The Reaction Rate Coefficient for the Clustering of He to Li + at Low Centre of Mass Energies

Cassidy, RA; Elford, M. T.

doi:10.1071/ph850577

Cited by 3 publications

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“…At liquid helium temperature, however, the threebody reaction 0 : + He + He + 02He" + He (4) can occur, as can further associative reactions leading to cluster formation. Such a process has been observed by Cassidy andElford (1984, 1985) for Lit in Ar at room temperature; the effect leads to a pressure dependence of mobility measurement, which is too small to…”

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confidence: 85%

“…There remains the possibility that temporary ion-atom complexes are formed in the drift tube, as suggested by Elford and Milloy (1974). This phenomenon has been used by Cassidy and Elford (1984) to explain the slight pressure dependence of their mobility measurements for Kt in Ar, but has not been suggested to cause mobility to drop below the polarization limit. Below 10 K mobility declines sharply.…”

Section: L436mentioning

confidence: 99%

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Ion mobility measurements for O₂⁺in helium gas at 4.35 K

Sanderson¹,

Tanuma²,

Kobayashi³

et al. 1994

J. Phys. B: At. Mol. Opt. Phys.

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The mobility of O2+ in He has been measured using a liquid helium cooled, selected ion drift tube at 4.35 K. The dependence of mobility on effective temperature, for O2+, is similar to that measured previously for rare gas ions moving in He. The mobility reaches a maximum at between 500 K and 600 K where it is in reasonable agreement with the existing room temperature measurements. Below 70 K there is a region in which mobility is constant, but lower than the polarization limit, and below 10 K, mobility decreases sharply. Although clustering reactions occur at low effective temperature, it is not certain that they are responsible for these phenomena, and although a quantum mechanical orbiting resonance is expected to occur at low collision energies, there are no theoretical predictions of its importance for the O2+-He system.

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mentioning

confidence: 85%

Section: L436mentioning

confidence: 99%

Ion mobility measurements for O₂⁺in helium gas at 4.35 K

Sanderson¹,

Tanuma²,

Kobayashi³

et al. 1994

J. Phys. B: At. Mol. Opt. Phys.

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Ion mobility measurements for O+ and N+ in helium gas at 4.35 K

Sanderson

Tanuma

Kobayashi

et al. 1995

The Journal of Chemical Physics

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The mobilities of O+ and N+ in He have been measured using a liquid helium cooled, selected ion drift tube, at 4.35 K. Results are compared with previous experimental work at higher temperatures and, in the case of O+, comparison is made with theoretical work, where a good agreement is found. The dependence of mobility on effective temperature is discussed in light of our previous work and our measurements are related to features of the ion–atom potential. In order to facilitate further theoretical analysis, recommended values of mobility are tabulated for O+ and N+ in He and also for O+2, N+2, and CO+ in He.

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The mobility of N₂⁺and CO⁺in helium gas at 4.35 K

Sanderson

Tanuma

Kobayashi

et al. 1993

J. Phys. B: At. Mol. Opt. Phys.

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The ion mobilities of N2+ and CO+ in He have been measured using a liquid-helium-cooled, selected ion drift tube at 4.35 K. Mobility reaches a maximum at an effective temperature of between 400 K and 600 K, where it is in reasonable agreement with the room temperature measurements of other experimenters. Below 100 K there is a region in which the mobilities are constant, N2+ close to the polarization limit and CO+ somewhat lower, possibly due to the occurrence of collisionally induced, rotational excitation. At very low effective temperature though, below 10 K, the mobilities decrease sharply, below the polarization limit. This may be further evidence for the existence of orbiting resonance such as that suggested previously by Kojima et al. for He+ in He.

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The Reaction Rate Coefficient for the Clustering of He to Li + at Low Centre of Mass Energies

Cited by 3 publications

References 2 publications

Ion mobility measurements for O₂⁺in helium gas at 4.35 K

Ion mobility measurements for O₂⁺in helium gas at 4.35 K

Ion mobility measurements for O+ and N+ in helium gas at 4.35 K

The mobility of N₂⁺and CO⁺in helium gas at 4.35 K

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The Reaction Rate Coefficient for the Clustering of He to Li + at Low Centre of Mass Energies

Cited by 3 publications

References 2 publications

Ion mobility measurements for O2+in helium gas at 4.35 K

Ion mobility measurements for O2+in helium gas at 4.35 K

Ion mobility measurements for O+ and N+ in helium gas at 4.35 K

The mobility of N2+and CO+in helium gas at 4.35 K

Contact Info

Product

Resources

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Ion mobility measurements for O₂⁺in helium gas at 4.35 K

Ion mobility measurements for O₂⁺in helium gas at 4.35 K

The mobility of N₂⁺and CO⁺in helium gas at 4.35 K