J. Appl. Phys. 127, 055702 (2020); https://doi.org/10.1063/1.5142376 127, 055702 © 2020 Author(s). Determination of dielectric axes and transition moment directions in β-Ga 2 O 3 from the polarization dependence of vibrational spectra Cite as: J. Appl. Phys. 127, 055702 (2020); https://doi.org/10.1063/1.5142376 Submitted: 12 December 2019 . Accepted: 21 January 2020 . Published Online: 04 February 2020 Amanda Portoff, Andrew Venzie, Michael Stavola , W. Beall Fowler, and Stephen J. Pearton COLLECTIONS Paper published as part of the special topic on Defects in Semiconductors 2020 Note: This paper is part of the Special Topic on Defects in Semiconductors 2020. ARTICLES YOU MAY BE INTERESTED IN Self-trapped hole and impurity-related broad luminescence in β-Ga 2 O 3 Journal of Applied Physics 127, 075701 (2020); https://doi.org/10.1063/1.5140742 A review of Ga 2 O 3 materials, processing, and devices Applied Physics Reviews 5, 011301 (2018); https://doi.org/10.1063/1.5006941 Giant shifts of photoluminescence bands in GaN Journal of Applied Physics 127, 055701 (2020); https://doi.org/10.1063/1.5140686