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Threshold Behavior for Collision-Induced Dissociation

E. K. Parks, S.H. Sheen, G. Dimoplon, S. Wexler

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Abstract

A fundamental collisional process at elevated energies is the dissociation of a molecule into two or more fragments via a collision with a third body. This so called collision-induced dissociation (CID) has been observed extensively in ion-molecule reactions ( 1 ) and, in more recent years, between neutral species ( 2-4 ). CID of the alkali and thallium halides to ion pairs has been studied in this laboratory for the last few years, and the threshold behavior for the process has been determined ( 4, 5 ). Typical reactions observed are M + CsCl → M + Cs + + Cl - → CsM + + Cl - for the monomer and M + Cs 2 Cl 2 → M + Cs 2 Cl + + Cl - → M + Cs + + CsCl - 2 for the dimer. The experiments involve accelerating the M species by the seeded jet method, with H2 as the propellant, and crossing the beam of M with a beam of the cesium or

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A fundamental collisional process at elevated energies is the dissociation of a molecule into two or more fragments via a collision with a third body. This so called collision-induced dissociation (CID) has been observed extensively in ion-molecule reactions ( 1 ) and, in more recent years, between neutral species ( 2-4 ). CID of the alkali and thallium halides to ion pairs has been studied in this laboratory for the last few years, and the threshold behavior for the process has been determined ( 4, 5 ). Typical reactions observed are M + CsCl → M + Cs + + Cl - → CsM + + Cl - for the monomer and M + Cs 2 Cl 2 → M + Cs 2 Cl + + Cl - → M + Cs + + CsCl - 2 for the dimer. The experiments involve accelerating the M species by the seeded jet method, with H2 as the propellant, and crossing the beam of M with a beam of the cesium or

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Available abstract

A fundamental collisional process at elevated energies is the dissociation of a molecule into two or more fragments via a collision with a third body. This so called collision-induced dissociation (CID) has been observed extensively in ion-molecule reactions ( 1 ) and, in more recent years, between neutral species ( 2-4 ). CID of the alkali and thallium halides to ion pairs has been studied in this laboratory for the last few years, and the threshold behavior for the process has been determined ( 4, 5 ). Typical reactions observed are M + CsCl → M + Cs + + Cl - → CsM + + Cl - for the monomer and M + Cs 2 Cl 2 → M + Cs 2 Cl + + Cl - → M + Cs + + CsCl - 2 for the dimer. The experiments involve accelerating the M species by the seeded jet method, with H2 as the propellant, and crossing the beam of M with a beam of the cesium or

Key concepts: Dissociation (chemistry), Collision-induced dissociation, Dimer, Chemistry, Ion, Atomic physics, Halide, Caesium

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