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Assessment of excitation transitions in iodine induced by an orange and a green HeNe laser and its dissociation energy
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]

This report describes the construction of a laser induced fluorescence(LIF) system based on a grating spectrometer to study the fluorescence spectrum of the Iodine. The measured spectrum was compared to simulated spectra to identify the laser addressed transition. Furthermore the vibrational constants and the dissociation energy of the electronic ground state was extracted using the Birge-Sponer method. For this the Iodine in vapour phase was excited by a green laser with a wavelength corresponding to 18398.7216 cm-1 and orange laser with a wavelength corresponding to 16340.6502 cm-1. For both lasers the iodine molecules were assumed to be excited from the electronic ground state, X10+g, to the excited state, B1u+. The transition energies between the two electronic states were simulated and compared with the laser photon energies to identify possible laser addressed transitions. Further comparisons with values of Doppler width and the simulated and measured rotational splitting of the transitions lead to the conclusions that the iodine is likely to be excited to the ν' = 27, J' = 108 state by the green laser and to the ν' = 9, J' = 50 state by the orange laser. By using the Birge-Sponer method, the values of 1.02 eV for D0 and 2.0 eV for De were found. These values agree within 85% with values given in the literature. The discrepancies between the measurements and simulations based on literature values can most likely be attributed to insufficiently accurate calibration of the spectrometer as well as to higher order terms neglected in the model for the vibrational potential.

Place, publisher, year, edition, pages
2018.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-150045OAI: oai:DiVA.org:umu-150045DiVA, id: diva2:1230753
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
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf