@article {4357,
	title = {Ion-molecule reactions of halocarbon cations with polycyclic aromatic hydrocarbons in a quadrupole ion trap - Part II - Applications to environmental analysis},
	journal = {Journal of Mass Spectrometry},
	volume = {33},
	number = {3},
	year = {1998},
	note = {ISI Document Delivery No.: ZD564Times Cited: 5Cited Reference Count: 8},
	month = {Mar},
	pages = {250-263},
	type = {Article},
	abstract = {Ion-molecule reactions between the cations CH3CHF+ and CH3CF2+ generated from 1,1-difluoroethane and gas chromatographic eluents from a sediment extract containing polycyclic aromatic hydrocarbons (PAHs) were used to differentiate goups of PAH structural isomers, Formation of specific adducts led to characteristic mass spectra for the different isomers. Differences in the ion chromatograms for M+, MH+, [M+CH3CHF](+), [M +CH3CHF-HF](+), [M+CH(3)CF2](+) and [M+CH3CF2-HF](+) (M=PAH molecule) allowed the resolution of co-eluting isomers. As the ratio of yields of adducts was not changed by methyl substitution, it was possible to differentiate and quantitate alkylated PAHs for which standards were not available, By performing a series of transformations between the ion chromatograms of the most characteristic;adducts, information on individual isomer groups could he deconvoluted from complex clusters of isomers. This ion trap/chemical ionization technique displayed calibration curse parameters similar to those for electron ionization analysis and limits of detection of 170 pg in the sediment extract. (C) 1998 John Wiley \& Sons, Ltd.},
	keywords = {environmental analysis, halocarbon cations, ion-molecule, isomer differentiation, MARINE-SEDIMENTS, polycyclic aromatic hydrocarbons, REACTIONS},
	isbn = {1076-5174},
	url = {<Go to ISI>://000072699200006},
	author = {Mosi, A. A. and Cullen, W. R. and Eigendorf, G. K.}
}
@article {4227,
	title = {Stability of a highly charged noncovalent complex in the gas phase: Holomyoglobin},
	journal = {Rapid Communications in Mass Spectrometry},
	volume = {12},
	number = {15},
	year = {1998},
	note = {ISI Document Delivery No.: 105GATimes Cited: 33Cited Reference Count: 56},
	pages = {1003-1010},
	type = {Article},
	abstract = {Gas phase holomyoglobin (hMb) ions in charge states +7 to +21 were formed by electrospray ionization in combination with a continuous-flow mixing apparatus. Collision cross section measurements show that the highly charged ions are somewhat unfolded in comparison to low charge states but still retain a considerable degree of folding. A new collision model is presented which calculates the relative energies transferred to complexes in tandem mass spectrometry. Tandem mass spectrometry and ion trapping experiments both show that the energies required to dissociate heme from the highly charged heme-protein complexes in the gas phase are similar to those of low charge states, previously shown in literature ion cyclotron resonance experiments to be 0.7-1.0 eV, These energies are comparable to those of the heme binding energy in solution. The results suggest that even for the highly charged hMb ions which have unfolded somewhat, the heme-protein interactions remain relatively unperturbed. (C) 1998 John Wiley \& Sons, Ltd.},
	keywords = {CONFORMATION, CYTOCHROME-C, ELECTROSPRAY-IONIZATION, ion-molecule, IONIZATION MASS-SPECTROMETRY, METMYOGLOBIN, MYOGLOBIN, PROTEIN IONS, PROTON-TRANSFER REACTIVITY, QUADRUPOLE, reaction},
	isbn = {0951-4198},
	url = {<Go to ISI>://000075063300003},
	author = {Chen, Y. L. and Campbell, J. M. and Collings, B. A. and Konermann, L. and Douglas, D. J.}
}
@article {4076,
	title = {Ion-molecule reactions of halocarbon cations with polycyclic aromatic hydrocarbons in a quadrupole ion trap .1. Differentiation of structural isomers},
	journal = {Journal of Mass Spectrometry},
	volume = {32},
	number = {8},
	year = {1997},
	note = {ISI Document Delivery No.: XQ564Times Cited: 9Cited Reference Count: 26},
	month = {Aug},
	pages = {864-874},
	type = {Article},
	abstract = {Ion-molecule reactions between polycyclic aromatic hydrocarbons (PAHs) and ions (R+) generated from halogenated hydrocarbons (dichloromethane, chloroform, carbon tetrachloride, 1,1-dichloroethane, difluoromethane and 1,1-difluoroethane) in a quadrupole ion trap were used to differentiate a series of structural isomers of PAHs. This differentiation was based on the formation of [M + R](+) and [M + R - HX](+) products (X = Cl, F) between the halocarbon ions (R+) and PAH molecules (M). Halomethanes were found to give rise predominantly to the elimination products [M + R - HX](+), while the haloethanes also yielded significant amounts of the [M + R](+) adducts. Differences in the ionization energies of the PAH isomers seem to be partially responsible for this differentiation process, Collision-induced dissociation experiments also revealed structural differences in the adducts of different PAH isomers. (C) 1997 by John Wiley \& Sons, Ltd.},
	keywords = {DIMETHYL ETHER, ETHER CHEMICAL-IONIZATION, GAS-PHASE, halocarbon ions, ion-molecule, IONIZATION MASS-SPECTROMETRY, isomer differentiation, polycycle aromatic hydrocarbons, quadrupole ion trap, REACTIONS},
	isbn = {1076-5174},
	url = {<Go to ISI>://A1997XQ56400009},
	author = {Mosi, A. A. and Cullen, W. R. and Eigendorf, G. K.}
}
