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Updated: May 23, 2025

Exploring the Radical Nature of a Carbon Surface by Electron Paramagnetic Resonance and a Calibrated Gas Flow
Published on: April 24, 2014
Empirical rovibronic energy levels of C3
1Department of Physics and Astronomy, University College London, London, UK.
Abstract:
The carbon trimer, also known as propadienediylidene, is a quasi-linear molecule with an unusual electronic structure and a very flat bending potential in its ground electronic state. is an important species in astrophysics and carbon plasmas. Observed transition wavenumbers within and between the and states of are extracted from 21 papers and then subjected to a Measured Active Rotational-Vibrational Energy Levels (MARVEL) analysis: a corrected list of 4940 transitions are inverted to yield 1887 empirical energy levels. Uncertainties for these levels are determined using a newly implemented bootstrap method. These levels will provide input for developing a full spectroscopic model for which can used to generate a line list for the and states.
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