intended, others not, sometimes giving multiple peaks at almost every nominal mass unit. This is demonstrated in Figure 711 which shows the assignment of the peak used to demonstrate the polyester in the backcoat, C8H5O3+. In this example the data is integrated over the whole 500µm square, 128 x 128 pixel dataset instead of the 32 x 128 used to construct the linescan. The information presented starts at region 6 (6x500µm) this is where the backcoat was most evident. It finishes at region 9 (9x500µm), which was obviously into the cellular region of the panel. This gives information from 2501 – 4500µm displacement on the plane of the cut surface, from an arbitrarily taken point in the zinc of the hot dipped galvanised steel. In region 6 an obvious shoulder is seen and is highlighted in red, this is reminiscent of either a charging effect or the tail often seen on a silicone molecule. By region 7 and becoming more evident as the scanned area moves further into the polyurethane a second peak becomes apparent. This second peak is identified as SiC5H13O3, a fragment from the PDMS used as a surfactant. Accuracies for both peaks are correct to within 100ppm deviation from the exact mass of fragment ion under consideration indicating an excellent level of certainty of the identity of the ions. It is evident that these peaks will influence the information gained through the imaging. Figure 711 High resolution 149u mass peak assignment; sample 3 regions 6 to 9 The ability of using the SIMS data to investigate regions of interest was further employed to investigate further the region where the backcoat to polyurethane interface should be found. Spectra from different areas of the sample surface were compared in order to monitor ions present. A region of interest was identified in the 500µm square where both ions could be seen and thus likely reveal useful information; this is shown in Figure 712, indicated by the blue arrow. In this region the line scans indicated approximately median intensities for the polyester, MDI and Catalyst ions over their area integrated 125 x 500µm RPI section.
intended, others not, sometimes giving multiple peaks at almost every nominal mass unit. This is demonstrated in Figure 711 which shows the assignment of the peak used to demonstrate the polyester in the backcoat, C8H5O3+. In this example the data is integrated over the whole 500µm square, 128 x 128 pixel dataset instead of the 32 x 128 used to construct the linescan. The information presented starts at region 6 (6x500µm) this is where the backcoat was most evident. It finishes at region 9 (9x500µm), which was obviously into the cellular region of the panel. This gives information from 2501 – 4500µm displacement on the plane of the cut surface, from an arbitrarily taken point in the zinc of the hot dipped galvanised steel. In region 6 an obvious shoulder is seen and is highlighted in red, this is reminiscent of either a charging effect or the tail often seen on a silicone molecule. By region 7 and becoming more evident as the scanned area moves further into the polyurethane a second peak becomes apparent. This second peak is identified as SiC5H13O3, a fragment from the PDMS used as a surfactant. Accuracies for both peaks are correct to within 100ppm deviation from the exact mass of fragment ion under consideration indicating an excellent level of certainty of the identity of the ions. It is evident that these peaks will influence the information gained through the imaging. Figure 711 High resolution 149u mass peak assignment; sample 3 regions 6 to 9 The ability of using the SIMS data to investigate regions of interest was further employed to investigate further the region where the backcoat to polyurethane interface should be found. Spectra from different areas of the sample surface were compared in order to monitor ions present. A region of interest was identified in the 500µm square where both ions could be seen and thus likely reveal useful information; this is shown in Figure 712, indicated by the blue arrow. In this region the line scans indicated approximately median intensities for the polyester, MDI and Catalyst ions over their area integrated 125 x 500µm RPI section.
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