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), Vol. 93:11; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

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