Publication Date:
2014-12-19
Description:
Publication date: February 2015 Source: Ultramicroscopy, Volume 149 Author(s): Sachin R. Suryawanshi , Pankaj S. Kolhe , Chandra S. Rout , Dattatray J. Late , Mahendra A. More Spectral analysis of the field emission (FE) current fluctuations has been carried out at the base pressure ~1×10 −8 mbar. The emission current stability investigated at preset value of 2 µA is characterized by ‘step’ like fluctuation. The spectral analysis performed on a FFT (Fast Fourier Transform) analyzer revealed that the observed noise is of 1/ f α type, with the value of α as ~1.05. The estimated value of α implies that the current fluctuations are mainly due the various processes occurring on atomic scale like adsorption, migration, and/or desorption of the residual gas species on the emitter surface. Graphical abstract
Print ISSN:
0304-3991
Topics:
Electrical Engineering, Measurement and Control Technology
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Natural Sciences in General
,
Physics
