Anomalous Current Peaks in the I-V Characteristic for Tunneling Between Two Superconductors
Abstract : A study was made of the two-superconductor tunneling characteristics of sandwiches of Nb-Nb Oxide-In. Observation was of not only the dc Josephson effect (a zerovoltage tunneling supercurrent), but also, at finite voltages, dc current peaks of comparable magnitude. A similar effect has been seen in junctions exhibiting dc zerovoltage currents apparently due to low critical current superconducting shorts.
Abstract The feasibility of making analytical atomic spectrometry measurements by inductively coupled plasma-Fourier transform spectrometry (ICP-FTS) is demonstrated. Analytical working curves and detection limits are presented for Al, Ni, Fe and Ca. The effects of sample matrix composition on detection limits for analytical ICP-FTS are investigated. It is shown that a multiplex disadvantage may occur in the case of a spectral bandpass encompassing stroog emission lines of a matrix element. A “worse case” example of this problem is presented. Possible approaches to overcoming the multiplex disadvantage in analytical ICP-FTS and some ideal criteria for ICP-FTS instrumentation are presented.