Photo-excited desorption of multi-component systems: Application to chalcogenide glasses

• Published in: Applied surface science Vol. 248; no. 1; pp. 224 - 230
• Main Authors: Mihesan, C., Gurlui, S., Ziskind, M., Chazallon, B., Martinelli, G., Zeghlache, H., Guignard, M., Nazabal, V., Smektala, F., Focsa, C.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 30.07.2005; Elsevier Science
• Subjects: Analytical chemistry; Chalcogenide; Chemistry; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electron and ion emission by liquids and solids; impact phenomena; Exact sciences and technology; Impact phenomena (including electron spectra and sputtering); Laser desorption; Multi-component systems; Photon- and electron-stimulated desorption; Physics; Spectrometric and optical methods; Chalcogenide; 68.43.Tj; 77.84.Bw; Multi-component systems; Laser desorption; 82.80.Rt; Shell models; 82.80.Rt Chalcogenide; Time-of-flight method; Velocity distribution; Multiphoton ionization; Mass spectra; Chalcogenide glasses
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2005.03.015

This work presents a laser desorption study of Ga 5Ge 20Sb 10S 65 chalcogenide glasses. The desorption products have been analyzed by UV multi-photon ionization and time-of-flight mass spectrometry. Desorption mechanisms and plume dynamics have been investigated by studying the desorption products velocity distribution profiles in the frame of a Knudsen layer model. A peculiar behavior (broadening of the mass spectral lines) of the Ga component was found at high desorption–ionization delays and a tentative explanation has been proposed, based on the very different thermal properties of the sample constituents.