Search Results - "Simas, A.M."

Spectroscopic properties and design of highly luminescent lanthanide coordination complexes by de Sá, G.F, Malta, O.L, de Mello Donegá, C, Simas, A.M, Longo, R.L, Santa-Cruz, P.A, da Silva, E.F

“…In this paper recent advances in the development of efficient light conversion molecular devices (LCMD) based on lanthanide complexes are reviewed, with…”
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Synthesis and two-photon absorption spectrum of fluorenone-based molecules by Dipold, J., Batista, R.J.M.B., Fonseca, R.D., Silva, D.L., Moura, G.L.C., dos Anjos, J.V., Simas, A.M., De Boni, L., Mendonca, C.R.

“…[Display omitted] •Five different fluorenone-based compounds were synthesized.•Their two-photon absorption cross-sections range from 100 to 230GM, around…”
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Nonlinear absorption of new mesoionic compounds by Pilla, V., de Araújo, Cid B., Lira, B.F., Simas, A.M., Miller, J., Athayde-Filho, P.F.

“…The nonlinear absorption of new mesoionic compounds (MIC) was investigated using nanosecond laser pulses with wavelengths at 570, 605 and 618 nm. Nonlinear…”
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Exact topological twistons in crystalline polyethylene by Ventura, E., Simas, A.M., Bazeia, D.

“…We investigate the presence of topological twistons in crystalline polyethylene. We describe crystalline polyethylene with a model that couples the torsional…”
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Two-photon absorption in mesoionic compounds pumped at the visible and at the infrared by Rakov, N, de Araújo, Cid B, da Rocha, G.B, Simas, A.M, Athayde-Filho, P.A.F, Miller, J

“…Intensity dependent transmission and laser-induced fluorescence were observed in liquid solutions of mesoionic compounds (MIC) pumped with nanosecond lasers…”
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Diffusion, reaction kinetics and exchange of sodium in aqueous solutions containing a crown ether by Hallwass, Fernando, Engelsberg, M., Simas, A.M., Barros, Wilson

“…Sodium self-diffusion coefficients in aqueous solutions containing various amounts of crown ether (18-crown-6) were measured using pulsed field gradient…”
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Ultrafast dynamics of mesoionic liquid solutions studied with incoherent light by Menezes, L.de S., de Araújo, Cid B., Alencar, M.A.R.C., Athayde-Filho, P.F., Miller, J., Simas, A.M.

“…Optical Kerr shutter (OKS) measurements were performed in a solution of a mesoionic compound (MIC) in dimethylsulfoxide using 10 ns pulses of broadband noisy…”
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Mesoionic rings as third-order non-linear optical materials by Bezerra, A.G, Gomes, A.S.L, Athayde-Filho, P.F, da Rocha, G.B, Miller, J, Simas, A.M

“…A study of the non-linear refractive index ( n 2) and the non-linear absorption coefficient ( α 2) of molecules containing mesoionic rings in solution has been…”
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Anion influence on complex formation between 18-crown-6 and sodium ion in aqueous solutions by Yuldasheva, L.N., Hallwass, F., da Cruz Gonçalves, S.M., Simas, A.M., Krasilnikov, O.V.

“…Conductivities of 100 mM aqueous solutions of several sodium salts were studied in the presence of three nonelectrolytes (18-crown-6, polyethylene glycol 300,…”
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Crystallographic and theoretical investigations of the preferred conformations of three isomeric N-acetyl-dihydro-oxadiazoles by Carpenter, G.B., Ventura, E., De Morais, L.P.F., Srivastava, R.M., Simas, A.M., Faure, R.

“…Structures of three isomeric 2- and 4- acetyl-5-ethyl-3-tolyl-dihydro-1,2,4-oxadiazoles 1– 3 have been determined by X-ray analysis of their single crystals…”
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On the implicit integral character of Roothaan's expansion by DACOSTA, H. F. M, TRSIC, M, DA SILVA, A. B. F, SIMAS, A. M

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Third-order optical nonlinearities in mesoionic compounds by Bezerra, A.G., Gomes, A.S.L., Athayde-Filho, P.F., da Rocha, G.B., Miller, J., Simas, A.M.

“…Summary form only given.We describe the application of the well-known Z-scan technique to determine the nonlinear refractive index, n/sub 2/, of seven…”
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Design of ligands to obtain lanthanide ion complexes displaying high quantum efficiencies of luminescence using the sparkle model by Faustino, W.M, Rocha, G.B, Gonçalves e Silva, F.R, Malta, O.L, de Sá, G.F, Simas, A.M

“…In this paper we exemplify how to use our sparkle model for the calculation of lanthanide complexes (SMLC-AM1-INDO/S-CI) together with Fermi's golden rule with…”
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Third-order optical nonlinearities in retinal derivatives and mesoionic compounds by Bezerra, A.G., Gomes, A.S.L., de Araujo, C.B., da Silva-Filho, D.A., de Melo, C.P., Athayde-Filho, A.P.F., da Rocha, G.B., Miller, J., Simas, A.M.

“…We describe the application of the z-scan technique to determine the nonlinear refractive index of 13-cis retinal aldehyde (13CRA), 13-cis retinoic acid…”
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Experimental and computational studies of optical nonlinearities in mesoionic compounds by Bezerra, A.G., Maciel, G.S., Gomes, A.S.L., De Araujo, C.B., Athayde-Filho, P.F., Da Rocha, G.B., Miller, J., Simas, A.M.

“…In this work we describe the application of the hyper-Rayleigh scattering technique (HRS) and the Z-scan technique to determine /spl beta/ and /spl gamma/, the…”
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