DOI: 10.1063/1.440080. Energetics of fragmentation of CH5, H3O, and NH4 from neutralized ion-beam experiments

Energetics of fragmentation of CH5, H3O, and NH4 from neutralized ion-beam experiments

10.1063/1.440080

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

Fragmentation energies for radicals of the type RH2 (RH=CH4, NH3, and H2O) produced by electron capture interactions of 5 keV RH2+ ion with Na or K atoms are reported. The experimental technique involves measurement of spatial beam profiles resulting from dissociation of neutral radicals following their formation in a near resonant electron transfer process. Cross sections for RH2+–Na capture reactions are typically 1x10−14 cm2. Fragmentation energies from measurements with Na target atoms are −2.65±0.14, −0.22±0.03, and −1.12±0.07 eV for CH5, NH4, and H3O, respectively. From our results with Na and K targets and published values for proton affinities, the vertical electron affinities of CH5+ and H3O+ are calculated to be 5.3±0.2 eV and 5.1±0.3 eV, respectively. Beam profiles for ND4 show this species to be metastable with a lifetime of about 1 μs. From this we estimate a potential barrier to dissociation in NH4(ND4) between 0.36 and 0.48 eV, indicating this species should be stable at low temperatures. Comparison of these experimental results with theoretical calculations indicates areas of disagreement.

Bibliography

Williams, B. W., & Porter, R. F. (1980). Energetics of fragmentation of CH5, H3O, and NH4 from neutralized ion-beam experiments. The Journal of Chemical Physics, 73(11), 5598â5604.

Authors 2

Brian Wesley Williams (first)
Richard F. Porter (additional)

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Dates

Type	When
Created	22 years, 6 months ago (Feb. 28, 2003, 10:31 a.m.)
Deposited	1 year, 6 months ago (Feb. 9, 2024, 5:04 p.m.)
Indexed	1 year, 1 month ago (Aug. 2, 2024, 9:55 a.m.)
Issued	44 years, 9 months ago (Dec. 1, 1980)
Published	44 years, 9 months ago (Dec. 1, 1980)
Published Print	44 years, 9 months ago (Dec. 1, 1980)

Funders 0

None

BibTeX

@article{Williams_1980, title={Energetics of fragmentation of CH5, H3O, and NH4 from neutralized ion-beam experiments}, volume={73}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.440080}, DOI={10.1063/1.440080}, number={11}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Williams, Brian Wesley and Porter, Richard F.}, year={1980}, month=dec, pages={5598–5604} }

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  "abstract": "<jats:p>Fragmentation energies for radicals of the type RH2 (RH=CH4, NH3, and H2O) produced by electron capture interactions of 5 keV RH2+ ion with Na or K atoms are reported. The experimental technique involves measurement of spatial beam profiles resulting from dissociation of neutral radicals following their formation in a near resonant electron transfer process. Cross sections for RH2+\u2013Na capture reactions are typically 1x10\u221214 cm2. Fragmentation energies from measurements with Na target atoms are \u22122.65\u00b10.14, \u22120.22\u00b10.03, and \u22121.12\u00b10.07 eV for CH5, NH4, and H3O, respectively. From our results with Na and K targets and published values for proton affinities, the vertical electron affinities of CH5+ and H3O+ are calculated to be 5.3\u00b10.2 eV and 5.1\u00b10.3 eV, respectively. Beam profiles for ND4 show this species to be metastable with a lifetime of about 1 \u03bcs. From this we estimate a potential barrier to dissociation in NH4(ND4) between 0.36 and 0.48 eV, indicating this species should be stable at low temperatures. Comparison of these experimental results with theoretical calculations indicates areas of disagreement.</jats:p>",
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