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O desenvolvimento de um polo de ensino pós-graduado e de pesquisa em Geofísica, no Instituto de Física da UFBA, nos anos sessenta, do século XX, teve no seu início uma forte cooperação francesa, a qual é aqui resgatada com a finalidade de narrar a sua história e discutir algumas implicações.

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Using an extended expression for the Landau-Lifshitz free-energy density we have computed order-parameter fluctuation eigenmodes for the triple hexagonal incommensurate charge-densitywave (ICDW) phase in 2H-TaSe 2. Phasons and amplitudons have been obtained for two particular directions and we have performed some numerical calculations.

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We h a ve performed some calculations involving two eigenmode frequencies of 2H , T a S e 2. We h a ve obtained a good comparison with some well established Raman scattering data for the commensurate and incommensurate charge-density-wave phases in this compound. We outline an approximated method to compute the determinantal equation.