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problem in scanning

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we are using Multimode V (NS V). Today while scanning in tapping mode elongated features appear in one direction as shown in image attached and this continued with the change in sample and even with tip. Later Scanner was also changed and same problem appeared. we are using v 730 version of software, also we have its previous version v720. In both the softwares same problem was observed. Later it was observed that with 0 degree scan in large area i.e. 50um the relative motion of tip and sample could be seen but as soon the scan angle was changed to 90 degree there is no relative motion observed in CCD. For reference two images are attached. 

Please suggest what could be the reason for this unusual behavior? And how this can be resolved?


Need urgent help.........



SAndeep Singh

CSIR-NPL New Delhi, India


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