University of Illinois Urbana-Champaign

Development Of Structural Complexity In Bare And Hydrogenated Carbon Clusters

Bieske, Evan

Content Files
WA04_1.pptx
6282.pdf

Permalink

https://hdl.handle.net/2142/116749

Description

Title
Development Of Structural Complexity In Bare And Hydrogenated Carbon Clusters
Author(s)
Bieske, Evan
Contributor(s)
  • Watkins, Patrick
  • Liu, Chang
  • Buntine, Jack T.
  • Marlton, Samuel Jack Palmer
Issue Date
2022-06-22
Keyword(s)
Mini-symposium: Spectroscopy meets Chemical Dynamics
Abstract
The importance of bare and hydrogenated carbon clusters in combustion and in the chemistry of interstellar space has motivated numerous spectroscopic studies, most of which have focused on smaller neutral and charged clusters with fewer than 10 carbon atoms and on the \ce{C60} and \ce{C70} fullerenes. Recently, we have obtained electronic spectra of bare and hydrogenated carbon cation clusters containing between up to 36 carbon atoms. Spectroscopically interrogating carbonaceous molecules containing more than 10 carbon atoms is complicated by the coexistence of different isomers possessing unique spectroscopic properties. To address this issue, we have developed an apparatus that allows formation and selection by ion mobility of a particular \ce{C_xH_y+} isomer population, which is incarcerated in a cryogenically cooled ion trap and subjected to tunable radiation. Resonant excitation of an electronic transition leads to cluster fragmentation, which when monitored as a function of wavelength, yields an action spectrum. We have used this approach to obtain electronic spectra for monocyclic \ce{C_n+} clusters with 12$\leq n \leq$36, which exhibit sharp transitions that progressively shift to longer wavelength with increasing cluster size. We have also probed \ce{C_nH+} clusters, which are shown to exist as linear and cyclic isomers with distinct electronic spectra. Linear isomers (7$\leq n \leq$ 17), feature sharp, intense absorptions across the UV and visible range, whereas cyclic isomers ($n\geq$15) have much weaker, and broader absorptions. Addition of more hydrogen atoms precipitates formation of bi-cyclic structures that may be precursors of polycyclic aromatic hydrocarbons.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
text
Genre of Resource
Conference Paper / Presentation
Language
eng
Handle URL
https://hdl.handle.net/2142/116749
DOI
https://doi.org/10.15278/isms.2022.WA04
Copyright and License Information
Copyright 2022 held by the authors

Owning Collections

Abstracts & Presentations - 2022 International Symposium on Molecular Spectroscopy PRIMARY