Partial cross sections for positive and negative ion formation following electron impact on uracil

S. Feil, K. Gluch, S. Matt-Leubner, P. Scheier, J. Limtrakul, M. Probst, H. Deutsch, K. Becker, A. Stamatovic, T. D. Märk

Research output: Contribution to journalArticle

Abstract

We report absolute partial cross sections for the formation of selected positive and negative ions resulting from electron interactions with uracil. Absolute calibration of the measured partial cross sections for the formation of the three most intense positive ions, the parent C4H 4N2O2 + ion and the C 3H3NO+ and OCN+ fragment ions, was achieved by normalization of the total single uracil ionization cross section (obtained as the sum of all measured partial single ionization cross sections) to a calculated cross section based on the semi-classical Deutsch-Märk formalism at 100 eV. Subsequently, we used the OCN+ cross section in conjunction with the known sensitivity ratio for positive and negative ion detection in our apparatus (obtained from the well-known cross sections for SF4 + and SF4 - formation from SF 6) to determine the dissociative attachment cross section for OCN- formation from uracil. This cross section was found to be roughly an order of magnitude smaller, about 5 × 10-22 m 2 at 6.5 eV, compared to our previously reported preliminary value. We attribute this discrepancy to the difficult determination of the uracil target density in the earlier work. Using a reliably calculated cross section for normalization purposes avoids this complication.

Original languageEnglish (US)
Pages (from-to)3013-3020
Number of pages8
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume37
Issue number15
DOIs
StatePublished - Aug 14 2004

Fingerprint

uracil
positive ions
negative ions
electron impact
cross sections
ionization cross sections
attachment
ions
electron scattering
fragments
formalism
sensitivity

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physics and Astronomy(all)

Cite this

Partial cross sections for positive and negative ion formation following electron impact on uracil. / Feil, S.; Gluch, K.; Matt-Leubner, S.; Scheier, P.; Limtrakul, J.; Probst, M.; Deutsch, H.; Becker, K.; Stamatovic, A.; Märk, T. D.

In: Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 37, No. 15, 14.08.2004, p. 3013-3020.

Research output: Contribution to journalArticle

Feil, S, Gluch, K, Matt-Leubner, S, Scheier, P, Limtrakul, J, Probst, M, Deutsch, H, Becker, K, Stamatovic, A & Märk, TD 2004, 'Partial cross sections for positive and negative ion formation following electron impact on uracil', Journal of Physics B: Atomic, Molecular and Optical Physics, vol. 37, no. 15, pp. 3013-3020. https://doi.org/10.1088/0953-4075/37/15/001
Feil, S. ; Gluch, K. ; Matt-Leubner, S. ; Scheier, P. ; Limtrakul, J. ; Probst, M. ; Deutsch, H. ; Becker, K. ; Stamatovic, A. ; Märk, T. D. / Partial cross sections for positive and negative ion formation following electron impact on uracil. In: Journal of Physics B: Atomic, Molecular and Optical Physics. 2004 ; Vol. 37, No. 15. pp. 3013-3020.
@article{526793a197e54a71bc71c8eb5ef98d16,
title = "Partial cross sections for positive and negative ion formation following electron impact on uracil",
abstract = "We report absolute partial cross sections for the formation of selected positive and negative ions resulting from electron interactions with uracil. Absolute calibration of the measured partial cross sections for the formation of the three most intense positive ions, the parent C4H 4N2O2 + ion and the C 3H3NO+ and OCN+ fragment ions, was achieved by normalization of the total single uracil ionization cross section (obtained as the sum of all measured partial single ionization cross sections) to a calculated cross section based on the semi-classical Deutsch-M{\"a}rk formalism at 100 eV. Subsequently, we used the OCN+ cross section in conjunction with the known sensitivity ratio for positive and negative ion detection in our apparatus (obtained from the well-known cross sections for SF4 + and SF4 - formation from SF 6) to determine the dissociative attachment cross section for OCN- formation from uracil. This cross section was found to be roughly an order of magnitude smaller, about 5 × 10-22 m 2 at 6.5 eV, compared to our previously reported preliminary value. We attribute this discrepancy to the difficult determination of the uracil target density in the earlier work. Using a reliably calculated cross section for normalization purposes avoids this complication.",
author = "S. Feil and K. Gluch and S. Matt-Leubner and P. Scheier and J. Limtrakul and M. Probst and H. Deutsch and K. Becker and A. Stamatovic and M{\"a}rk, {T. D.}",
year = "2004",
month = "8",
day = "14",
doi = "10.1088/0953-4075/37/15/001",
language = "English (US)",
volume = "37",
pages = "3013--3020",
journal = "Journal of Physics B: Atomic, Molecular and Optical Physics",
issn = "0953-4075",
publisher = "IOP Publishing Ltd.",
number = "15",

