Affiliation:
1. Institute of Microelectronics Technology and High Purity Materials RAS
2. OOO NTF «ASD»
3. OOO «SOKOLOV»
Abstract
A routine linear and 2D scanning procedure using the inductively coupled plasma mass spectrometry with laser ablation (LA-ICP-MS) is often used when studying the composition of zonal and polyphase solid objects (crystals, rocks, alloys, etc.). However, the proper interpretation of the data necessitates taking into account the features inherent to the procedure. One of the most important features of the results obtained for the objects contrasting in composition is the asymmetry of the concentration profile of elements when going from high to low and, to a lesser extent, when going from low to high contents. Physical processes accompanying the analysis of rocks with the aforementioned features are considered. The duration of the time of signal distortion upon change of one crystal phase to another at large differences in the content of elements is estimated. To obtain the correct data for linear and 2D scanning using LA-ICP-MS, the scanning should be performed point by point: to avoid the influence of crater effects, points should be spaced 1.5 – 2.0 laser beam diameter apart. The goal of obtaining of reliable results requires also keeping the time intervals between measurements of at least 2 – 5 sec.
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