Microscopic cluster formation during the laser desorption of chrysene-d12

Steven M. Hankin, Phillip John

Research output: Contribution to journalArticle

Abstract

The laser ablation of chrysene-d12 has been investigated by laser desorption/post-ionization time-of-flight mass spectrometry (L2ToFMS). The early stages of plume expansion were probed by locating the focus of the post-ionization laser to within 50 µm of the surface. A spatial and temporal study of the desorption plume was carried out by recording positive ion time-of-flight mass spectra as a function of delay time and position. When the ionization laser focus was moved to within 50 µm of the surface, the appearance of the chrysene-d12 parent ion signals changed from being sharply defined with a mass resolution of ~700 to broad signals of reduced intensity and a significantly lower resolution. Furthermore, the broad ionization signals were observed at longer delay times on increasing the desorption laser power. We attribute the observed phenomena to the laser desorption of molecular clusters, their transient survival, and ultimate evaporation to discrete molecules. © 1999 American Chemical Society.

Original languageEnglish
Pages (from-to)4566-4569
Number of pages4
JournalJournal of Physical Chemistry B
Volume103
Issue number22
Publication statusPublished - 3 Jun 1999

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desorption
ionization
lasers
plumes
time lag
molecular clusters
positive ions
mass spectra
laser ablation
mass spectroscopy
recording
evaporation
expansion
molecules
ions

Cite this

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title = "Microscopic cluster formation during the laser desorption of chrysene-d12",
abstract = "The laser ablation of chrysene-d12 has been investigated by laser desorption/post-ionization time-of-flight mass spectrometry (L2ToFMS). The early stages of plume expansion were probed by locating the focus of the post-ionization laser to within 50 µm of the surface. A spatial and temporal study of the desorption plume was carried out by recording positive ion time-of-flight mass spectra as a function of delay time and position. When the ionization laser focus was moved to within 50 µm of the surface, the appearance of the chrysene-d12 parent ion signals changed from being sharply defined with a mass resolution of ~700 to broad signals of reduced intensity and a significantly lower resolution. Furthermore, the broad ionization signals were observed at longer delay times on increasing the desorption laser power. We attribute the observed phenomena to the laser desorption of molecular clusters, their transient survival, and ultimate evaporation to discrete molecules. {\circledC} 1999 American Chemical Society.",
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Microscopic cluster formation during the laser desorption of chrysene-d12. / Hankin, Steven M.; John, Phillip.

In: Journal of Physical Chemistry B, Vol. 103, No. 22, 03.06.1999, p. 4566-4569.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Microscopic cluster formation during the laser desorption of chrysene-d12

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AU - John, Phillip

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AB - The laser ablation of chrysene-d12 has been investigated by laser desorption/post-ionization time-of-flight mass spectrometry (L2ToFMS). The early stages of plume expansion were probed by locating the focus of the post-ionization laser to within 50 µm of the surface. A spatial and temporal study of the desorption plume was carried out by recording positive ion time-of-flight mass spectra as a function of delay time and position. When the ionization laser focus was moved to within 50 µm of the surface, the appearance of the chrysene-d12 parent ion signals changed from being sharply defined with a mass resolution of ~700 to broad signals of reduced intensity and a significantly lower resolution. Furthermore, the broad ionization signals were observed at longer delay times on increasing the desorption laser power. We attribute the observed phenomena to the laser desorption of molecular clusters, their transient survival, and ultimate evaporation to discrete molecules. © 1999 American Chemical Society.

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