%0 Journal Article %1 Owega:1998p3637 %A Owega, S %A Lai, EPC %A Mullett, WM %D 1998 %J Journal of Photochemistry and Photobiology a-Chemistry %K Ablation, Cationization Chemical Chemical-Ionization, Chromium Cluster Desorption Electronic Excitation Film Formation, Gas-Phase Ionization, Isolation, Laser Mass Mass-Spectrometry, Matrix Mechanism, Metal-Ion, Molecules, Plasmon Polyethers, Reactions, Resonance, Silver Spectrometry, Substrate, Surface Thermal-Desorption, Time-Of-Flight %N 2 %P 123--135 %T Laser desorption ionization of gramicidin S on thin silver films with matrix isolation in surface plasmon resonance excitation %U http://www.google.com/search?client=safari&rls=en-us&q=Laser+desorption+ionization+of+gramicidin+S+on+thin+silver+films+with+matrix+isolation+in+surface+plasmon+resonance+excitation&ie=UTF-8&oe=UTF-8 %V 119 %X Laser desorption ionization (LDI)/laser ablation (LA) time-of-flight mass spectrometry (TOFMS) studies are performed via back-illumination on thin silver films deposited with gramicidin S, a cyclic decapeptide (1141 Da). Experimental results indicate an electronic excitation mechanism at low laser fluences and a thermal process at high laser fluences. In a perpendicular orientation of the thin silver film with respect to the drift tube axis, better success of chemical ionization (CI) of neutral silver atoms/clusters and gramicidin S molecules by Ag+ monomer cations within the ablation plume is evident. When these LDI/LA studies are repeated under surface plasmon resonance (SPR) conditions, the neutral atoms/clusters/molecules undergo SPR LDI/LA via a different laser energy transfer process compared to direct LDI/LA. These results also indicate an electronic excitation mechanism, only with a lower laser fluence requirement. Upon addition of a matrix, 2,5-dihydroxybenzoic acid (DHB), CI of gramicidin S molecules by Agi monomer cations is hindered while the CI of gramicidin S molecules by Na+ cations can occur at an even lower laser fluence. Thus, SPR LDI/LA with matrix isolation is an excellent technique for the mass analysis of gramicidin S. (C) 1998 Elsevier Science S.A. All rights reserved.

@article{Owega:1998p3637, abstract = {Laser desorption ionization (LDI)/laser ablation (LA) time-of-flight mass spectrometry (TOFMS) studies are performed via back-illumination on thin silver films deposited with gramicidin S, a cyclic decapeptide (1141 Da). Experimental results indicate an electronic excitation mechanism at low laser fluences and a thermal process at high laser fluences. In a perpendicular orientation of the thin silver film with respect to the drift tube axis, better success of chemical ionization (CI) of neutral silver atoms/clusters and gramicidin S molecules by Ag+ monomer cations within the ablation plume is evident. When these LDI/LA studies are repeated under surface plasmon resonance (SPR) conditions, the neutral atoms/clusters/molecules undergo SPR LDI/LA via a different laser energy transfer process compared to direct LDI/LA. These results also indicate an electronic excitation mechanism, only with a lower laser fluence requirement. Upon addition of a matrix, 2,5-dihydroxybenzoic acid (DHB), CI of gramicidin S molecules by Agi monomer cations is hindered while the CI of gramicidin S molecules by Na+ cations can occur at an even lower laser fluence. Thus, SPR LDI/LA with matrix isolation is an excellent technique for the mass analysis of gramicidin S. (C) 1998 Elsevier Science S.A. All rights reserved.}, added-at = {2010-06-22T19:38:37.000+0200}, affiliation = {Carleton Univ, Ottawa Carleton Chem Inst, Dept Chem, Ottawa, ON K1S 5B6, Canada}, author = {Owega, S and Lai, EPC and Mullett, WM}, biburl = {https://www.bibsonomy.org/bibtex/2eb00c52bd9019392b7181931e63e9a16/gsmith}, date-added = {2010-05-06 10:54:32 -0400}, date-modified = {2010-05-06 10:54:58 -0400}, interhash = {a9dee9e76864eabcf53670ae7be58671}, intrahash = {eb00c52bd9019392b7181931e63e9a16}, journal = {Journal of Photochemistry and Photobiology a-Chemistry}, keywords = {Ablation, Cationization Chemical Chemical-Ionization, Chromium Cluster Desorption Electronic Excitation Film Formation, Gas-Phase Ionization, Isolation, Laser Mass Mass-Spectrometry, Matrix Mechanism, Metal-Ion, Molecules, Plasmon Polyethers, Reactions, Resonance, Silver Spectrometry, Substrate, Surface Thermal-Desorption, Time-Of-Flight}, language = {English}, local-url = {file://localhost/Users/geoffreysmith/Documents/Papers/Journal%20of%20Photochemistry%20and%20Photobiology%20a-Chemi.../1998/Journal%20of%20Photochemistry%20and%20Photobiology%20a-Chemistry,%20119,%20123-135%201998.pdf}, month = Jan, number = 2, pages = {123--135}, pmid = {000077545400008}, rating = {0}, timestamp = {2010-06-22T19:38:40.000+0200}, title = {Laser desorption ionization of gramicidin S on thin silver films with matrix isolation in surface plasmon resonance excitation}, uri = {papers://E88B624E-D406-46FF-9D95-BB9C1AAE3FDC/Paper/p3637}, url = {http://www.google.com/search?client=safari&rls=en-us&q=Laser+desorption+ionization+of+gramicidin+S+on+thin+silver+films+with+matrix+isolation+in+surface+plasmon+resonance+excitation&ie=UTF-8&oe=UTF-8}, volume = 119, year = 1998 }