Angle-differential observation of plasmon electrons in the double-differential cross-section spectra of fast-ion-induced electron ejection from C60

A. H. Kelkar, L. Gulyás, Lokesh C. Tribedi

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We report on the measurement of double-differential distribution of soft electron emission from C60 fullerene, induced by a fast-moving Coulomb field of 76 MeV energy bare fluorine ions. A broad "plasmon-electron" peak, riding on the Coulomb-ionization continuum, is observed due to the deexcitation of the giant dipole plasmon resonance state in C60. The angular distribution of the plasmon electrons goes through a dip around 90, which is contrary to that observed in ion-atom collisions measured in situ, indicating the alignment of the induced dipole moment along the projectile beam direction. A model based on the photoelectron angular distribution which is modified due to the ion-induced postcollisional interaction provides an excellent agreement with the observed asymmetric distribution. The distribution smoothly changes from a dip at 90 to a peak with the variation of ejected electron energy indicating transition from a collective plasmon behavior of the whole system to a single ion-atom interaction. The single-differential cross section was also derived, which preserves the signature of the collective excitation.

Original languageEnglish
Article number052708
JournalPhysical Review A
Volume92
Issue number5
DOIs
Publication statusPublished - Nov 18 2015

Fingerprint

ejection
cross sections
ion atom interactions
angular distribution
ions
electrons
electron emission
fullerenes
fluorine
projectiles
dipole moments
photoelectrons
alignment
signatures
electron energy
dipoles
continuums
ionization
collisions
excitation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Angle-differential observation of plasmon electrons in the double-differential cross-section spectra of fast-ion-induced electron ejection from C60. / Kelkar, A. H.; Gulyás, L.; Tribedi, Lokesh C.

In: Physical Review A, Vol. 92, No. 5, 052708, 18.11.2015.

Research output: Contribution to journalArticle

@article{fcf2d96d77a344f3abc4a6236c2bfdcc,
title = "Angle-differential observation of plasmon electrons in the double-differential cross-section spectra of fast-ion-induced electron ejection from C60",
abstract = "We report on the measurement of double-differential distribution of soft electron emission from C60 fullerene, induced by a fast-moving Coulomb field of 76 MeV energy bare fluorine ions. A broad {"}plasmon-electron{"} peak, riding on the Coulomb-ionization continuum, is observed due to the deexcitation of the giant dipole plasmon resonance state in C60. The angular distribution of the plasmon electrons goes through a dip around 90, which is contrary to that observed in ion-atom collisions measured in situ, indicating the alignment of the induced dipole moment along the projectile beam direction. A model based on the photoelectron angular distribution which is modified due to the ion-induced postcollisional interaction provides an excellent agreement with the observed asymmetric distribution. The distribution smoothly changes from a dip at 90 to a peak with the variation of ejected electron energy indicating transition from a collective plasmon behavior of the whole system to a single ion-atom interaction. The single-differential cross section was also derived, which preserves the signature of the collective excitation.",
author = "Kelkar, {A. H.} and L. Guly{\'a}s and Tribedi, {Lokesh C.}",
year = "2015",
month = "11",
day = "18",
doi = "10.1103/PhysRevA.92.052708",
language = "English",
volume = "92",
journal = "Physical Review A",
issn = "2469-9926",
publisher = "American Physical Society",
number = "5",

}

TY - JOUR

T1 - Angle-differential observation of plasmon electrons in the double-differential cross-section spectra of fast-ion-induced electron ejection from C60

AU - Kelkar, A. H.

AU - Gulyás, L.

AU - Tribedi, Lokesh C.

PY - 2015/11/18

Y1 - 2015/11/18

N2 - We report on the measurement of double-differential distribution of soft electron emission from C60 fullerene, induced by a fast-moving Coulomb field of 76 MeV energy bare fluorine ions. A broad "plasmon-electron" peak, riding on the Coulomb-ionization continuum, is observed due to the deexcitation of the giant dipole plasmon resonance state in C60. The angular distribution of the plasmon electrons goes through a dip around 90, which is contrary to that observed in ion-atom collisions measured in situ, indicating the alignment of the induced dipole moment along the projectile beam direction. A model based on the photoelectron angular distribution which is modified due to the ion-induced postcollisional interaction provides an excellent agreement with the observed asymmetric distribution. The distribution smoothly changes from a dip at 90 to a peak with the variation of ejected electron energy indicating transition from a collective plasmon behavior of the whole system to a single ion-atom interaction. The single-differential cross section was also derived, which preserves the signature of the collective excitation.

AB - We report on the measurement of double-differential distribution of soft electron emission from C60 fullerene, induced by a fast-moving Coulomb field of 76 MeV energy bare fluorine ions. A broad "plasmon-electron" peak, riding on the Coulomb-ionization continuum, is observed due to the deexcitation of the giant dipole plasmon resonance state in C60. The angular distribution of the plasmon electrons goes through a dip around 90, which is contrary to that observed in ion-atom collisions measured in situ, indicating the alignment of the induced dipole moment along the projectile beam direction. A model based on the photoelectron angular distribution which is modified due to the ion-induced postcollisional interaction provides an excellent agreement with the observed asymmetric distribution. The distribution smoothly changes from a dip at 90 to a peak with the variation of ejected electron energy indicating transition from a collective plasmon behavior of the whole system to a single ion-atom interaction. The single-differential cross section was also derived, which preserves the signature of the collective excitation.

UR - http://www.scopus.com/inward/record.url?scp=84948423585&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84948423585&partnerID=8YFLogxK

U2 - 10.1103/PhysRevA.92.052708

DO - 10.1103/PhysRevA.92.052708

M3 - Article

AN - SCOPUS:84948423585

VL - 92

JO - Physical Review A

JF - Physical Review A

SN - 2469-9926

IS - 5

M1 - 052708

ER -