Zobrazeno 1 - 10
of 113
pro vyhledávání: '"Oswaldo Sala"'
Autor:
Oswaldo Sala
Publikováno v:
Química Nova, Vol 31, Iss 4, Pp 914-920 (2008)
Iodine vapor is a very suitable substance to learn about molecular energy levels and transitions, and to introduce spectroscopic techniques. As a diatomic molecule its spectra are relatively simple and allow straightforward treatment of the data lead
Externí odkaz:
https://doaj.org/article/2ebd9e0acf684318aa993b3646388d60
Autor:
Oswaldo Sala
Publikováno v:
Química Nova, Vol 30, Iss 8, Pp 2057-2061 (2007)
The present article is devoted to Chemistry or Physics undergraduate students, given their difficulty to understand fundamental concepts and technical language used in atomic spectroscopy and quantum mechanics. An easy approach is shown in the treatm
Externí odkaz:
https://doaj.org/article/3b68f047a9d345dabf8b92c8d4751e95
Publikováno v:
Química Nova, Vol 22, Iss 4, Pp 541-552 (1999)
The Surface Enhanced Raman Scattering (SERS) effect was observed for the first time in 1974, but it was only considered a new effect three years later, hence, nearly twenty years ago. Since its discovery, a significant amount of investigations have b
Externí odkaz:
https://doaj.org/article/1eb4fbe4c34441809205edcb610a95a6
Autor:
Oswaldo Sala
Publikováno v:
Química Nova, Vol 30, Iss 7, Pp 1773-1775 (2007)
The Balmer equation is obtained from the hydrogen spectrum in an empirical way, using a graphic method; from this equation the energy level terms are derived. Emphasis is given to concepts in order to make clear the meaning of quantum numbers, eigenv
Externí odkaz:
https://doaj.org/article/2094a73ec1dd40bab7da1fe44febf20d
Publikováno v:
Journal of Raman Spectroscopy. 39:415-420
Benzene adsorbed on highly acidic sulfated TiO2 (S-TiO2) shows an intriguing resonance Raman (RR) effect, with excitation in the blue-violet region. There are very interesting spectral features: the preferential enhancement of the e2g mode (1595 cm
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::43716f74e8189357ff6e38a15ca239ba
https://doi.org/10.1002/jrs.1843
https://doi.org/10.1002/jrs.1843
Publikováno v:
Journal of Molecular Structure. 690:77-81
2-Hydroxy-2-oxo-1,4,2-oxa-aza-phospha(V) cyclohexane-4-methylene phosphonic acid (OAPhMPh) was obtained by a Mannich type reaction. From NMR spectroscopy a chair-conformed heterocyclic structure is suggested. Infrared and Raman data are in agreement
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cda1b175c88fc29b726c6745e74d3890
https://doi.org/10.1016/j.molstruc.2003.11.034
https://doi.org/10.1016/j.molstruc.2003.11.034
Autor:
Sandra Regina Mutarelli, Oswaldo Sala, Ana Maria Pereira Neto, Paulo Sérgio da Silva Santos, Norberto S. Gonçalves, Lúcia K. Noda
Publikováno v:
Journal of Molecular Structure. 645:185-191
The resonance Raman excitation profiles of the dithiosquarate in the solid state, as its thallium salt, and in aqueous solution as its sodium salts were obtained. The assignment of its vibrational frequencies to the normal modes was carried out on ba
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0ea13943e2680c4a9117804dbdbce579
https://doi.org/10.1016/s0022-2860(02)00566-5
https://doi.org/10.1016/s0022-2860(02)00566-5
Autor:
Claudio A. Téllez S, Roberto B. Faria, Paulo Sérgio da Silva Santos, Wagner A. Alves, Oswaldo Sala
Publikováno v:
Journal of Raman Spectroscopy. 32:1032-1036
Raman spectra of aqueous halate and oxyacids HXO3 (X = Cl,Br) solutions were obtained. Integrated Raman intensity measurements of the 804 and 933 cm−1 bands of HBrO3 and HClO3 in aqueous solutions, respectively, allowed the determination of the deg
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a3c598f4d8ed44293aa6bf70f6ba7dfe
https://doi.org/10.1002/jrs.794
https://doi.org/10.1002/jrs.794
Publikováno v:
Journal of Molecular Structure. :411-416
In this work a vibrational investigation of the equilibrium species in aqueous solution of nicotinic acid was performed, by both experimental as well as theoretical methods. The Raman spectra of its aqueous solutions at some pH values were obtained a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7db4799c4ee5cc591a2c3701fc8012b7
https://doi.org/10.1016/s0022-2860(00)00936-4
https://doi.org/10.1016/s0022-2860(00)00936-4