Absolute cross section for the formation of C+ 60 ions produced by electron impact on C60

V. Tarnovsky, P. Kurunczi, S. Matt, T. D. Märk, H. Deutsch, K. Becker

Research output: Contribution to journalArticle

Abstract

We employed the fast-neutral-beam technique in a measurement of the absolute partial cross section for the formation of C+ 60 ions following controlled electron-impact ionization of the fullerene C60 from threshold to 200 eV. Our measurement is the first report of an absolute measurement of this cross section which does not employ any normalization procedure and which does not rely on the use of controversial vapour pressure versus temperature data for C60 to determine the C60 number density in the ion source. All quantities that determine the C+ 60 ionization cross section were measured directly in our apparatus. We found a peak value for the C+ 60 parent ionization cross section of 24.4 x 10-16 cm2 in the energy range between 70 and 80 eV. This value is in very good agreement (to within 5%) with the cross section reported earlier by Matt et al (1996 J. Chem. Phys. 105 1880) who employed a novel normalization procedure. Our cross section is significantly lower than the cross sections reported by several other investigators who relied on C60 vapour pressure data in their absolute calibration.

Original languageEnglish (US)
Pages (from-to)3043-3048
Number of pages6
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume31
Issue number13
DOIs
StatePublished - Jul 14 1998

Fingerprint

electron impact
cross sections
ionization cross sections
ions
vapor pressure
neutral beams
ion sources
fullerenes
ionization
thresholds
temperature
energy

ASJC Scopus subject areas

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

Cite this

Absolute cross section for the formation of C+ 60 ions produced by electron impact on C60. / Tarnovsky, V.; Kurunczi, P.; Matt, S.; Märk, T. D.; Deutsch, H.; Becker, K.

In: Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 31, No. 13, 14.07.1998, p. 3043-3048.

Research output: Contribution to journalArticle

Tarnovsky, V. ; Kurunczi, P. ; Matt, S. ; Märk, T. D. ; Deutsch, H. ; Becker, K. / Absolute cross section for the formation of C+ 60 ions produced by electron impact on C60. In: Journal of Physics B: Atomic, Molecular and Optical Physics. 1998 ; Vol. 31, No. 13. pp. 3043-3048.
@article{fa91c57212d14b29b3d08c84d4e73917,
title = "Absolute cross section for the formation of C+ 60 ions produced by electron impact on C60",
abstract = "We employed the fast-neutral-beam technique in a measurement of the absolute partial cross section for the formation of C+ 60 ions following controlled electron-impact ionization of the fullerene C60 from threshold to 200 eV. Our measurement is the first report of an absolute measurement of this cross section which does not employ any normalization procedure and which does not rely on the use of controversial vapour pressure versus temperature data for C60 to determine the C60 number density in the ion source. All quantities that determine the C+ 60 ionization cross section were measured directly in our apparatus. We found a peak value for the C+ 60 parent ionization cross section of 24.4 x 10-16 cm2 in the energy range between 70 and 80 eV. This value is in very good agreement (to within 5{\%}) with the cross section reported earlier by Matt et al (1996 J. Chem. Phys. 105 1880) who employed a novel normalization procedure. Our cross section is significantly lower than the cross sections reported by several other investigators who relied on C60 vapour pressure data in their absolute calibration.",
author = "V. Tarnovsky and P. Kurunczi and S. Matt and M{\"a}rk, {T. D.} and H. Deutsch and K. Becker",
year = "1998",
month = "7",
day = "14",
doi = "10.1088/0953-4075/31/13/020",
language = "English (US)",
volume = "31",
pages = "3043--3048",
journal = "Journal of Physics B: Atomic, Molecular and Optical Physics",
issn = "0953-4075",
publisher = "IOP Publishing Ltd.",
number = "13",

}

TY - JOUR

T1 - Absolute cross section for the formation of C+ 60 ions produced by electron impact on C60

AU - Tarnovsky, V.

AU - Kurunczi, P.

AU - Matt, S.

AU - Märk, T. D.

AU - Deutsch, H.

AU - Becker, K.

PY - 1998/7/14

Y1 - 1998/7/14

N2 - We employed the fast-neutral-beam technique in a measurement of the absolute partial cross section for the formation of C+ 60 ions following controlled electron-impact ionization of the fullerene C60 from threshold to 200 eV. Our measurement is the first report of an absolute measurement of this cross section which does not employ any normalization procedure and which does not rely on the use of controversial vapour pressure versus temperature data for C60 to determine the C60 number density in the ion source. All quantities that determine the C+ 60 ionization cross section were measured directly in our apparatus. We found a peak value for the C+ 60 parent ionization cross section of 24.4 x 10-16 cm2 in the energy range between 70 and 80 eV. This value is in very good agreement (to within 5%) with the cross section reported earlier by Matt et al (1996 J. Chem. Phys. 105 1880) who employed a novel normalization procedure. Our cross section is significantly lower than the cross sections reported by several other investigators who relied on C60 vapour pressure data in their absolute calibration.

AB - We employed the fast-neutral-beam technique in a measurement of the absolute partial cross section for the formation of C+ 60 ions following controlled electron-impact ionization of the fullerene C60 from threshold to 200 eV. Our measurement is the first report of an absolute measurement of this cross section which does not employ any normalization procedure and which does not rely on the use of controversial vapour pressure versus temperature data for C60 to determine the C60 number density in the ion source. All quantities that determine the C+ 60 ionization cross section were measured directly in our apparatus. We found a peak value for the C+ 60 parent ionization cross section of 24.4 x 10-16 cm2 in the energy range between 70 and 80 eV. This value is in very good agreement (to within 5%) with the cross section reported earlier by Matt et al (1996 J. Chem. Phys. 105 1880) who employed a novel normalization procedure. Our cross section is significantly lower than the cross sections reported by several other investigators who relied on C60 vapour pressure data in their absolute calibration.

UR - http://www.scopus.com/inward/record.url?scp=3843068619&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=3843068619&partnerID=8YFLogxK

U2 - 10.1088/0953-4075/31/13/020

DO - 10.1088/0953-4075/31/13/020

M3 - Article

VL - 31

SP - 3043

EP - 3048

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

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

SN - 0953-4075

IS - 13

ER -