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Title: VUV Photoionization Study of the Formation of the Simplest Polycyclic Aromatic Hydrocarbon: Naphthalene (C10H8)

Journal Article · · Journal of Physical Chemistry Letters
 [1]; ORCiD logo [1]; ORCiD logo [2];  [2];  [2];  [3];  [3];  [4]; ORCiD logo [4]; ORCiD logo [5]
  1. Univ. of Hawaii at Manoa, Honolulu, HI (United States). Dept. of Chemistry
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Div.
  3. Samara National Research Univ., Samara (Russian Federation); Lebedev Physical Institute, Samara (Russian Federation)
  4. Florida International Univ., Miami, FL (United States). Dept of Chemistry and Biochemistry
  5. Florida International Univ., Miami, FL (United States). Dept of Chemistry and Biochemistry; Samara National Research Univ., Samara (Russian Federation)

The formation of the simplest polycyclic aromatic hydrocarbon (PAH), naphthalene (C10H8), was explored in a high-temperature chemical reactor under combustion-like conditions in the phenyl (C6H5)-vinylacetylene (C4H4) system. The products were probed utilizing tunable vacuum ultraviolet light by scanning the photoionization efficiency (PIE) curve at a mass-to-charge m/z = 128 (C10H8+) of molecules entrained in a molecular beam. The data fitting with PIE reference curves of naphthalene, 4-phenylvinylacetylene (C6H5CCC2H3), and trans-1-phenylvinylacetylene (C6H5CHCHCCH) indicates that the isomers were generated with branching ratios of 43.5±9.0: 6.5±1.0: 50.0±10.0%. Kinetics simulations agree nicely with the experimental findings with naphthalene synthesized via the hydrogen abstraction-vinylacetylene addition (HAVA) pathway and through hydrogen-assisted isomerization of phenylvinylacetylenes. In conclusion, the HAVA route to naphthalene at elevated temperatures represents an alternative pathway to the hydrogen abstraction-acetylene addition (HACA) forming naphthalene in flames and circumstellar envelopes, whereas in cold molecular clouds, HAVA synthesizes naphthalene via a barrierless bimolecular route.

Research Organization:
Univ. of Hawaii at Manoa, Honolulu, HI (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-03ER15411; AC02-05CH11231
OSTI ID:
1603087
Alternate ID(s):
OSTI ID: 1459406
Journal Information:
Journal of Physical Chemistry Letters, Vol. 9, Issue 10; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 49 works
Citation information provided by
Web of Science

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Cited By (6)

Gas phase synthesis of [4]-helicene journal April 2019
Synthesis of Polycyclic Aromatic Hydrocarbons by Phenyl Addition-Dehydrocyclization: The Third Way journal October 2019
From atoms to aerosols: probing clusters and nanoparticles with synchrotron based mass spectrometry and X-ray spectroscopy journal January 2020
Synthesis of Polycyclic Aromatic Hydrocarbons by Phenyl Addition–Dehydrocyclization: The Third Way journal November 2019
Molecular mass growth through ring expansion in polycyclic aromatic hydrocarbons via radical–radical reactions journal August 2019
Reactivity of the Indenyl Radical (C 9 H 7 ) with Acetylene (C 2 H 2 ) and Vinylacetylene (C 4 H 4 ) journal April 2019

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