Unimolecular dissociation rate constants: Chlorobenzene cations revisited by using a new method
- Pennsylvania State Univ., University Park (USA)
Unimolecular dissociation rates of metastable molecular ions formed at the laser focus of a time-of-flight mass spectrometer (TOFMS) have been determined by measuring the relative concentrations of parent metastable ions and the daughter fragment ions as a function of their retained kinetic energies upon dissociation. This is accomplished by the use of a simple one-stage ion mirror/energy analyzer. For a given reflection potential on the ion mirror, only those ions with a kinetic energy equal to or less than the reflection potential are detected. In this way, the relative concentrations of the parent and daughter ions as a function of their position of dissociation in the time-of-flight (TOF) lens can be measured, and consequently the dissociation lifetime can be derived. This technique has been applied to measuring the unimolecular dissociation rate of chlorobenzene ion (C{sub 6}H{sub 5}Cl{sup +}) in the three-photon energy range of 13.64-13.92 eV through resonance-enhanced two-photon state-selected ionization of chlorobenzene in a supersonic molecular jet.
- DOE Contract Number:
- FG02-88ER60648
- OSTI ID:
- 6439737
- Journal Information:
- Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:9; ISSN 0022-3654; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
CHARGED PARTICLES
DATA
DATA ANALYSIS
DISSOCIATION
EXPERIMENTAL DATA
INFORMATION
IONS
KINETICS
MEASURING INSTRUMENTS
MEASURING METHODS
MOLECULAR IONS
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
REACTION KINETICS