Spectroscopy is the study of the interaction between matter and electromagnetic radiation.
 Historically, spectroscopy originated through the study of visible light dispersed according to its wavelength, by a prism.
 Later the concept was expanded greatly to include any interaction with radiative energy as a function of its wavelength or frequency.
 Spectroscopic data is often represented by an emission spectrum, a plot of the response of interest as a function of wavelength or frequency.
Una Canger ("née" Una Rasmussen) (born May 14, 1938) is a Danish linguist specializing in languages of Mesoamerica.
 She has published mostly about the Nahuatl language with a particular focus on the dialectology of Modern Nahuatl, and is considered among the world's leading specialists in this area.
 She held tenure at the University of Copenhagen, leading the department for Native American Languages and Cultures until she reached the age of 70 in 2008 and was forced into retirement.
 In 2012 she was awarded the Order of the Aztec Eagle for her contributions to the study of Mexican culture.
 In 2005 she received the teaching prize of Copenhagen University, the Harald.
The Copenhagen–Tartu school of biosemiotics is a loose network of scholars working within the discipline of biosemiotics at the University of Tartu and the University of Copenhagen.
 The school has been instrumental in developing biosemiotics as a new perspective on the study of life, in the biological and environmental sciences. Notable semioticians working in the Copenhagen–Tartu school are: Kalevi Kull, Jesper Hoffmeyer, Peeter Torop, Claus Emmeche, Timo Maran, Mihhail Lotman.
David Simonsen (1853–1932) was born in Copenhagen, Denmark.
 He studied Oriental languages at the University of Copenhagen, and received his rabbinical training at the Jewish Theological Seminary (Jüdisch-Theologisches Seminar) in Breslau, one of the centers of the movement advocating the scientific study of Jewish history, literature and culture, as well as of the classical sources of Judaism (“Wissenschaft des Judentums”).
 After his graduation, Simonsen returned to Denmark and a position as Rabbi in the Jewish Congregation of Copenhagen.
 He married Cora Salomon (1856-1938) and for ten years (1892-1902), David Simonsen held the office of Chief Rabbi.
 In 1903 he was awarded the title of professor by the University of Copenhagen.
Frederik Michael Liebmann (10 October 1813 – 29 October 1856) was a Danish botanist.
 Liebmann studied botany at the University of Copenhagen, although he never obtained a formal qualification.
 He went on study tours of Germany and Norway before becoming lecturer at the Danish Royal Veterinary School in 1837.
 In 1840 he travelled to Cuba and Mexico; on his return in 1845 he was appointed Professor of Botany at the University of Copenhagen.
 He became Director of the university's Botanical Garden in 1852, a post he held until his death four years later.
Dorji Wangchuk [Prof. Dr.] (born 1967) is the professor for Tibetan (Buddhist) Studies at the Department of Indian and Tibetan Studies, Asien-Afrika-Institut, Universität Hamburg, Germany, and is a contemporary Tibetologist and a Buddhologist.
 After completing a nine-year course in the study of Tibetan Buddhism from a traditional Tibetan Buddhist monastic seminary in South India (i.e. sNga-’gyur-mtho-slob-mdo-sngags-rig-pa’i-’byung-gnas-gling, Bylakuppe, Mysore), Dorji Wangchuk studied Classical Indology (first major, with a focus on Buddhist Studies) and Tibetology (second major) at the Universität Hamburg (MA 2002).
 He wrote his doctoral dissertation on “The Resolve to Become a "Buddha": A Study of the "Bodhicitta" Concept in Indo-Tibetan Buddhism” and received his PhD from the same University in 2005.
 Between 1992 and 1996, he taught Tibetan Buddhist monks and nuns in monastic seminaries in India.
 Since 1998, he has been teaching and researching at the Universität Hamburg in various capacities.
 He also taught a term each at the University of Copenhagen, McGill University, and Renmin University of China.
 Currently he is a professor for Tibetology (“Tibetan (Buddhist) Studies”) at the Department of Indian and Tibetan Studies, Asien-Afrika-Institut, Universität Hamburg.
 He is also the founder and director of the Khyentse Center for Tibetan Buddhist Textual Scholarship (KC-TBTS), a research center within the Department of Indian and Tibetan Studies, Asien-Afrika-Institut, Universität Hamburg.
 His main teaching and research interests lie in Tibetan Buddhist philosophy, Tibetan intellectual history and history of ideas, and Tibetan Buddhist intellectual/literary/textual culture.
 Currently he is working on the perception and reception of Yogācāra in Tibet and on the identity, superiority, and authenticity issues of the "Vidhyādharapiṭaka" in Tibetan Buddhism.
Børge Bak (31 December 1912 – 22 February 1990), D.Phil., Knight of the Order of the Dannebrog 1st Class, was a Danish polymath, inventor, chemist and Professor of Molecular Spectroscopy at the University of Copenhagen, best known for his early contributions to the field of Molecular Spectroscopy.
 Bak travelled widely as a visiting Professor, including to the University of California, Berkeley (1969) and the University of Bologna (1976).
 He served as a nominator to the Nobel Committee for Chemistry, was the recipient of the 1957 Esso Foundation's prize for outstanding technical science research, and was elected a member of the Royal Danish Academy of Sciences in 1958.
The University of Copenhagen Geological Museum is a geology museum located on Øster Voldgade, at the northeast corner of the University of Copenhagen Botanical Garden, in Copenhagen, Denmark.
 Like the botanical garden, the museum is part of the wider array of centers belonging to the Natural History Museum of Denmark.
 The museum houses exhibits but also facilitates research and study as part of the University of Copenhagen, with some of the museum staff actively partaking in research worldwide—for instance, in Greenland.
Before founding the Complexity Science Group at the University of Calgary, she held appointments at numerous institutions around the world, most notably, M.I.T., Brookhaven National Laboratory, the Niels Bohr Institute (Copenhagen, Denmark), the University of Houston, NORDITA (Copenhagen, Denmark), Imperial College London, the von Neumann Institute for Computing at Forschungszentrum Jülich, and the Perimeter Institute for Theoretical Physics, where she organized and ran the first complex systems and statistical physics program.
 Paczuski was married to the late Danish theoretical physicist Per Bak, with whom she has coauthored papers.
Dorthe Dahl-Jensen (born 8 September 1958, Copenhagen, Denmark) is a Danish palaeoclimatology professor and researcher at the Centre for Ice and Climate at the Niels Bohr Institute, University of Copenhagen in Denmark.
 Her primary field is the study of ice and climate, specifically the reconstruction of climate records from ice cores and borehole data; ice flow models to date ice cores; continuum mechanical properties of anisotropic ice; ice in the solar system; and the history and evolution of the Greenland Ice Sheet.

Question: Which did inventor Borge Bak study at the university of Copenhagen?
Answer: Spectroscopy