Banca de DEFESA: JERRY ANDERSON DE JESUS SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : JERRY ANDERSON DE JESUS SANTOS
DATA : 04/11/2020
HORA: 09:00
LOCAL: ConferênciaWeb https://conferenciaweb.rnp.br/webconf/ppgfisdefesas
TÍTULO:

PREPARATION OF THIN AMINO ACID FILMS BY WPS AND EFFECTIVE CELL, WITH CHARACTERIZATION VIA FTIR AND MEV, FOR DETERMINATION OF THE OPTICAL CONSTANT.

PALAVRAS-CHAVES:

“A-value”, Spine Density, WPS, Absorbance, SEM.

PÁGINAS: 81
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
RESUMO:

There are models that seek to describe the evolution (formation and destruction) of molecules in the face of radiation and these models require quantities that are often obtained in laboratory experiments that seek to simulate condensates of astrophysical ice. As an example, we have the magnitude A-value, in which tabulated values are available for a few compounds and, due to this optical constant, the density of the column can be obtained, with the use of absorbance, which is very important for the comparison of the results obtained in the models with those collected in astronomical and astrophysical observations. In this sense, the purpose of this dissertation is to evaluate the relationship between the integrated absorbance and the average thickness of thin films of amino acids (produced at LEMFF / UFBA) and, therefore, the concentration of the sample, which is essential for determining the optical constant , unavailable for amino acids, this for each band analyzed in the FTIR. For this purpose, thin films of the amino acids alanine-LD (C3H7NO2), valine (C5H11NO2) and glycine (C2H5NO2) were produced by vacuum deposition on SeZn substrates and on glass slides, using an evaporating cell. Also,
the WPS technique was used, only for alanine-LD, and the characterization of thin films by the FTIR technique and the UFBA MEV, respectively. The knowledge of A-value is important to obtain the density of
column, as a consequence, allow to express the shock section of creation and destruction for radiolysis processes. As outstanding results, in this work we obtained the expressions of the average thicknesses as a function of the integrated absorbance for the four films. The A-value mean values obtained from the A-value values of the individual bands for the four films made were also obtained, being the films Alanine-WPS (Ã = 7.3x10-19cm.moleculas-1), alanine-effusive cell (Ã = 2.7X10-18cm.moleculas-1), glycine- effusive cell (Ã = 3.1X10-18), valine-effusive cell (Ã = 3.9X10-19 cm.moleculas-1).

 

MEMBROS DA BANCA:
Interno - 1194645 - FREDERICO VASCONCELOS PRUDENTE
Presidente - 1878138 - LUIZ ANTONIO VIEIRA MENDES
Externo à Instituição - MANOEL GUSTAVO PETRUCELLI HOMEM - UFSCAR