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Anharmonicity and the infrared emission spectrum of highly excited polycyclic aromatic hydrocarbons

Journal Article · · Astronomy and Astrophysics
 [1];  [2];  [2];  [3];  [2]
  1. Leiden Univ. (Netherlands); KTH Royal Inst. of Technology, Stockholm (Sweden)
  2. Leiden Univ. (Netherlands)
  3. NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States)

Infrared (IR) spectroscopy is a powerful tool to study molecules in space. A key issue in such analyses is understanding the effect that temperature and anharmonicity have on different vibrational bands, and thus interpreting the IR spectra for molecules under various conditions. We combined second order vibrational perturbation theory and the Wang-Landau random walk technique to produce accurate IR spectra of highly excited polycyclic aromatic hydrocarbons. We fully incorporated anharmonic effects, such as resonances, overtones, combination bands, and temperature effects. The results are validated against experimental results for the pyrene molecule (C16H10). Finally, in terms of positions, widths, and relative intensities of the vibrational bands, our calculated spectra are in excellent agreement with gas-phase experimental data.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); European Union (EU); NWO; Swedish Research Council; National Aeronautic and Space Administration (NASA)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1616065
Journal Information:
Astronomy and Astrophysics, Journal Name: Astronomy and Astrophysics Vol. 618; ISSN 0004-6361
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Temperature effects on anharmonic infrared spectra of large compact polycyclic aromatic hydrocarbons journal February 2019
The infrared bands of polycyclic aromatic hydrocarbons in the 1.6–1.7 μ m wavelength region journal December 2019
Structural and physicochemical properties of freeze-dried açaí pulp (Euterpe oleracea Mart.)
  • Oliveira, Aryane Ribeiro; Ribeiro, Alline Emannuele Chaves; Oliveira, Érica Resende
  • Food Science and Technology, Vol. 40, Issue 2 https://doi.org/10.1590/fst.34818
journal June 2020

Figures / Tables (4)


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