Molecular SIMS Ionization Probability Studied with Laser Postionization: Influence of the Projectile Cluster

Lars Breuer, Hua Tian, Andreas Wucher, Nicholas Winograd

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The formation probability of (quasi-)molecular secondary ions released from an organic film under bombardment with a 20 keV cluster ion beam is investigated using combined time-of-flight secondary ion and neutral mass spectrometry (ToF-SIMS/SNMS) experiments. The emitted neutral molecules are postionized after their ejection using strong-field photoionization in an intense short infrared laser pulse. Comparing the (quasi)-molecular secondary ion signal with that of the corresponding neutral molecules, the ionization probability of sputtered intact coronene and guanine molecules is determined. The results are compared between two different projectile cluster ions, namely (i) C 60 + and (ii) Ar n + with n ∼ 1000. It is shown that both projectiles deliver different SNMS spectra, indicating pronounced differences in the collision-induced fragmentation of the emitted molecules. For guanine, the ionization probability obtained with both projectiles is of the same order of magnitude (∼10 -3 ), with the fullerene cluster producing a slightly larger ionization efficiency than the rare gas cluster. For coronene, on the other hand, a substantially lower ionization efficiency is found for the gas cluster projectile.

Original languageEnglish (US)
Pages (from-to)565-574
Number of pages10
JournalJournal of Physical Chemistry C
Volume123
Issue number1
DOIs
StatePublished - Oct 1 2019

Fingerprint

Projectiles
Secondary ion mass spectrometry
secondary ion mass spectrometry
Ionization
projectiles
Ions
ionization
Molecules
Lasers
Guanine
guanines
lasers
molecules
Fullerenes
Noble Gases
ions
Photoionization
Infrared lasers
Inert gases
Ion beams

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

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title = "Molecular SIMS Ionization Probability Studied with Laser Postionization: Influence of the Projectile Cluster",
abstract = "The formation probability of (quasi-)molecular secondary ions released from an organic film under bombardment with a 20 keV cluster ion beam is investigated using combined time-of-flight secondary ion and neutral mass spectrometry (ToF-SIMS/SNMS) experiments. The emitted neutral molecules are postionized after their ejection using strong-field photoionization in an intense short infrared laser pulse. Comparing the (quasi)-molecular secondary ion signal with that of the corresponding neutral molecules, the ionization probability of sputtered intact coronene and guanine molecules is determined. The results are compared between two different projectile cluster ions, namely (i) C 60 + and (ii) Ar n + with n ∼ 1000. It is shown that both projectiles deliver different SNMS spectra, indicating pronounced differences in the collision-induced fragmentation of the emitted molecules. For guanine, the ionization probability obtained with both projectiles is of the same order of magnitude (∼10 -3 ), with the fullerene cluster producing a slightly larger ionization efficiency than the rare gas cluster. For coronene, on the other hand, a substantially lower ionization efficiency is found for the gas cluster projectile.",
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Molecular SIMS Ionization Probability Studied with Laser Postionization : Influence of the Projectile Cluster. / Breuer, Lars; Tian, Hua; Wucher, Andreas; Winograd, Nicholas.

In: Journal of Physical Chemistry C, Vol. 123, No. 1, 01.10.2019, p. 565-574.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Tian, Hua

AU - Wucher, Andreas

AU - Winograd, Nicholas

PY - 2019/10/1

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AB - The formation probability of (quasi-)molecular secondary ions released from an organic film under bombardment with a 20 keV cluster ion beam is investigated using combined time-of-flight secondary ion and neutral mass spectrometry (ToF-SIMS/SNMS) experiments. The emitted neutral molecules are postionized after their ejection using strong-field photoionization in an intense short infrared laser pulse. Comparing the (quasi)-molecular secondary ion signal with that of the corresponding neutral molecules, the ionization probability of sputtered intact coronene and guanine molecules is determined. The results are compared between two different projectile cluster ions, namely (i) C 60 + and (ii) Ar n + with n ∼ 1000. It is shown that both projectiles deliver different SNMS spectra, indicating pronounced differences in the collision-induced fragmentation of the emitted molecules. For guanine, the ionization probability obtained with both projectiles is of the same order of magnitude (∼10 -3 ), with the fullerene cluster producing a slightly larger ionization efficiency than the rare gas cluster. For coronene, on the other hand, a substantially lower ionization efficiency is found for the gas cluster projectile.

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