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Thermal desorption characteristics of ammonium nitrate and potassium perchlorate inorganic salts using particle mapping time‐of‐flight secondary ion mass spectrometry
Author(s) -
Muramoto Shin
Publication year - 2017
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6077
Subject(s) - desorption , potassium perchlorate , chemistry , mass spectrometry , thermal desorption , analytical chemistry (journal) , secondary ion mass spectrometry , static secondary ion mass spectrometry , particle (ecology) , ammonium nitrate , ammonium perchlorate , ion , potassium , particle size , perchlorate , time of flight mass spectrometry , inorganic chemistry , thermal desorption spectroscopy , chromatography , adsorption , organic chemistry , thermal decomposition , oceanography , ionization , geology
To help optimize ion mobility spectrometry (IMS) for the detection of inorganic explosives, time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS) was used to study the thermal desorption behavior of ammonium nitrate (NH 4 NO 3 ) and potassium perchlorate (KClO 4 ) particles on surface. This was carried out by ToF‐SIMS chemical imaging analysis to identify the change in the number of particles and their size before and after exposure to desorption temperatures of 150, 200, 250, 300, 350 and 400 °C for durations of 3, 6, 9 and 12 s. It was found that particles less than 7.2 µm in diameter contributed to more than 50% of both the number and mass of the particles desorbed from the surface. Combining ToF‐SIMS particle mapping with the vapor collection experiment revealed that the technique could be used also to determine the optimum desorption temperatures of explosive particles; this was found to be approximately 200 and 300 °C for NH 4 NO 3 and KClO 4 particles, respectively. Although work remains to validate this number for KClO 4 , experiments using variable desorption temperature IMS suggest the optimum temperature of NH 4 NO 3 desorption to be approximately 200 °C. Published 2016. This article is a U.S. Government work and is in the public domain in the USA