Abstract

In FT-ICR spectroscopy it is often desirable to be able to determine ion abundances from the heights of small spectral peaks in the presence of substantial noise. When magnitude-mode transforms are used, the noise gives an apparent baseline shift, and it may be thought appropriate to measure peak heights from this apparent baseline. It is shown here that such a noise correction procedure is inappropriate, and that the peak heights measured from the original, noise-free baseline to the tops of the smoothed peaks give an excellent approximation to the true peak heights. Correction factors for peaks heights are given, which become significant at signal-to-noise ratios below about 3 and which may be useful when spectral accumulation is performed in the frequency domain.

Frequency tuning of perceptual templates changes with noise magnitude

Craig K. Abbey and Miguel P. Eckstein
J. Opt. Soc. Am. A 26(11) B72-B83 (2009)

Baseline correction for Raman spectra using a spectral estimation-based asymmetrically reweighted penalized least squares method

Yixin Guo, Weiqi Jin, Weilin Wang, Yuqing He, and Su Qiu
Appl. Opt. 62(18) 4766-4776 (2023)

Determination of line parameters from FTS spectra

V. Dana and A. Valentin
Appl. Opt. 27(21) 4450-4453 (1988)

Noise characterization of mode-locked lasers by comparing the power spectra of the fundamental and second-harmonic pulses

Yong Wang, L. P. Chen, and J. M. Liu
Opt. Lett. 20(20) 2117-2119 (1995)

Magnitude and phase photoacoustic spectra of chrysotile asbestos, a powdered sample

L. Bertrand, J.-P. Monchalin, and F. Lepoutre
Appl. Opt. 21(2) 248-252 (1982)