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Identifier

000457145

Title

Photodissociation of CH2Br2 and CHBr3 at 193 nm

Alternative Title

Φωτοδιάσπαση των CH2Br2 & CHBr3 στα 193 nm

Author

Μπανούτσος, Απόστολος Ν.

Thesis advisor

Ρακιτζής, Πέτρος

Reviewer

Κομίνης, Ιωάννης
Σαμαρτζής, Πέτρος

Abstract

The photodissociation of halogen-containing molecules, especially those containing Cl and Br, has received the attention of scientists due to the role these species play in stratospheric ozone depletion. Bromine is said to be 40 times more effective than chlorine on the destruction of ozone. In this master’s thesis, I present results on the photodissociation dynamics of CHBr₃ and CH₂Br₂ at 193 nm using the Velocity Map Imaging technique. Werecorded images of C⁺, CH⁺, CH⁺₂, Br⁺, CH₂Br⁺ and CH₂Br⁺₂ for dibromomethane and H⁺, C⁺, CH⁺, Br⁺, CBr⁺, CHBr⁺₂ and CHBr+₂ for bromoform. By analyzing the kinetic energy release of the photofragments, we were able to identify the most probable dissociation channels for both molecules. The first chapter introduces the molecular dynamics field, as well as fundamental theory for the photodissociation of molecules and the Velocity Map Imaging technique. The second chapter contains the experimental setup that we utilized. In the third and fourth chapters, I present the results of the photodissociation of dibromomethane and bromoform with an ArF excimer laser, i.e. the KER distributions of the ions and the most probable processes and channels.

Language

English

Subject

Physical chemistry

Velocity map imaging

Φυσικοχημεία

Χαρτογράφηση ταχυτήτων

Issue date

2023-07-28

Collection

School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses

Type of Work--Post-graduate theses