Dissociation dynamics of methanol clusters following multiphoton ionization

Journal Article · Thu Jun 01 00:00:00 EDT 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100348a031· OSTI ID:6737662

Morgan, S; Castleman, Jr, A W ^[1]

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1. Pennsylvania State Univ., University Park (USA)

Following multiphoton ionization (MPI), neutral methanol clusters are found to undergo a well-known ion-molecule reaction which leads to the production of protonated clusters. Evaporative dissociation rates of the cluster ions are measured for sizes ranging from the dimer to the 21-mer following MPI. There is a general trend of the rates decreasing with time after the initial ionization event in accordance with the evaporative ensemble model. Rates measured at long times after ionization display a consistent trend of increasing with cluster size. These findings are shown to be in accord with statistical considerations of evaporative unimolecular dissociation. Collision-induced-dissociation cross sections are found to generally increase with size; the finding of a local minimum in the value for H{sup +}(CH{sub 3}OH){sub 3} is in agreement with predictions of its structure. Finally, through a combination of unimolecular evaporative and collision-induced-dissociation processes, as many as five methanol monomers are found to be lost from a cluster as small as H{sup +} (CH{sub 3}OH){sub 7}.

• OSTI ID: 6737662
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:11; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALCOHOLS
CHEMISTRY
DATA
DATA ANALYSIS
DISSOCIATION
EXPERIMENTAL DATA
HYDROXY COMPOUNDS
INFORMATION
IONIZATION
MEASURING INSTRUMENTS
MEASURING METHODS
METHANOL
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOTOCHEMISTRY