DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Infrared bands of neutral gas-phase carbon clusters in a broad spectral range

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI: https://doi.org/10.1039/d3cp05756a · OSTI ID:2470920
ORCiD logo [1];  [2];  [1]
  1. Radboud University, Nijmegen (Netherlands)
  2. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

The identification of species in the interstellar medium requires precise and molecule-specific spectroscopic information in the laboratory framework, in broad spectral ranges and under conditions relevant to interstellar environments. In this work, we measure the gas-phase infrared spectra of neutral carbon clusters, CN (N = 6–11), in a molecular beam. The CN distribution is formed by photofragmentation of C60 molecules, concurrently showing a top-down formation mechanism. A broad spectral range in the infrared between 500–3200 cm-1 (20–3.125 μm) is investigated. We observe strong bands between 5 and 6 μm, in conjunction with novel features in the 3 μm region. Density functional theory calculations reveal that these short wavelength modes correspond to combination bands with significant infrared intensity. Moreover, we identify the N ≤ 10 clusters as linear, while C11 adopts a ring configuration, placing the linear-to-ring transition at N = 11 under our molecular beam conditions. The linearity of C10 is discussed based on the formation pathway from larger clusters in energetic conditions. Given the vast and very precise infrared information already been released from the James Webb Space Telescope mission, this infrared spectroscopic data set in conjunction with information on formation mechanisms is of major relevance for identifying neutral carbon clusters in astronomical environments.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2470920
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 16 Vol. 26; ISSN 1463-9076
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

References (45)

Three structural types of carbon cluster anions and the magic numbers journal May 1993
The electronic and molecular structure of carbon clusters: C8 and C10 journal January 1992
Infrared bands of mass-selected carbon chains Cn (n = 8−12) and Cn− (n = 5−10, 12) in neon matrices journal April 1997
The Cologne Carbon Cluster Experiment: ro-vibrational spectroscopy on C8 and other small carbon clusters journal February 2003
Isomer-resolved dissociation of small carbon cluster cations, C7+–C10+ journal January 2012
Possible lower energy isomer of carbon clusters C (n = 11, 12) via particle swarm optimization algorithm: Ab initio investigation journal April 2019
Nudged Elastic Band Method for Molecular Reactions Using Energy-Weighted Springs Combined with Eigenvector Following journal July 2021
Energy Landscapes of Carbon Clusters from Tight-Binding Quantum Potentials journal April 2022
Far-IR Absorption of Neutral Polycyclic Aromatic Hydrocarbons (PAHs): Light on the Mechanism of IR–UV Ion Dip Spectroscopy journal October 2020
Photofragment Imaging of Carbon Cluster Cations: Explosive Ring Rupture journal May 2022
Ionization Thresholds of Small Carbon Clusters:  Tunable VUV Experiments and Theory journal July 2007
Ab Initio Characterization of C6 journal May 2009
Laboratory confirmation of C60+ as the carrier of two diffuse interstellar bands journal July 2015
Open questions on carbon-based molecules in space journal August 2022
The rich 6 to 9 $\vec\mu$m spectrum of interstellar PAHs journal August 2002
High resolution infrared spectra of the linear carbon cluster C7: The ν4 stretching fundamental band and associated hot bands journal July 2007
Carbon clusters: The structure of C1 studied with configuration interaction methods journal December 1990
Structures of carbon cluster ions from 3 to 60 atoms: Linears to rings to fullerenes journal September 1991
Fourier transform infrared isotopic study of the ν4 and ν5 stretching modes of linear C6 in Ar at 10 K journal January 1993
Infrared laser spectroscopy of jet-cooled carbon clusters: The bending dynamics of linear C9 journal May 1993
Fourier transform infrared observation of the ν7 stretching mode of linear C9 in Ar at 10 K journal October 1995
Infrared laser spectroscopy of jet-cooled carbon clusters: The ν5 band of linear C9 journal October 1996
Use of density functional theory method to calculate structures of neutral carbon clusters Cn (3 ≤ n ≤ 24) and study their variability of structural forms journal February 2015
Formation of buckminsterfullerene (C60) in interstellar space journal December 2011
Infrared laser spectroscopy of jet-cooled carbon clusters: Structure of triplet C 6 journal July 1993
Radiative cooling of size-selected gas phase clusters journal October 2019
Detection of C2 in the interstellar spectrum of Cygnus OB2 number 12 /VI Cygni number 12/ journal August 1977
Knockout driven reactions in complex molecules and their clusters journal August 2016
Thermal radiative cooling of carbon cluster cations CN+, N = 9, 11, 12, 17–27 journal May 2022
Electronic and vibrational radiative cooling of the small carbon clusters C4− and C6− journal December 2018
Infrared Action Spectroscopy of Low-Temperature Neutral Gas-Phase Molecules of Arbitrary Structure journal September 2016
Growth regimes of carbon clusters journal October 1991
Fragmentation of Highly Excited Small Neutral Carbon Clusters journal August 2004
The C 7 Cluster: Structure and Infrared Frequencies journal August 1990
Infrared Laser Spectroscopy of the Linear C 13 Carbon Cluster journal August 1994
Diode-Laser Absorption Spectroscopy of Supersonic Carbon Cluster Beams: the ν 3 Spectrum of C 5 journal May 1989
Detection of C60 and C70 in a Young Planetary Nebula journal July 2010
Detection of C 3 in the Circumstellar Shell of IRC+10216 journal September 1988
Detection of C5 in the Circumstellar Shell of IRC+10216 journal May 1989
Detection of two interstellar polycyclic aromatic hydrocarbons via spectral matched filtering journal March 2021
Interstellar Polycyclic Aromatic Hydrocarbon Molecules journal September 2008
2021 Census of Interstellar, Circumstellar, Extragalactic, Protoplanetary Disk, and Exoplanetary Molecules journal March 2022
GOALS-JWST: Hidden Star Formation and Extended PAH Emission in the Luminous Infrared Galaxy VV 114 journal November 2022
GOALS-JWST: Tracing AGN Feedback on the Star-forming Interstellar Medium in NGC 7469 journal December 2022
GOALS-JWST: Mid-infrared Spectroscopy of the Nucleus of NGC 7469 journal January 2023