Desorption Dynamics, Internal Energies and Imaging of Organic Molecules from Surfaces with Laser Desorption and Vacuum Ultraviolet (VUV) Photoionization

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There is enormous interest in visualizing the chemical composition of organic material that comprises our world. A convenient method to obtain molecular information with high spatial resolution is imaging mass spectrometry. However, the internal energy deposited within molecules upon transfer to the gas phase from a surface can lead to increased fragmentation and to complications in analysis of mass spectra. Here it is shown that in laser desorption with postionization by tunable vacuum ultraviolet (VUV) radiation, the internal energy gained during laser desorption leads to minimal fragmentation of DNA bases. The internal temperature of laser-desorbed triacontane molecules approaches 670 K, ... continued below

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Kostko, Oleg; Takahashi, Lynelle K. & Ahmed, Musahid April 5, 2011.

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There is enormous interest in visualizing the chemical composition of organic material that comprises our world. A convenient method to obtain molecular information with high spatial resolution is imaging mass spectrometry. However, the internal energy deposited within molecules upon transfer to the gas phase from a surface can lead to increased fragmentation and to complications in analysis of mass spectra. Here it is shown that in laser desorption with postionization by tunable vacuum ultraviolet (VUV) radiation, the internal energy gained during laser desorption leads to minimal fragmentation of DNA bases. The internal temperature of laser-desorbed triacontane molecules approaches 670 K, whereas the internal temperature of thymine is 800 K. A synchrotron-based VUV postionization technique for determining translational temperatures reveals that biomolecules have translational temperatures in the range of 216-346 K. The observed low translational temperatures, as well as their decrease with increased desorption laser power is explained by collisional cooling. An example of imaging mass spectrometry on an organic polymer, using laser desorption VUV postionization shows 5 mu m feature details while using a 30 mu m laser spot size and 7 ns duration. Applications of laser desorption postionization to the analysis of cellulose, lignin and humic acids are briefly discussed.

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  • Journal Name: Chemistry an Asian Journal; Journal Volume: 6; Journal Issue: 11

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  • Report No.: LBNL-4658E
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1002/asia.201100419 | External Link
  • Office of Scientific & Technical Information Report Number: 1023405
  • Archival Resource Key: ark:/67531/metadc829419

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • April 5, 2011

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  • May 19, 2016, 3:16 p.m.

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  • July 26, 2016, 3:50 p.m.

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Kostko, Oleg; Takahashi, Lynelle K. & Ahmed, Musahid. Desorption Dynamics, Internal Energies and Imaging of Organic Molecules from Surfaces with Laser Desorption and Vacuum Ultraviolet (VUV) Photoionization, article, April 5, 2011; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc829419/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.