Pure absorption-mode spectra from Bayesian maximum entropy analysis of ion cyclotron resonance time-domain signals

1991 ◽  
Vol 63 (6) ◽  
pp. 551-560 ◽  
Author(s):  
Joseph E. Meier ◽  
Alan G. Marshall
Keyword(s):  
Maximum Entropy ◽  
Time Domain ◽  
Cyclotron Resonance ◽  
Bayesian Maximum Entropy ◽  
Ion Cyclotron Resonance ◽  
Entropy Analysis ◽  
Ion Cyclotron ◽  
Absorption Mode

Producing absorption mode Fourier transform ion cyclotron resonance mass spectra with non-quadratic phase correction functions

2015 ◽  
Vol 29 (11) ◽  
pp. 1087-1093 ◽  
Author(s):  
David P. A. Kilgour ◽  
Konstantin O. Nagornov ◽  
Anton N. Kozhinov ◽  
Konstantin O. Zhurov ◽  
Yury O. Tsybin
Keyword(s):  
Fourier Transform ◽  
Cyclotron Resonance ◽  
Mass Spectra ◽  
Phase Correction ◽  
Ion Cyclotron Resonance ◽  
Quadratic Phase ◽  
Ion Cyclotron ◽  
Absorption Mode

Absorption-mode spectra on the dynamically harmonized Fourier transform ion cyclotron resonance cell

2012 ◽  
Vol 26 (17) ◽  
pp. 2021-2026 ◽  
Author(s):  
Yulin Qi ◽  
Matthias Witt ◽  
Roland Jertz ◽  
Gökhan Baykut ◽  
Mark P. Barrow ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Cyclotron Resonance ◽  
Ion Cyclotron Resonance ◽  
Ion Cyclotron ◽  
Resonance Cell ◽  
Absorption Mode

Selective-phase Ion Cyclotron Resonance Spectroscopy

1974 ◽  
Vol 52 (10) ◽  
pp. 1997-1999 ◽  
Author(s):  
Melvin B. Comisarow ◽  
Alan G. Marshall
Keyword(s):  
Cyclotron Resonance ◽  
Signal To Noise Ratio ◽  
Broad Band ◽  
Resonance Spectroscopy ◽  
Ion Cyclotron Resonance ◽  
Linear Phase ◽  
Band Frequency ◽  
Absolute Value ◽  
Ion Cyclotron ◽  
Absorption Mode

In-phase ("dispersion"), 90° out-of-phase ("absorption"), and "absolute-value" (square root of the sum of the squares of the "absorption" and "dispersion") ion cyclotron resonance (i.c.r.) spectra of CH3+ and CH4+ have been obtained by broad-band frequency-swept r.f. irradiation of an ionized methane sample, followed by broad-band detection, digitization of the transient i.c.r. response, Fourier transformation using a digital computer (1), and application of a linear phase correction across the F.t.-i.c.r. spectrum. The "absorption" spectrum is the same as would be obtained by conventional marginal-oscillator field-sweep i.c.r. detection and provides a means for identifying spurious "foldover" peaks; the "dispersion" response is not observable with a marginal oscillator detector. The principal advantages of the new "absolute-value" display are (1) the signal-to-noise ratio is significantly better than for the conventional "absorption" mode, at the expense of a slight broadening of the i.c.r. spectral line shape; and (2) "absolute-value" display will very likely be the method of choice in frequency-sweep F.t.-i.c.r. spectroscopy (2), in order to circumvent the complicated non-linear phase corrections which may otherwise be required to obtain an "absorption" mode display.

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