NEAR-INFRARED SPECTROSCOPY OF DISSOCIATED NAPHTHALENE IN A RADIOFREQUENCY PLASMA

Lecomte, Julien

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Description

Title

NEAR-INFRARED SPECTROSCOPY OF DISSOCIATED NAPHTHALENE IN A RADIOFREQUENCY PLASMA

Author(s)

Lecomte, Julien

Contributor(s)

• Georges, Robert
• Rutkowski, Lucile
• Kassi, Samir
• Dudás, Eszter
• Boswell, Rod W
• Charles, Christine
• Suas-David, Nicolas

Issue Date

2023-06-21

Keyword(s)

Mini-symposium: Infrared Spectroscopy in the JWST Era

Abstract

Polycyclic aromatic hydrocarbons (PAHs) are abundant organic molecules detected in several objects in the universe, such as molecular clouds in the interstellar medium (ISM)ᵃ. Their structure can be modified through plasma-driven processes occurring in the ISM. The present study focuses on the dissociation of naphthalene (C₁₀H₈) in a radiofrequency (RF) plasma, probed using cavity ringdown spectroscopy (CRDS) in the near-infrared. Namely, the low-power RF plasma source, called Platypus, is adapted from a small plasma thruster (“Pocket Rocket”) designed by the Space Plasma Power and Propulsion laboratory of the ANUᵇ. A stable supersonic jet plasma is generated by expanding a mixture of argon and dissociated C₁₀H₈ into a vacuum chamber through a 20 mm long, 4 mm wide slit nozzleᶜ. The jet-cooled fragmented C₁₀H₈ is finally probed with the ultra-sensitive CRDS technique. We recorded a spectrum from 5950 to 6120 cm⁻¹ composed of several hundred transitions originating from many different molecules, radicals, and probably ionsᵈ.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Handle URL

https://hdl.handle.net/2142/122491

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