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Titolo:
INFLUENCE OF ION ACTIVATION AND THERMALIZATION EFFECTS ON REACTION-RATE CONSTANTS IN A QUADRUPOLE ION-TRAP MASS-SPECTROMETER
Autore:
LIERE P; STEINER V; JENNINGS KR; MARCH RE; TABET JC;
Indirizzi:
UNIV PARIS 06,LAB CHIM STRUCT ORGAN & BIOL,4 PL JUSSIEU F-75252 PARIS05 FRANCE UNIV PARIS 06,LAB CHIM STRUCT ORGAN & BIOL F-75252 PARIS 05 FRANCE UNIV WARWICK,DEPT CHEM COVENTRY CV4 7AL W MIDLANDS ENGLAND TRENT UNIV,DEPT CHEM PETERBOROUGH ON K9J 7B8 CANADA
Titolo Testata:
International journal of mass spectrometry and ion processes
, volume: 167, anno: 1997,
pagine: 735 - 751
SICI:
0168-1176(1997)167:<735:IOIAAT>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOLECULE REACTIONS; GAS-PHASE; KINETIC METHOD; ENERGY; DISSOCIATION; COLLISIONS; SYSTEM; OXIDE;
Keywords:
ION TRAP MASS SPECTROMETRY; ION-MOLECULE REACTION; INTERNAL ENERGY; RATE CONSTANT; P-SUBSTITUTED BUTYLBENZENE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
46
Recensione:
Indirizzi per estratti:
Citazione:
P. Liere et al., "INFLUENCE OF ION ACTIVATION AND THERMALIZATION EFFECTS ON REACTION-RATE CONSTANTS IN A QUADRUPOLE ION-TRAP MASS-SPECTROMETER", International journal of mass spectrometry and ion processes, 167, 1997, pp. 735-751

Abstract

The insertion of a 'cooling' time period following ionization in a quadrupole ion trap mass spectrometer, so as to cool ion spatial and kinetic energy distributions, also presents an opportunity for ion-molecule reactions to occur. We report here on the observation of such reactions between the m/z 91 and m/z 92 fragment ions from butylbenzene andparent molecules. The measured rate constants for these reactions arerelatively low and do not influence unduly the estimation of precursor ion internal energy from the intensity ratio of these fragment ions. The values of these reaction rate constants can be changed by variation of experimental parameters, they can be enhanced by increasing the helium pressure (leading to kinetic energy thermalization) and by decreasing the reactant ion q(z) trapping parameter. Both an increase and decrease of the rate constant was observed for the charge exchange reactions of an ion of the m/z 78 benzene molecular ion with butylbenzeneand of the m/z 134 butylbenzene molecular ion witn p-butylaniline as the cooling period duration was varied. The effect of reaction exothermicity on the magnitude of the rate constant for a series of charge exchange reactions of the m/z 134 butylbenzene molecular ion with substituted butylbenzenes has been explored. The results have been rationalized on the basis of the average dipole orientation treatment of the ion-dipole complex theory. The quasi-equilibrium theory has been used toaccount for the influence of ion internal energy on the reaction rateconstant. (C) 1997 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 10:18:40