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Can I read Effect of Sequence Length, Sequence Frequency, and Data Acquisition Rate on the Performance of a Hadamard Transform Time-of-flight Mass Spectrometer on EtoBox?
Effect of Sequence Length, Sequence Frequency, and Data Acquisition Rate on the Performance of a Hadamard Transform Time-of-flight Mass Spectrometer by Facundo M. Fernández; José M. Vadillo; Friedrich Engelke; Joel R. Kimmel; Richard N. Zare; Nestor Rodriguez; Magnus Wetterhall; Karin Markides is a Chemistry article available to read on EtoBox.
What is Effect of Sequence Length, Sequence Frequency, and Data Acquisition Rate on the Performance of a Hadamard Transform Time-of-flight Mass Spectrometer about?
Various factors influencing the performance of a Hadamard transform time-of-flight mass spectrometer (HT-TOFMS) have been investigated. Using a nitrogen corona discharge to produce an ion stream of N 2 ϩ , N 3 ϩ , and N 4 ϩ , it is found for spectra containing only N 4 ϩ that the signal-to-noise ratio (SNR) closely approaches the value calculated from the ion background by assuming that the ion background follows a Poisson distribution. In contrast, for a more intense beam containing N 2 ϩ , N 3 ϩ , and N 4 ϩ , the SNR is less than its theoretical value because of the appearance of discrete spikes in the mass spectrum caused by deviations in the actual modulation sequence from the ideal one. These spikes can be reduced, however, by decreasing the modulation voltage. Under these optimized conditions, the pseudo-random sequence length is varied to understand how it alters SNR, mass resolution, and scan speed. When the length of the pseudo-random sequence is doubled, the SNR increases by ͌ 2 while the time necessary to record a mass spectrum also doubles. Mass resolution can be varied between 500 and 1200 at m/z ϭ 609 as the sequence length, modulation speed (10 MHz, 25 MHz), and acqu
Who reads Effect of Sequence Length, Sequence Frequency, and Data Acquisition Rate on the Performance of a Hadamard Transform Time-of-flight Mass Spectrometer?
It is typically read by researchers, students, and practitioners in Chemistry.
- Author
- Facundo M. Fernández; José M. Vadillo; Friedrich Engelke; Joel R. Kimmel; Richard N. Zare; Nestor Rodriguez; Magnus Wetterhall; Karin Markides
- Publisher
- Elsevier Science; Springer-Verlag; Springer New York LLC; American Chemical Society (ACS); Springer Science and Business Media LLC; Elsevier BV (ISSN 1044-0305)
- Published
- 2001
- Language
- EN
- Field
- Chemistry (Physical Sciences)