Antiresonances in the absorption spectra of Cr3+-doped fluorochloro-zirconate glasses

Molecular Properties Obtained by Analysis of Electronic Spectra Containing Interference Dips. Comparisons of Analytical Equations and Exact Models Based on Coupled Potential Energy Surfaces

“…1,[3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] These dips are very common in the spectra of octahedral chromium(III) complexes where the narrow absorption bands arise from intraconfigurational transitions and the broad band from π* to σ* d-d transitions. The dips are found not only in the spectra of chromium-containing molecules but also in the spectra of crystals in which chromium is substituted for another ion in the lattice.…”

“…The dips are found not only in the spectra of chromium-containing molecules but also in the spectra of crystals in which chromium is substituted for another ion in the lattice. [4][5][6]8,10,11,14,16,[19][20][21] Spectra of other d 3 metal ions, especially those from vanadium(II), 3,9 also exhibit dips; the state energies in ions with this electron configuration are frequently close to each other, and the bands overlap to produce the effect. Dips are not limited to d 3 metal ions; examples are also found in the spectra of d 8 nickel compounds, 22 d 2 chromium(IV) ions doped into a crystal lattice with tetrahedral sites, 13 and d 4 manganese(III) ions doped into oxide lattices.…”

“…Interference dips, , sharp absorbance decreases in the electronic absorption spectra of metal-containing compounds and crystals at the energies where absorbances with very narrow bandwidths overlap a broad band, are frequently observed. ,− These dips are very common in the spectra of octahedral chromium(III) complexes where the narrow absorption bands arise from intraconfigurational transitions and the broad band from π* to σ* d−d transitions. The dips are found not only in the spectra of chromium-containing molecules but also in the spectra of crystals in which chromium is substituted for another ion in the lattice. − ,,,,,,− Spectra of other d 3 metal ions, especially those from vanadium(II), , also exhibit dips; the state energies in ions with this electron configuration are frequently close to each other, and the bands overlap to produce the effect. Dips are not limited to d 3 metal ions; examples are also found in the spectra of d 8 nickel compounds, d 2 chromium(IV) ions doped into a crystal lattice with tetrahedral sites, and d 4 manganese(III) ions doped into oxide lattices. , Dips are also common in the spectra of lanthanide compounds where sharp f−f transitions overlap broad d−f bands.…”

A Criterion for Evaluating the Thermal Stability of Glasses

“…Besides the traditional silicate glass, numerous new glass systems have been developed under the demand of modern industrial applications. [1][2][3][4] These glasses include phosphate glass, 5,6 amorphous metal alloy [7][8][9] and fluoride glass, 10,11 etc. The critical issue for the existing or potential applications of these glasses is their thermal stability against crystallization.…”

“…In the past decades, glass and glass−ceramics have attracted much attention because of their unique properties, such as excellent chemical durability, amazing optical transparency, and excellent electrical properties. Besides the traditional silicate glass, numerous new glass systems have been developed under the demand of modern industrial applications. − These glasses include phosphate glass, , amorphous metal alloy − and fluoride glass, , etc. The critical issue for the existing or potential applications of these glasses is their thermal stability against crystallization.…”