Banca de DEFESA: GEORGE LUIZ SANTOS DE SOUSA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : GEORGE LUIZ SANTOS DE SOUSA
DATA : 21/08/2020
HORA: 14:30
LOCAL: ConferênciaWeb https://conferenciaweb.rnp.br/webconf/ppgfisdefesas
TÍTULO:

SETUP COMMISSIONING FOR ABSOLUTE SHOCK SECTION MEASURES PHASE OF GAS PHASE IN THE VUV REGION AND CALCULATION OF THE RATE OF PHOTOLYSIS OF FORMIC ACID IN THE RANGE OF 13.6 TO 21 eV

PALAVRAS-CHAVES:

Photoionization Cross Section; Double Ion Chamber; Formic Acid; Photolysis Rate.

PÁGINAS: 118
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
RESUMO:

This research work consisted of commissioning a setup to obtain a absolute photoionization cross section in the gas phase in the vacuum ultraviolet (VUV) range of the Laboratório de Espectroscopia Molecular e Filmes Finos [LEMFF] da Universidade Federal da Bahia [UFBA]. The radiation source used was the UVLS600 model combined with the TMM 304 monochromator, both from the german company SPECS. One of the commissioning works was to obtain the necessary parameters to operate with argon plasma in the process of generating photons with energies in the VUV range. The detection part of this setup was based on the double ion chamber technique and had as its initial objective the determination of the absolute photoionization cross sections of organic molecules of astrophysical interest, the test molecule being Formic Acid (HCOOH). Recent detections in Hot Corinos point to the formation of complex molecules in the interstellar medium, including formic acid. Results of photoionization of organic molecules, which can be used in the modeling of chemical kinetics and photolysis rates, are essential for the representation of interstellar environments, where the interaction of photons with molecules play an important role in the energy balance of the medium. Literature data from the formic acid photoionization cross section in the VUV region were used to calculate the coefficient of the photolysis rate and its average lifetime in star-forming regions.

MEMBROS DA BANCA:
Interno - 1194645 - FREDERICO VASCONCELOS PRUDENTE
Externo à Instituição - MANOEL GUSTAVO PETRUCELLI HOMEM - UFSCAR
Interno - 2422135 - RICARDO DOS REIS TEIXEIRA MARINHO