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[en] Transport and recombination have been studied in samples of hydrogenated amorphous silicon through measurements of photocurrent transients in the nanosecond to millisecond time regimes. Both sample configurations suitable for time-of-flight measurements and configurations appropriate for the usual photoconductivity measurements have been employed. In principle, analysis of the experiments together permits the separation of current decreases with time caused by time-dependent mobilities from those caused by carrier loss due to deep trapping. The former involves carrier trapping which is temporary on the time scale of the experiment; the latter, trapping which removes carriers permanently, on the same time scale. The occurrence of the latter carrier loss is checked through integration of the current transient to obtain the total collected charge, with the applied electric field as a parameter
[en] Highlights: • A widely applicable Quan/Qual method using high-resolution MS is proposed. • Resolution, scan mode, scan rate and smoothing affect Quan/Qual performance. • Recommendations are provided for future Quan/Qual method development. - Abstract: BackgroundHigh-throughput simultaneous quantitative and qualitative (Quan/Qual) analysis is attractive to combine targeted with non-targeted analysis, e.g. in pharmacometabolomics and drug metabolism studies. This study aimed to investigate the possibilities and limitations of high-throughput Quan/Qual analysis by ultra-high performance liquid chromatography (UHPLC) coupled with high-resolution mass spectrometry (HRMS), to develop a widely applicable Quan/Qual UHPLC-HRMS method and to provide recommendations for Quan/Qual method development.
[en] Calibration and routine check-ups of flight time measuring systems can be carried out with the aid of defined flight time calibration spectra. This paper describes a simple flight time calibration generator capable of generating such calibration spectra in the form of line spectra or of a white spectrum. The flight time of the generator is adjustable in steps from 100 to 3,200 ns. The number of calibration lines can be set to 10 or to 20, resulting in line spacings ranging from 5 to 320 ns. The stop signals are generated by a crystal oscillator, the start signals are generated by a voltage-controlled oscillator locked in a phase control circuit. The start and stop rates can be adjusted in steps. (orig.)
[de]Die Eichung und routinemaessige Kontrolle von Flugzeit-Messeinrichtungen kann mit Hilfe von definierten Flugzeit-Eichspektren durchgefuehrt werden. Es wird ein einfacher Flugzeit-Eichgenerator beschrieben, der solche Eichspektren als Linienspektrum bzw. als weisses Spektrum erzeugt. Der Flugzeitbereich des Generators ist von 100 bis 3.200 ns stufenweise einstellbar. Die Eichlinienzahl betraegt 10 bzw. 20, so dass sich Linienabstaende zwischen 5 und 320 ns ergeben. Die Stopsignale werden aus einem Quarzoszillator und die Startsignale aus einem spannungsgesteuerten Oszillator, der in einem Phasenregelkreis liegt, abgeleitet. Die Start- und Stoprate koennen wahlweise in Stufen umgeschaltet werden. (orig.)
[en] In the article “The sTOF, a Favorable Geometry for a Time-of-Flight Analyzer”, the electric sectors in the prototype analyzer used to generate the data in Figure 4 were mistakenly listed as having a radius of 165 mm. The correct size is a diameter of 165 mm.
[en] In this paper we discuss the use of our Black Neutron Detector. We describe the shielding arrangement and the electronics. We outline the measurement procedure and show time-of-flight spectra
[en] Here, we demonstrate a coincidence velocity map imaging apparatus equipped with a novel time-stamping fast optical camera, Tpx3Cam, whose high sensitivity and nanosecond timing resolution allow for simultaneous position and time-of-flight detection. This single detector design is simple, flexible, and capable of highly differential measurements. We show detailed characterization of the camera and its application in strong field ionization experiments.