@article {422,
	title = {Matrix methods for the calculation of stability diagrams in quadrupole mass spectrometry},
	journal = {Journal of the American Society for Mass Spectrometry},
	volume = {13},
	number = {6},
	year = {2002},
	note = {ISI Document Delivery No.: 557DZTimes Cited: 24Cited Reference Count: 47},
	month = {Jun},
	pages = {597-613},
	type = {Article},
	abstract = {The theory of the computer calculation of the stability of ion motion in periodic quadrupole fields is considered. A matrix approach for the numerical solution of the Hill equation and examples of calculations of stability diagrams are described. The advantage of this method is that it can be used for any periodic waveform. The stability diagrams with periodic rectangular waveform voltages are calculated with this approach. Calculations of the conventional stability diagram of the 3-D ion trap and the first six regions of stability of a mass filter with this method are presented. The stability of the ion motion for the case of a trapping voltage with two or more frequencies is also discussed. It is shown that quadrupole excitation with the rational angular frequency omega = NOmega/P (where N, P are integers and Omega is the angular frequency of the trapping field) leads to splitting of the stability diagram along iso-P lines. Each stable region of the unperturbed diagram splits into P stable bands. The widths of the unstable resonance lines depend on the amplitude of the auxiliary voltage and the frequency. With a low auxiliary frequency splitting of the stability diagram is greater near the boundaries of the unperturbed diagram. It is also shown that amplitude modulation of the trapping RF voltage by an auxiliary signal is equivalent to quadrupole excitation with three frequencies. The effect of modulation by a rational frequency is similar to the case of quadrupole excitation, although splitting of the stability diagram differs to some extent. The methods and results of these calculations will be useful for studies of higher stability regions, resonant excitation, and non-sinusoidal trapping voltages. (J Am Soc Mass Spectrom 2002, 13, 597-613) (C) 2002 American Society for Mass Spectrometry.},
	keywords = {CLOUD, EXCITATION, FILTER, FREQUENCY, HIGH-RESOLUTION, ION-TRAP, OPERATION, PARAMETRIC RESONANCES, PAUL TRAP, REGION},
	isbn = {1044-0305},
	url = {<Go to ISI>://000175893800003},
	author = {Konenkov, N. V. and Sudakov, M. and Douglas, D. J.}
}
@article {3891,
	title = {(2)Pi-(X)over-tilde(2)Sigma(+) electronic bands of titanium methylidyne, TiCH, near 725 nm wavelength},
	journal = {Journal of Molecular Spectroscopy},
	volume = {181},
	number = {1},
	year = {1997},
	note = {ISI Document Delivery No.: WA945Times Cited: 24Cited Reference Count: 27},
	month = {Jan},
	pages = {168-179},
	type = {Article},
	abstract = {Electronic bands assigned to the linear TiCH and TiCD radicals have been recorded by laser-induced fluorescence in the 610-725 nm wavelength region, following the reaction of laser-ablated Ti atoms with methane under supersonic jet-cooled molecular beam conditions. Rotational analyses of high-resolution spectra have given the ground state substitution structure X(2) Sigma(+): r(g)(C-H) = 1.085 +/- 0.002 Angstrom: r(g)(Ti-C) = 1.7277 +/- 0.0003 Angstrom. The electronic upper state appears to be a very strongly perturbed (2) Pi start, with many extra rotational and vibrational levels appearing; it has nor barn possible to make vibrational assignments, though the Omega{\textquoteright} values have been established for some of the levels. Wavelength-resolved fluorescence spectra have given two of the three ground state vibrational frequencies: TiCH: nu(2)(bend) = 578 cm(-1), nu(3)(Ti-C stretch) = 855 cm(-1) TiCD: nu(2) = 442 cm(-1), nu(3) = 815 cm(-1) Vibrationally forbidden transitions to the ground state bending fundamental appear prominently in many of these spectra, as a result of strong vibronic coupling. No evidence for nu(1)(pi) (the C-Il stretching vibration) has been found. (C) 1997 Academic Press, Inc.},
	keywords = {EXCITATION SPECTRUM, FLUORESCENCE, FREQUENCY, MONOXIDE, PERTURBATIONS, RESONANCE, SPECTROSCOPY, STATES, SYSTEM},
	isbn = {0022-2852},
	url = {<Go to ISI>://A1997WA94500020},
	author = {Barnes, M. and Merer, A. J. and Metha, G. F.}
}
