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Dalagnol LV, Bettega MHF, Jones NC, Hoffmann SV, Souza Barbosa A, Limão-Vieira P. Electronic State Spectroscopy of Nitromethane and Nitroethane. J Phys Chem A 2023; 127:1445-1457. [PMID: 36730450 PMCID: PMC9940216 DOI: 10.1021/acs.jpca.2c08023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
High-resolution photoabsorption cross-sections in the 3.7-10.8 eV energy range are reinvestigated for nitromethane (CH3NO2), while for nitroethane (C2H5NO2), they are reported for the first time. New absorption features are observed for both molecules which have been assigned to vibronic excitations of valence, Rydberg, and mixed valence-Rydberg characters. In comparison with nitromethane, nitroethane shows mainly broad absorption bands with diffuse structures, which can be interpreted as a result of the side-chain effect contributing to an increased number of internal degrees of freedom. New theoretical quantum chemical calculations performed at the time-dependent density functional theory (TD-DFT) level were used to qualitatively help interpret the recorded photoabsorption spectra. From the photoabsorption cross-sections, photolysis lifetimes in the terrestrial atmosphere have been obtained for both compounds. Relevant internal conversion from Rydberg to valence character is noted for both molecules, while the nuclear dynamics of CH3NO2 and C2H5NO2 along the C-N reaction coordinate have been evaluated through potential energy curves at the TD-DFT level of theory, showing that the pre-dissociative character is more prevalent in nitromethane than in nitroethane.
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Affiliation(s)
- Luiz V.
S. Dalagnol
- Departamento
de Física, Universidade Federal do
Paraná, Caixa
Postal 19044, 81531-980Curitiba, Paraná, Brazil
| | - Márcio H. F. Bettega
- Departamento
de Física, Universidade Federal do
Paraná, Caixa
Postal 19044, 81531-980Curitiba, Paraná, Brazil
| | - Nykola C. Jones
- ISA,
Department of Physics and Astronomy, Aarhus
University, Ny Munkegade
120, DK-8000Aarhus
C, Denmark
| | - Søren V. Hoffmann
- ISA,
Department of Physics and Astronomy, Aarhus
University, Ny Munkegade
120, DK-8000Aarhus
C, Denmark
| | - Alessandra Souza Barbosa
- Departamento
de Física, Universidade Federal do
Paraná, Caixa
Postal 19044, 81531-980Curitiba, Paraná, Brazil,
| | - Paulo Limão-Vieira
- Departamento
de Física, Universidade Federal do
Paraná, Caixa
Postal 19044, 81531-980Curitiba, Paraná, Brazil,Atomic
and Molecular Collisions Laboratory, CEFITEC, Department of Physics,
NOVA School of Science and Technology, Universidade
NOVA de Lisboa, 2829-516Caparica, Portugal,
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