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Assessment of excitation transitions in iodine induced by a red and a yellow HeNe laser
Umeå University, Faculty of Science and Technology, Department of Physics.
2018 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

In this experiment, fluorescence spectra of iodine induced by two fix-frequency He-Ne lasers with different wavelengths were obtained by constructing a laser induced fluorescence system. The possible theoretical transitions between the electronic ground state X1 Σg+ and the excited electronic state B3 Π0+u that are similar to the laser energy were found by simulation assuming a Morse potential for the vibrational of the molecule. By also comparing the simulated fluorescence spectrum and the measured fluorescence spectrum, the transitions which are most probably addressed by the laser can be identified. For the red He-Ne laser the transition R(78)12←6 was identified to lead to a fluorescence spectrum in good agreement with the measured spectrum. And for the yellow laser the transition R(185)17←2 was found as the most probable laser addressed transition. For the yellow laser, the fluorescence spectrum at lower wave numbers shows two additional peaks closing to the peaks identified to come from the main laser addressed level. The additional peaks might come either from an additional laser addressed level or from molecules in the excited state redistributed to another state with similar energy by collisions.

Place, publisher, year, edition, pages
2018.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-150050OAI: oai:DiVA.org:umu-150050DiVA, id: diva2:1230790
Subject / course
Fysik C - Examensarbete
Available from: 2018-07-04 Created: 2018-07-04 Last updated: 2018-07-04Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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