THE BENDING OF C₃: EXPERIMENTALLY PROBING THE l-TYPE DOUBLING AND RESONANCE

Martin-Drumel, Marie-Aline

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Description

Title

THE BENDING OF C₃: EXPERIMENTALLY PROBING THE l-TYPE DOUBLING AND RESONANCE

Author(s)

Martin-Drumel, Marie-Aline

Contributor(s)

• Zhao, Dongfeng
• Chen, Yang
• Zhang, Qiang
• Linnartz, Harold
• Doney, Kirstin D
• Western, Colin
• Tokaryk, Dennis W.
• Vervloet, Michel
• Pirali, Olivier

Issue Date

2023-06-20

Keyword(s)

Mini-symposium: Infrared Spectroscopy in the JWST Era

Abstract

C₃, a pure carbon chain molecule that has been identified in different astronomical environments, is considered a good probe of kinetic temperatures through observation of transitions involving its low-lying bending mode (ν₂) in its ground electronic state. With the aim to investigate this bending mode with multiple quanta of excitation, we have undertaken high resolution optical and mid-infrared investigations on the species produced in discharge experiments. We report here the most complete analysis of the X˜ and A˜ states of C₃ (literature and present study) using a single PGOPHER file. New experimental measurements, reported in the past years at ISMS, result in 36 rovibronic A˜ 1Πu − X˜ 1Σ⁺ bands (originating from X˜(0v₂0), v₂ = 0 − 5, levels) recorded by laser induced fluorescence spectroscopy at the University of Science and Technology of China and the rovibrational ν₃ band (revealing hot bands involving up to 5 quanta of excitation in ν₂) recorded by Fourier-transform infrared spectroscopy using a globar source on the AILES beamline of the SOLEIL synchrotron facility. The combined fit allows for the accurate determination of the rotational parameters and absolute energy levels of C₃, in particular for states involving the bending mode. The spectroscopic information derived from this work enables new interstellar searches for C₃, not only in the infrared and optical regions investigated here but also notably in the ν₂ band region (around 63 cm⁻¹) where vibrational satellites can now be accurately predicted. This makes C₃ a universal diagnostic tool to study very different astronomical environments, from dark and dense to translucent clouds.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Handle URL

https://hdl.handle.net/2142/122317

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