The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Departamento de Física e Química, Universidade de Caxias do Sul, Centro de Ciências Exatas e Tecnologia, Rua Francisco Getúlio Vargas 1130, 95070-560 Caxias do Sul-RS, Brazil
Universidade Federal do Rio Grande do Sul, Instituto de Física, 91501-970 Porto Alegre-RS, Brazil
Universidade Federal do Rio Grande do Sul, Instituto de Física, 91501-970 Porto Alegre-RS, Brazil
Instituto Nacional de Metrologia, Normalização e Qualidade Industrial—INMETRO, Av. Nossa Senhora das Graças 50, Xerém, Duque de Caxias 25250-020 RJ, Brazil