A Study of the Interaction between the HOO radical and some small Molecules

Thomas Svensson

Research output: ThesisDoctoral Thesis (compilation)

Abstract

The HOO radical is a key intermediate in the atmosphere and is involved in a large number of reactions, including ozone loss cycles in the stratosphere and oxidation processes in the troposphere.

This theses is a study of the HOO radical and its interactions with a number of small molecules that are present in the atmosphere. The HOO complexes were formed on the surface of growing argon matrices at 17 K. They were identified with FTIR spectroscopy in the mid infrared region utilizing H to D spectral shifts, concentration dependencies and photolysis experiments. In some of the spectra there were large amounts of potentially interesting non-identified bands. In order to assign the bands to common species statistical methods were used. Correlation coefficients were estimated between decay or growth curves from photolysis experiments and principal component analysis was performed on data matrices of the spectra.

The infrared spectra of the identified complexes were compared with spectra of related complexes in the literature. From the shifts of the vibrational fundamentals, structures of the HOO complexes are discussed. The results from the spectroscopic measurements were compared with results from ab initio calculations. There is good accordance between the results.

The HOO radical tends to form cyclic structures, which were observed with ClO2, CO, CO2 and SO2. The HOO radical is non-linear and when possible acts as a lone pair donor in the terminal oxygen and simultaneously forms a hydrogen bond.
Original languageEnglish
QualificationDoctor
Awarding Institution
  • Chemical Physics
Supervisors/Advisors
  • [unknown], [unknown], Supervisor, External person
Award date2001 Jan 26
Publisher
ISBN (Print)91-628-4596-9
Publication statusPublished - 2001

Bibliographical note

Defence details

Date: 2001-01-26
Time: 13:15
Place: hall C, Chemical Center, Lund

External reviewer(s)

Name: Nielsen, Claus Jorgen
Title: Professor
Affiliation: University of Oslo, Norway

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Article: Infrared Spectroscopic and ab Initio Study of HOOClO2Svensson, T., Nelander, B., Bernhardsson, A., Karlström, G.Journal of Physical Chemistry A 103 (1999) 4432

Article: The HOO complexes with N2 and CO in argon matricesSvensson, T., Nelander, B.Chemical Physics 262 (2000) 445

Article: The HOOO radical. A matrix isolation studyNelander, B., Engdahl, A., Svensson, T.Chemical Physics Letters, accepted for publication (2000)

Article: The CO2 complexes with HOO and HO in argon matricesSvensson, T., Nelander, B., Karlström, G.Chemical Physics, submitted (2000)

Article: The HOO complex with SO2Svensson, T.Chemical Physics, submitted (2000)


The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Chemical Physics (S) (011001060)

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics

Free keywords

  • Fysikalisk kemi
  • Physical chemistry
  • ab initio
  • peroxy radical
  • molecular interactions
  • matrix isolation
  • FTIR
  • infrared
  • Chemistry
  • Kemi

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