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The ion-to-neutral ratios of four commonly used solid matrices, α-cyano-4-hydroxycinnamic acid (CHCA), 2,5-dihydroxybenzoic acid (2,5-DHB), sinapinic acid (SA), and ferulic acid (FA) in matrix-assisted laser desorption/ionization (MALDI) at 355 nm are reported. Ions are measured using a time-of-flight mass spectrometer combined with a time-sliced ion imaging detector. Neutrals are measured using a...
A fast-speed pulse detector based on Si-Schottky diode is designed in the waveguide. It is very easy to operate this detector because it dispenses with bias current & synch-pulse source. Experimental results show that the pulse response time of this detector is less than 220 ps in the Ka band. In addition, it is characterized by high sensitivity of 1.2 mV/muW. Another advantage of the detector...
A Ka-band high-speed detector based on GaAs Schottky diode is designed in hybrid integration technology. Experimental results show that the detector pulse response time is less than 300 ps; moreover, the class detector employs facility since it dispenses with bias current & synch-pulse source. The paper illustrates that the Schottky diode has a fast-speed response time.
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