# International Journal of Mass Spectrometry

International Journal of Mass Spectrometry > 1998 > 176 > 1-2 > 1-12

^{-}

^{6}mol fraction) of yttrium were introduced into six H

_{2}-O

_{2}-N

_{2}flames in the temperature range 1820-2400 K at atmospheric pressure. Metallic ions were observed by sampling the flames through a nozzle into a mass spectrometer, and were measured as profiles of ion concentration vs. distance (i.e. time) along the flame axis. The ions observed...

International Journal of Mass Spectrometry > 1998 > 176 > 1-2 > 23-38

_{4}H

_{4}fragment ions from the benzene radical cation show that the dissociation of lowest energy leads to the methylene cyclopropene radical cation. The calculated barriers for formation of the other classical C

_{4}H

_{4}ion structures, vinyl acetylene, cyclobutadiene, and butatriene, are...

International Journal of Mass Spectrometry > 1998 > 176 > 1-2 > 103-111

_{n}F

^{+}

_{m}cluster ions (n = 1-3, m = 1-4) was investigated by using two different plasma mass spectrometric methods: spark source mass spectrometry and laser ablation inductively coupled plasma mass spectrometry. Both methods give similar abundance distributions of cluster ions, with a maximum ion intensity for the Ca

_{2}F

^{+}

_{3}species. These...

International Journal of Mass Spectrometry > 1998 > 176 > 1-2 > 149-159

International Journal of Mass Spectrometry > 1998 > 176 > 1-2 > 77-86

International Journal of Mass Spectrometry > 1998 > 176 > 1-2 > 87-97

International Journal of Mass Spectrometry > 1998 > 176 > 1-2 > 113-124

_{2}...

International Journal of Mass Spectrometry > 1998 > 176 > 1-2 > 63-76

_{i}) as a function of energy are shown and investigated. The η

_{i}are important quantities used to determine the...

International Journal of Mass Spectrometry > 1998 > 176 > 1-2 > 39-61

^{+}) and incorporate at least one polyether or at least one pyridyl ligand bound...

International Journal of Mass Spectrometry > 1998 > 176 > 1-2 > 125-131

International Journal of Mass Spectrometry > 1998 > 176 > 1-2 > 13-21

_{2}BO

^{+}

_{2}ions (m/z = 308 and 309) for precise boron isotope analysis has been established by employing a newly developed double collector package in the modified Finnigan-MAT 261 thermal ionization mass spectrometer (TIMS). This method reduces the data acquisition time to 5 min which is approximately one order of magnitude shorter than conventional...

International Journal of Mass Spectrometry > 1998 > 176 > 1-2 > 99-102

^{+}using a miniature mass spectrometer developed at the jet propulsion laboratory equipped with a focal plane detector developed at Aberystwyth show a large resolving power enhancement...

International Journal of Mass Spectrometry > 1998 > 176 > 1-2 > 133-148

International Journal of Mass Spectrometry > 1998 > 176 > 3 > 237-244

_{3}N

_{4}sample was irradiated with an Nd-YAG laser. The species present in the plume were detected by a quadrupole mass spectrometer (QMS). The species observed were Si, SiN, Si

_{2}, Si

_{2}N, Si

_{3}, Si

_{3}N, Si

_{4}, Si

_{3}N

_{4}, Si

_{6}, Si

_{7}, and N. Weak signals were observed at m/e = 126 and 280. The analysis of...

International Journal of Mass Spectrometry > 1998 > 176 > 3 > 167-176

_{3}O

^{+}, NO

^{+}, and O

_{2}

^{+}with eight organosulphur molecules, M. If we assume that all the exothermic proton transfer reactions of H

_{3}O

^{+}occur at the collision rate (i.e. the rate coefficients, k, are equal to the collisional rate coefficient, k

_{c}), it...

International Journal of Mass Spectrometry > 1998 > 176 > 3 > 227-235

_{3}F molecule in order to obtain dynamical information on these processes. CCl

_{3}F

^{+}produced via vertical ionization directly dissociates into CCl

_{2}F

^{+}+ Cl within a very short time. It has been found that 80% of the available energy...

International Journal of Mass Spectrometry > 1998 > 176 > 3 > 161-166

International Journal of Mass Spectrometry > 1998 > 176 > 3 > 189-201

_{2}gas, thermal electrons, and hot filament temperatures. These requirements are partly in conflict. For example, O

_{2}, essential for volatilization of refractory metals, has

_{p}oisoning effects on electron emission. Hot filament temperatures enhance reactions, but greater thermal electron emission...

International Journal of Mass Spectrometry > 1998 > 176 > 3 > 245-252

_{2}O(CH

_{3})

_{6}, which is widely used in plasma-enhanced polymerization applications. Appearance energies and absolute partial cross sections for the formation of fragment ions with relative intensities >1% of the most abundant ion, the Si

_{2}O(CH

_{3})

_{5}

^{+}fragment ion,...