Material ejection and redeposition following atmospheric pressure near-field laser ablation on molecular solids

Liang Zhu, Gerardo Gamez Goytia, Thomas A. Schmitz, Frank Krumeich, Renato Zenobi

Research output: Contribution to journalArticlepeer-review

Abstract

Near-field laser ablation (NF-LA) coupled with mass spectrometry (MS) is very promising for highly spatially resolved chemical analyses on various substrates at atmospheric pressure, for example, in materials and life science applications. Although nanoscale sample craters can be produced routinely, no molecular mass spectra of ablated material from craters of <= 1 mu m diameter have ever been acquired by NF-LA MS at atmospheric pressure. Some of the pressing questions are thus how much of the ablated material is transported into the mass spectrometer and in what form. Therefore, material redeposition on the near-field tip’s surface from laser ablation of molecular solids was characterized with scanning electron microscopy. The crater profiles were studied by scanning probe microscopy. The results shown in this study demonstrate that there could be as much as 70% of the ablated material deposited on the near-field tip’s surface. The redeposited products were found to be confined to a
Original languageEnglish
Pages (from-to)163-172
JournalAnalytical and Bioanalytical Chemistry
StatePublished - Jan 2010

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