Long-lived parent negative ions formed via nuclear-excited Feshbach resonances. Part 3. - Variation of the autodetachment lifetime with incident electron energy

L. G. Christophorou; A. Hadjiantonious; J. G. Carter

doi:10.1039/F29736901713

Long-lived parent negative ions formed via nuclear-excited Feshbach resonances. Part 3. - Variation of the autodetachment lifetime with incident electron energy

L. G. Christophorou
, A. Hadjiantonious
, J. G. Carter

Sensors and Electronics

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

The autodetachment lifetimes of the long-lived parent negative ions of o-nitrophenol (o-C₆H₄-OHNO₂), benzil (C₆H₅COCOC₆H₅), and tetracyanoethylene (C₂(CN)₄)-formed via nuclear-excited Feshbach resonances-decrease with increasing incident electron energy. The lifetimes for o-C₆H₄OHNO₂^-*, C₆H₅COCOC₆H₅^-*, and C₂(CN)₄^-* decrease from 420, 85, and 55 μs at ∼0.0 eV to 90, 10, and 11 μs at 0.6, 1.5, and 0.8 eV, respectively. These lifetime variations are theoretically treated and are attributed to the increase in the probability of autodetachment with increasing electron energy (which increases the compound negative ion's internal energy) due to the increase in the number of final neutral-molecule states to which the unstable compound negative ion can decay. From the theoretical analysis presented, the autodetachment lifetime is found to decrease with increasing incident electron energy much faster than is experimentally measured.

Original language	English
Pages (from-to)	1713-1722
Number of pages	10
Journal	Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
Volume	69
DOIs	https://doi.org/10.1039/F29736901713
State	Published - 1973

Funding

The observed variation with electron energy of the autodetachment lifetime for these long-lived parent negative ions is presented, discussed, and theoretically treated in this paper. EXPERIMENTAL The procedures followed in the determination of the parent negative ion yields, the energy scale calibration, and the measurement of the autodetachment lifetime and its variation with electron energy are in the main, as described in Parts 1 and Z3 t Research sponsored by the U.S. Atomic Energy Commission under contract with Union Carbide Corporation. $ Also Department of Physics, University of Tennessee, Knoxville, Tennessee 37916. 5 University of Tennessee, Knoxville, Tennessee ; on leave of absence from Democritos Nuclear Research Centre, Athens, Greece.

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@article{2b7b323bcd3047208048ccbc0c4765d4,

title = "Long-lived parent negative ions formed via nuclear-excited Feshbach resonances. Part 3. - Variation of the autodetachment lifetime with incident electron energy",

abstract = "The autodetachment lifetimes of the long-lived parent negative ions of o-nitrophenol (o-C6H4-OHNO2), benzil (C6H5COCOC6H5), and tetracyanoethylene (C2(CN)4)-formed via nuclear-excited Feshbach resonances-decrease with increasing incident electron energy. The lifetimes for o-C6H4OHNO2-*, C6H5COCOC6H5-*, and C2(CN)4-* decrease from 420, 85, and 55 μs at ∼0.0 eV to 90, 10, and 11 μs at 0.6, 1.5, and 0.8 eV, respectively. These lifetime variations are theoretically treated and are attributed to the increase in the probability of autodetachment with increasing electron energy (which increases the compound negative ion's internal energy) due to the increase in the number of final neutral-molecule states to which the unstable compound negative ion can decay. From the theoretical analysis presented, the autodetachment lifetime is found to decrease with increasing incident electron energy much faster than is experimentally measured.",

author = "Christophorou, \{L. G.\} and A. Hadjiantonious and Carter, \{J. G.\}",

year = "1973",

doi = "10.1039/F29736901713",

language = "English",

volume = "69",

pages = "1713--1722",

journal = "Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics",

issn = "0300-9238",

}

Long-lived parent negative ions formed via nuclear-excited Feshbach resonances. Part 3. - Variation of the autodetachment lifetime with incident electron energy. / Christophorou, L. G.; Hadjiantonious, A.; Carter, J. G.
In: Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics, Vol. 69, 1973, p. 1713-1722.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Long-lived parent negative ions formed via nuclear-excited Feshbach resonances. Part 3. - Variation of the autodetachment lifetime with incident electron energy

AU - Christophorou, L. G.

AU - Hadjiantonious, A.

AU - Carter, J. G.

PY - 1973

Y1 - 1973

N2 - The autodetachment lifetimes of the long-lived parent negative ions of o-nitrophenol (o-C6H4-OHNO2), benzil (C6H5COCOC6H5), and tetracyanoethylene (C2(CN)4)-formed via nuclear-excited Feshbach resonances-decrease with increasing incident electron energy. The lifetimes for o-C6H4OHNO2-*, C6H5COCOC6H5-*, and C2(CN)4-* decrease from 420, 85, and 55 μs at ∼0.0 eV to 90, 10, and 11 μs at 0.6, 1.5, and 0.8 eV, respectively. These lifetime variations are theoretically treated and are attributed to the increase in the probability of autodetachment with increasing electron energy (which increases the compound negative ion's internal energy) due to the increase in the number of final neutral-molecule states to which the unstable compound negative ion can decay. From the theoretical analysis presented, the autodetachment lifetime is found to decrease with increasing incident electron energy much faster than is experimentally measured.

AB - The autodetachment lifetimes of the long-lived parent negative ions of o-nitrophenol (o-C6H4-OHNO2), benzil (C6H5COCOC6H5), and tetracyanoethylene (C2(CN)4)-formed via nuclear-excited Feshbach resonances-decrease with increasing incident electron energy. The lifetimes for o-C6H4OHNO2-*, C6H5COCOC6H5-*, and C2(CN)4-* decrease from 420, 85, and 55 μs at ∼0.0 eV to 90, 10, and 11 μs at 0.6, 1.5, and 0.8 eV, respectively. These lifetime variations are theoretically treated and are attributed to the increase in the probability of autodetachment with increasing electron energy (which increases the compound negative ion's internal energy) due to the increase in the number of final neutral-molecule states to which the unstable compound negative ion can decay. From the theoretical analysis presented, the autodetachment lifetime is found to decrease with increasing incident electron energy much faster than is experimentally measured.

UR - https://www.scopus.com/pages/publications/37049129354

U2 - 10.1039/F29736901713

DO - 10.1039/F29736901713

M3 - Article

AN - SCOPUS:37049129354

SN - 0300-9238

VL - 69

SP - 1713

EP - 1722

JO - Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics

JF - Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics

ER -

Long-lived parent negative ions formed via nuclear-excited Feshbach resonances. Part 3. - Variation of the autodetachment lifetime with incident electron energy

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