Dissociation of Molecular Ions Formed by Charge Exchange in an In‐Line Tandem Mass Spectrometer

Autor:	C. Lifshitz, T. O. Tiernan
Rok vydání:	1972
Předmět:	Fragmentation (mass spectrometry) Collision-induced dissociation Chemistry Excited state Polyatomic ion General Physics and Astronomy Ionic bonding Physics::Chemical Physics Physical and Theoretical Chemistry Atomic physics Kinetic energy Mass spectrometry Ion
Zdroj:	The Journal of Chemical Physics. 57:1515-1534
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.1678432
Popis:	Dissociations of the molecular ions of several alkanes, alcohols, and ketones, formed in charge‐exchange collisions were studied using an in‐line tandem mass spectrometer. The effects of both incident ion translational energy and collision chamber temperature upon the observed dissociations were examined. For most of the molecules investigated, the extent of fragmentation of the molecular ion increases as the kinetic energy is raised, indicating that energy is being converted from the translational modes into target excitation. The magnitude of this energy conversion seems to be rather small. Higher collision chamber temperatures also lead to more extensive fragmentation, presumably owing to increased vibrational excitation. In certain cases, notably methanol and 2‐hexanone, an increase in the translational energy of incident ions having recombination energies near the onset of known excited ionic states of these molecules results in an increase in the relative intensity of the molecular ion product. This...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0585b65a48480fce3dfb926c9fb96630 https://doi.org/10.1063/1.1678432 Zobrazit plný text záznamu