The Raman spectra of MoO3 implanted with 1, 2, and 4×1016 H+/cm2 have been recorded at room temperature. It was found that most of the Raman modes of Ag and Bg symmetry, which are observed between 100 and 1100 cm−1, decrease in intensity by the electronic screening of phonons as a result of the electron transfer from hydrogen to Mo. In addition, both Raman modes of Ag symmetry at 998 and 811 cm−1 for MoO3 noticeably stiffened at 4×1016 H+/cm2, while the orthorhombic structure of MoO3 remains unchanged exhibiting no significant change in lattice parameters except for any possible distortion of the MoO6 octahedron. The present results are compared with previous studies, in reference to structural information of the hydrogen molybdenum bronzes as well as MoO3.
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Hirata et al. (1996) studied this question.