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Assessment of transitions in Iinduced by a green and a red fix-frequency He-Ne laser
Umeå University, Faculty of Science and Technology, Department of Physics.
2016 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The aim of this thesis is to use laser-induced fluorescence (LIF) spectroscopy to find the possible transitions of Iodine molecule which can be induced by a green or a red Helium-Neon (He-Ne) laser. By simulating all of the possible absorption transitions that a laser can induce, the possible lower and higher energy levels can be found. Then, by simulating and comparing the fluorescence emissions from each of the higher states to the measured fluorescence spectra obtained from the experiment, the correct laser induced transition(s) can be found. We found that the green He-Ne laser can induce a transition from v''=0,  J''=108 to v'=27,  J'=109, and the red He-Ne laser can induce two transitions from v''=3,  J''=34 to v´=6,  J'=33, and v''=5,  J''=129 to v'=11, J'=130. The main error source is considered to be the inaccuracies in the constants and also approximations that we use to simulate the possible transitions, in addition to the extrapolation in the calibration of the spectrometer.

Place, publisher, year, edition, pages
National Category
Atom and Molecular Physics and Optics
URN: urn:nbn:se:umu:diva-122053OAI: diva2:936858
Subject / course
Fysik C - Examensarbete
Available from: 2016-06-14 Created: 2016-06-14 Last updated: 2016-06-14Bibliographically approved

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