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Rodriguez L, Natalizio M, Sode O. Theoretical Insights into the Vibrational Structure of Carbon Dioxide Rare-Gas Complexes. J Phys Chem A 2024; 128:4199-4205. [PMID: 38770817 DOI: 10.1021/acs.jpca.4c00639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2024]
Abstract
Two new flexible-monomer two-body ab initio potential energy surfaces (PESs) for the neon and krypton van der Waals complexes with carbon dioxide were developed, extending our previous work on the Ar-CO2 molecule. The accuracy of the PESs was validated by their agreement with the vibrational spectrum of the rare-gas complexes. The intermolecular and intramolecular vibrational excitation energies were computed at the vibrational self-consistent field and vibrational configuration interaction levels of theory. Overall, the agreement between theory and experiment is excellent throughout the vibrational spectra. The observed slight splitting of the bending modes, resulting from their nondegeneracy in the complexes, is confirmed by our computations, and the results qualitatively agree with the experiment. The splitting increases with increasing polarizability of the rare-gas atom. Additionally, we explain a discrepancy in the mode assignment in the intermolecular region of the neon complex with our VCI character assignment.
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Affiliation(s)
- Larry Rodriguez
- Department of Chemistry and Biochemistry, California State University, Los Angeles, 5151 State University Drive, Los Angeles, California 90032, United States
| | - Michael Natalizio
- Department of Chemistry and Biochemistry, California State University, Los Angeles, 5151 State University Drive, Los Angeles, California 90032, United States
| | - Olaseni Sode
- Department of Chemistry and Biochemistry, California State University, Los Angeles, 5151 State University Drive, Los Angeles, California 90032, United States
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Dinu DF, Bartl P, Quoika PK, Podewitz M, Liedl KR, Grothe H, Loerting T. Increase of Radiative Forcing through Midinfrared Absorption by Stable CO 2 Dimers? J Phys Chem A 2022; 126:2966-2975. [PMID: 35533210 PMCID: PMC9125687 DOI: 10.1021/acs.jpca.2c00857] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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We performed matrix-isolation
infrared (MI-IR) spectroscopy of
carbon dioxide monomers, CO2, and dimers, (CO2)2, trapped in neon and in air. On the basis of vibration
configuration interaction (VCI) calculations accounting for mode coupling
and anharmonicity, we identify additional infrared-active bands in
the MI-IR spectra due to the (CO2)2 dimer. These
bands are satellite bands next to the established CO2 monomer
bands, which appear in the infrared window of Earth’s atmosphere
at around 4 and 15 μm. In a systematic carbon dioxide mixing
ratio study using neon matrixes, we observe a significant fraction
of the dimer at mixing ratios above 300 ppm, with a steep increase
up to 1000 ppm. In neon matrix, the dimer increases the IR absorbance
by about 15% at 400 ppm compared to the monomer absorbance alone.
This suggests a high fraction of the (CO2)2 dimer
in our matrix experiments. In atmospheric conditions, such increased
absorbance would significantly amplify radiative forcings and, thus,
the greenhouse warming. To enable a comparison of our laboratory experiment
with various atmospheric conditions (Earth, Mars, Venus), we compute
the thermodynamics of the dimerization accordingly. The dimerization
is favored at low temperatures and/or high carbon dioxide partial
pressures. Thus, we argue that matrix isolation does not trap the
gas composition “as is”. Instead, the gas is precooled
to 40 K, where CO2 dimerizes before being trapped in the
matrix, already at very low carbon dioxide partial pressures. In the
context of planetary atmospheres, our results improve understanding
of the greenhouse effect for planets of rather thick CO2 atmospheres such as Venus, where a significant fraction of the (CO2)2 dimer can be expected. There, the necessity
of including the mid-IR absorption by stable (CO2)2 dimers in databases used for modeling radiative forcing,
such as HITRAN, arises.
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Affiliation(s)
- Dennis F Dinu
- Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, A-6020 Innsbruck, Austria.,Institute of Physical Chemistry, University of Innsbruck, A-6020 Innsbruck, Austria.,Institute of Materials Chemistry, Technische Universität Wien, A-1060 Vienna, Austria
| | - Pit Bartl
- Institute of Physical Chemistry, University of Innsbruck, A-6020 Innsbruck, Austria
| | - Patrick K Quoika
- Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, A-6020 Innsbruck, Austria
| | - Maren Podewitz
- Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, A-6020 Innsbruck, Austria.,Institute of Materials Chemistry, Technische Universität Wien, A-1060 Vienna, Austria
| | - Klaus R Liedl
- Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, A-6020 Innsbruck, Austria
| | - Hinrich Grothe
- Institute of Materials Chemistry, Technische Universität Wien, A-1060 Vienna, Austria
| | - Thomas Loerting
- Institute of Physical Chemistry, University of Innsbruck, A-6020 Innsbruck, Austria
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Ruiz J, Misa K, Seshappan A, Keçeli M, Sode O. Exploring the anharmonic vibrational structure of carbon dioxide trimers. J Chem Phys 2021; 154:144302. [PMID: 33858169 DOI: 10.1063/5.0039793] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Our previously developed mbCO2 potential [O. Sode and J. N. Cherry, J. Comput. Chem. 38, 2763 (2017)] is used to describe the vibrational structure of the intermolecular motions of the CO2 trimers: barrel-shaped and cyclic trimers. Anharmonic corrections are accounted for using the vibrational self-consistent field theory, vibrational second-order Møller-Plesset perturbation (VMP2) theory, and vibrational configuration interaction (VCI) methods and compared with experimental observations. For the cyclic structure, we revise the assignments of two previously observed experimental peaks based on our VCI and VMP2 results. We note that the experimental band observed near 13 cm-1 is the out-of-phase out-of-plane degenerate motion with E″ symmetry, while the peak observed at 18 cm-1 likely corresponds to the symmetric out-of-plane torsion A″ vibration. Since the VCI treatment of the vibrational motions accounts for vibrational mixing and delocalization, overtones and combination bands were also observed and quantified in the intermolecular regions of the two trimer isomers.
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Affiliation(s)
- Jesus Ruiz
- Department of Chemistry and Biochemistry, California State University, Los Angeles, 5151 State University Drive, Los Angeles, California 90032, USA
| | - Kyle Misa
- Department of Chemistry and Biochemistry, California State University, Los Angeles, 5151 State University Drive, Los Angeles, California 90032, USA
| | - Arabi Seshappan
- Department of Chemistry and Biochemistry, California State University, Los Angeles, 5151 State University Drive, Los Angeles, California 90032, USA
| | - Murat Keçeli
- Computational Science Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Olaseni Sode
- Department of Chemistry and Biochemistry, California State University, Los Angeles, 5151 State University Drive, Los Angeles, California 90032, USA
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