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Updated: Sep 18, 2025

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
Published on: February 14, 2014
Photoelectron Spectra of Small Gallium and Aluminum Radicals
Emil Karaev1, Dorothee Schaffner1, Marius Gerlach1
1Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, Würzburg 97074, Germany.
Abstract:
We report vibrationally resolved threshold photoelectron spectra and ionization energies of the AlCH3 (7.89 ± 0.04 eV), GaCH3 (7.90 ± 0.02 eV), and GaOH (9.68 ± 0.02 eV). All molecules play a crucial role in the metal-organic vapor phase epitaxy synthesis of GaN and GaAlN thin films. To generate these reactive species, trimethylaluminum and trimethylgallium were pyrolyzed and their pyrolysis products were characterized by threshold photoelectron spectroscopy, utilizing the double imaging photoelectron photoion coincidence spectroscopy setup at the VUV beamline at the Paul Scherrer Institute. Vibrations were assigned in Franck-Condon simulations based on their computed geometries.
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