Multiphoton resonance ionization of molecules desorbed from surfaces by ion beams

Nicholas Winograd, D. M. Hrubowchak, M. H. Ervin, M. C. Wood

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

It is known that high molecular weight, thermally labile molecules can be desorbed intact using keV ion beams. This knowledge has led to numerous applications of fast atom bombardment (FAB) and secondary ion mass spectrometry (SIMS) by mass spectrometric detection of the desorbed ions. Here we show that these measurements can be significantly enhanced by using resonance enhanced laser ionization to softly ionize the neutral component of the desorbed flux. This experimental configuration can produce sensitivity improvements of several orders of magnitude over SIMS while adding a certain degree of selectivity to the ionization process itself. Examples of this performance will be presented using a wide variety of molecules including aromatic hydrocarbons, a number of biologically relevant compounds and organic polymer substrates. In some cases, detection limits in the attomole range can be achieved.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherPubl by Int Soc for Optical Engineering
Pages2-11
Number of pages10
ISBN (Print)0819405256
Publication statusPublished - Jan 1 1991
EventOptical Methods for Ultrasensitive Detection and Analysis: Techniques and Applications - Los Angeles, CA, USA
Duration: Jan 21 1991Jan 23 1991

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume1435
ISSN (Print)0277-786X

Other

OtherOptical Methods for Ultrasensitive Detection and Analysis: Techniques and Applications
CityLos Angeles, CA, USA
Period1/21/911/23/91

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Winograd, N., Hrubowchak, D. M., Ervin, M. H., & Wood, M. C. (1991). Multiphoton resonance ionization of molecules desorbed from surfaces by ion beams. In Proceedings of SPIE - The International Society for Optical Engineering (pp. 2-11). (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 1435). Publ by Int Soc for Optical Engineering.