@article{BeckerNath1970,
  author    = {Becker, Charles R. and Nath, G.},
  title     = {Optical properties of LiIO\(_3\) in the far infrared},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-37905},
  year      = {1970},
  abstract  = {No abstract available},
  language  = {en}
}
@article{Becker1970,
  author    = {Becker, Charles R.},
  title     = {Impurity-induced absorption in or near the phonon gap of KI},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-30757},
  year      = {1970},
  abstract  = {In or near the phonon gap of KI a single weak line due to OW (OD\(^-\)) at 69.7 (69.3) cm\(^{-1}\) has been observed. A second and much stronger line at 94.1 cm\(^{-1}\) was shown not to be related to OH\(^-\), but instead is thought to be due to CO\(_3\).},
  language  = {en}
}
@article{Becker1971,
  author    = {Becker, Charles R.},
  title     = {Evidence for a quasi-phonon gap in CsCl},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-30767},
  year      = {1971},
  abstract  = {The observed impurity induced far-infrared absorption in CsCl : Rb\(^+\) and CsCl : K\(^+\) is compared with a calculated density of acoustic phonon states in CsCl. The absorption due to CsCl : Rb\(^+\) displays a minimum between the acoustic and optic phonon bands. A narrow line is observed in CsCl: K\(^+\) at 85.8 cm\(^{-1}\) which falls in this quasi-phonon gap.},
  language  = {en}
}
@article{DeciusBeckerFredericks1972,
  author    = {Decius, J. C. and Becker, Charles R. and Fredericks, W. J.},
  title     = {Force constants of the metaborate ion in alkali halides},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-50935},
  year      = {1972},
  abstract  = {No abstract available},
  subject      = {Physik},
  language  = {en}
}
@article{BeckerMartin1972,
  author    = {Becker, Charles R. and Martin, T. P.},
  title     = {Infrared absorption by Impurity-pair resonant modes in NaCl:F},
  isbn      = {1098-0121},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-37840},
  year      = {1972},
  abstract  = {New resonant-mode infrared absorption lines have been observed in NaCl with high concentrations of fluorine impurities. The quadratic concentration dependence of the strength of these lines indicates that they are due to pairs of fluorine impurities. At the resonant frequencies, the motion of some host ions appears to be as important as the motion of the impurities themselves.},
  subject      = {Festk{\"o}rperphysik},
  language  = {en}
}
@misc{IshigamaBeckerMartinetal.1972,
  author    = {Ishigama, M. and Becker, Charles R. and Martin, T. P. and Prettl, W.},
  title     = {Impurity-pair mode in NaCl:KF},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-31255},
  year      = {1972},
  abstract  = {No abstract available},
  language  = {en}
}
@misc{DeciusBeckerFredericks1973,
  author    = {Decius, J. C. and Becker, Charles R. and Fredericks, W. J.},
  title     = {Erratum: Force constants of the metaborate ion in alkali halides},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-37992},
  year      = {1973},
  abstract  = {Erratum for the article: Decius, J. C. ; Becker, Charles R. ; Fredericks, W. J. : Force constants of the metaborate ion in alkali halides, In: THE JOURNAL OF CHEMICAL PHYSICS (1972), 56, 10, 5189-5190.},
  language  = {en}
}
@misc{UnkelbachBeckerKoehleretal.1973,
  author    = {Unkelbach, K. H. and Becker, Charles R. and K{\"o}hler, H. and Middendorff, A. V.},
  title     = {Optical Phonons of Bi\(_2\)Te\(_3\)},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-30809},
  year      = {1973},
  abstract  = {No abstract available},
  language  = {en}
}
@article{KoehlerBecker1974,
  author    = {K{\"o}hler, H. and Becker, Charles R.},
  title     = {Optically active lattice vibrations in Bi\(_2\)Se\(_3\)},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-31296},
  year      = {1974},
  abstract  = {The preparation of Bi2Sea single crystals with low free carrier densities allowed an investigation of the lattice vibrations to be carried out from the reflectivity of cleavage planes at nearly normal incidence of the radiation (E ~ c). The experimental results ean be explained with two classical oscillators, whose eigenfrequencies oceur at 92 and 69.5 cm-I. The static dielectric constant was determined to be 100 ± 10 for E ~ c.},
  language  = {en}
}
@article{BeckerLauGEICKetal.1975,
  author    = {Becker, Charles R. and Lau, Ph. and GEICK, R. and Wagner, V.},
  title     = {Antiferromagnetic Resonance in NiO:Co\(^{2+}\) and NiO:Fe\(^{2+}\)},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-30772},
  year      = {1975},
  abstract  = {No abstract available.},
  language  = {en}
}