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Inorganic Materials Research Program, Queensland University of Technology, 2 George Street, GPO Box 2434, Brisbane, Queensland 4001, Australia
Correspondence: * E-mail: t.kloprogge{at}qut.edu.au
Raman and infrared active modes of cerussite were assigned according to their symmetry species and compared to other aragonite group minerals. Small satellite bands at 823 and 1031 cm1 on the low-wavenumber side of the fundamental vibrations
2 and
1, respectively, have been assigned to the isotopic substitutions of 13C and 18O. The Raman active
1 and
2 carbonate modes are observed at 1051 and 835 cm1. The absence of the B2g component of the
1 and
2 vibrations has been explained by the small coupling between the Ag and B2g modes. The Raman active
3 carbonate anti-symmetric stretching mode is observed at 1361 (Ag), 1376 (B1g), 1419 (B3g), and 1477 (B2g) cm1, while the corresponding infrared active bands are observed at 1396, 1432, and 1456 cm1. The Raman active
4 carbonate bending mode is observed at 673 (Ag), 668 (B2g), 681 (B1g), and 694 (B2g) cm1. The corresponding infrared bands are observed at 670, 679, and 698 cm1. In both
3 and
4 the factor group splitting between the B1g and B3g modes is 1 to 3 times smaller than the separation of the Ag and B2g modes. Raman active lattice vibrations are detected at 120 (B3g), 132 (Ag), 148 (B1g), 152 (B2g), 174 (B2g), 179 (B1g), 213 (Ag), 226 (B3g), and 243 cm1 (B2g). Corresponding infrared active bands are detected at 573, 543, 573, 423, 375, 290, 205, 165, 146, and 134 cm1. Raman bands at 949, 966, 989, 1000, and 1104 cm1 and at 922, 946, 967, 988, 996, and 1007 cm1 in the infrared spectra are assigned to combination and overtone bands. Raman bands at 1676 (Ag), 1689 (Ag), 1730 (B3g), and 1740 (B1g) cm1 are ascribed to combination modes of
1 +
4 with bands at 2052 and 2092 cm1 assigned to 2
1. Corresponding infrared bands are observed at 1729 and 1740 cm1 (
1 +
3). Bands at 2359, 2409, 2471, and 2521 cm1 are ascribed to
1 +
3, with broad bands at 1246 and 1323 cm1 assigned to 2
4 modes.
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