Collisional relaxation of photoexcited bromobenzene ions by various neutral partners

Journal Article · Wed May 27 00:00:00 EDT 1987 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00245a005· OSTI ID:6508691

Ahmed, M S; Dunbar, R C

With use of the technique of competitive collisional quenching of two-photon dissociation, the collisional quenching of photoexcited bromobenzene ions was measured for 35 neutral partners. The number of collisions required for quenching ranged from 3.5 to 180, generally increasing with molecular complexity. For quench gases not containing unsaturation or heavy atoms (except H/sub 2/O), the quenching efficiency gives an excellent plot against NM/sub r//sup 0.5/, where N is the number of atoms in the neutral, and M/sub r/ is the reduced mass. Neutrals containing double or triple bonds, or heavier-than-third-row atoms, show markedly enhanced quenching efficiency. The results are compared with other quenching efficiency studies of polyatomic ions and neutrals and show similarities to several other studies which have been interpreted in terms of a collision-duration or energy-flow limitation on the rate of energy removal. The present results are not in accord with models assuming energy equilibration in the collision complex on each collision.

• Research Organization: Case Western Reserve Univ., Cleveland, OH
• OSTI ID: 6508691
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 109:11; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ALKANES
ARGON
AROMATICS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
BROMINATED AROMATIC HYDROCARBONS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
COLLISIONS
DATA
DE-EXCITATION
DEUTERIUM
ELEMENTS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FLUIDS
GASES
HALOGENATED AROMATIC HYDROCARBONS
HELIUM 3
HELIUM 4
HELIUM ISOTOPES
HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
INFORMATION
ISOTOPE EFFECTS
ISOTOPES
KINETICS
LIGHT NUCLEI
METHANE
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
NEON
NITROGEN
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC BROMINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOCHEMISTRY
RADIATIONLESS DECAY
RARE GASES
REACTION KINETICS
STABLE ISOTOPES
WATER