

Larger Nitrogen Ring