DOI: 10.1063/1.431875. Collisional ionization of Na, K, and Cs by CO2, COS, and CS2: Molecular electron affinities

Collisional ionization of Na, K, and Cs by CO2, COS, and CS2: Molecular electron affinities

10.1063/1.431875

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

The negative ion products resulting from collisions between orthogonal beams of alkali metal atoms (Na, K, Cs) and the linear triatomic molecules CO2, COS, and CS2 have been studied from threshold to ∼400 eV (lab). Ions with masses corresponding to the parent molecules CO2, COS, and CS2 are detected for all collision permutations except for Na colliding with CO2. The following electron affinities are deduced from measurements of the threshold for the ion pair production reactions: CO2(−0.60±0.2 eV), COS(+0.46±0.2 eV), and CS2(1.0±0.2 eV). The CO−2 ion was found to be metastable with respect to autodetachment. This result is compatible with the negative electron affinity for CO2 and in agreement with our earlier observations of CO−2* and with recent theoretical calculations. The lifetime of CO−2* (9±2×10−5 sec) was measured to be independent of collision energy over the region of energy studied (threshold to ∼20 eV c.m.). The fragment ions O−/CO2, O−/COS, S−/COS, and S−/CS2 were detected at a threshold energy which is consistent with the known energetics of the reactions. These results are compared with recent dissociative electron attachment studies.

Bibliography

Compton, R. N., Reinhardt, P. W., & Cooper, C. D. (1975). Collisional ionization of Na, K, and Cs by CO2, COS, and CS2: Molecular electron affinities. The Journal of Chemical Physics, 63(9), 3821â3827.

Authors 3

R. N. Compton (first)
P. W. Reinhardt (additional)
C. D. Cooper (additional)

References 32 Referenced 296

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Dates

Type	When
Created	22 years, 6 months ago (Feb. 27, 2003, 3:57 p.m.)
Deposited	1 year, 6 months ago (Feb. 9, 2024, 9:22 a.m.)
Indexed	2 weeks, 2 days ago (Aug. 21, 2025, 12:59 p.m.)
Issued	49 years, 10 months ago (Nov. 1, 1975)
Published	49 years, 10 months ago (Nov. 1, 1975)
Published Print	49 years, 10 months ago (Nov. 1, 1975)

Funders 0

None

BibTeX

@article{Compton_1975, title={Collisional ionization of Na, K, and Cs by CO2, COS, and CS2: Molecular electron affinities}, volume={63}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.431875}, DOI={10.1063/1.431875}, number={9}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Compton, R. N. and Reinhardt, P. W. and Cooper, C. D.}, year={1975}, month=nov, pages={3821–3827} }

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