Cross Sections and Asymmetry Parameters for Formic Acid in the Vacuum-Ultraviolet Energy Range

Autor(es)

Fujimoto, M. M. ^[1] ; Tanaka, H. K. ^{[2, 3]} ; Marinho, R. R. T. ^[4] ; Medina, A. ^[5] ; Prudente, V, F. ; Homem, M. G. P. ^[6]

Afiliação do(s) autor(es)

^[1] Univ Fed Parana, Dept Fis, BR-81531980 Curitiba, Parana - Brazil

^[2] Inst Fed Bahia, BR-45810000 Porto Seguro, BA - Brazil

^[3] V, Univ Fed Bahia, Inst Fis, BR-40170115 Salvador, BA - Brazil

^[4] Univ Brasilia, Inst Fis, BR-70910970 Brasilia, DF - Brazil

^[5] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, RJ - Brazil

^[6] Univ Fed Sao Carlos, Dept Quim, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Physical Chemistry A; v. 124, n. 32, p. 6478-6485, AUG 13 2020.
• Citações Web of Science: 0

Resumo

We present an experimental and theoretical investigation of the photon interaction with formic acid in the vacuum-ultraviolet energy range. The absolute absorption cross sections and ionization efficiencies were measured in the 11.2-21.4 and 13.5-21.4 eV ranges, respectively, using a double-ion chamber technique. Photoionization and neutral-decay cross sections were derived from these results. From the present ionization cross sections and previously reported ionic dissociative branching ratios, the partial cross sections for dissociating processes were obtained. Theoretically, the photoionization cross sections and the asymmetry parameters of the photoelectron angular distributions for ionization out of the six outermost valence orbitals (10a', 2a `', 9a', 1a `', 8a', and 7a') were obtained in the energy range from near-threshold to 35 eV. For that, the Pade approximant technique along with the single-center partial-wave expansion method was applied to solve the Lippmann-Schwinger equation in the static-exchange-polarization level of approximation. This is the first theoretical investigation concerning the determination of the asymmetry parameters and photoionization cross sections of formic acid in the vacuum-ultraviolet energy range. Comparison is made between our results and the previous ones. (AU)

• Processo FAPESP: 15/08258-2 - Seções de choque para a interação de elétrons com moléculas orgânicas voláteis
• Beneficiário: Manoel Gustavo Petrucelli Homem
• Modalidade de apoio: Auxílio à Pesquisa - Regular