}

TY - JOUR

T1 - Partial cross sections for positive and negative ion formation following electron impact on uracil

AU - Feil, S.

AU - Gluch, K.

AU - Matt-Leubner, S.

AU - Scheier, P.

AU - Limtrakul, J.

AU - Probst, M.

AU - Deutsch, H.

AU - Becker, K.

AU - Stamatovic, A.

AU - Märk, T. D.

PY - 2004/8/14

Y1 - 2004/8/14

N2 - We report absolute partial cross sections for the formation of selected positive and negative ions resulting from electron interactions with uracil. Absolute calibration of the measured partial cross sections for the formation of the three most intense positive ions, the parent C4H 4N2O2 + ion and the C 3H3NO+ and OCN+ fragment ions, was achieved by normalization of the total single uracil ionization cross section (obtained as the sum of all measured partial single ionization cross sections) to a calculated cross section based on the semi-classical Deutsch-Märk formalism at 100 eV. Subsequently, we used the OCN+ cross section in conjunction with the known sensitivity ratio for positive and negative ion detection in our apparatus (obtained from the well-known cross sections for SF4 + and SF4 - formation from SF 6) to determine the dissociative attachment cross section for OCN- formation from uracil. This cross section was found to be roughly an order of magnitude smaller, about 5 × 10-22 m 2 at 6.5 eV, compared to our previously reported preliminary value. We attribute this discrepancy to the difficult determination of the uracil target density in the earlier work. Using a reliably calculated cross section for normalization purposes avoids this complication.

AB - We report absolute partial cross sections for the formation of selected positive and negative ions resulting from electron interactions with uracil. Absolute calibration of the measured partial cross sections for the formation of the three most intense positive ions, the parent C4H 4N2O2 + ion and the C 3H3NO+ and OCN+ fragment ions, was achieved by normalization of the total single uracil ionization cross section (obtained as the sum of all measured partial single ionization cross sections) to a calculated cross section based on the semi-classical Deutsch-Märk formalism at 100 eV. Subsequently, we used the OCN+ cross section in conjunction with the known sensitivity ratio for positive and negative ion detection in our apparatus (obtained from the well-known cross sections for SF4 + and SF4 - formation from SF 6) to determine the dissociative attachment cross section for OCN- formation from uracil. This cross section was found to be roughly an order of magnitude smaller, about 5 × 10-22 m 2 at 6.5 eV, compared to our previously reported preliminary value. We attribute this discrepancy to the difficult determination of the uracil target density in the earlier work. Using a reliably calculated cross section for normalization purposes avoids this complication.

UR - http://www.scopus.com/inward/record.url?scp=4043072784&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4043072784&partnerID=8YFLogxK

U2 - 10.1088/0953-4075/37/15/001

DO - 10.1088/0953-4075/37/15/001

M3 - Article

AN - SCOPUS:4043072784

VL - 37

SP - 3013

EP - 3020

JO - Journal of Physics B: Atomic, Molecular and Optical Physics

JF - Journal of Physics B: Atomic, Molecular and Optical Physics

SN - 0953-4075

IS - 15

ER -