Molecular dynamics simulations of sputtering of Langmuir - Blodgett multilayers by kiloelectronvolt C 60 projectiles

R. Paruch, L. Rzeznik, B. Czerwinski, Barbara Jane Garrison, Nicholas Winograd, Z. Postawa

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Coarse-grained molecular dynamics computer simulations are applied to investigate fundamental processes induced by an impact of keV C 60 projectile at an organic overlayer composed of long, well-organized linear molecules. The energy transfer pathways, sputtering yields, and the damage induced in the irradiated system, represented by Langmuir - Blodgett (LB) multilayers composed of molecules of bariated arachidic acid, are investigated as a function of the kinetic energy and impact angle of the projectile and the thickness of the organic system. In particular, the unique challenges of depth profiling through a LB film versus a more isotropic solid are discussed. The results indicate that the trajectories of projectile fragments and, consequently, the primary energy can be channeled by the geometrical structure of the overlayer. Although, a similar process is known from sputtering of single crystals by atomic projectiles, it has not been anticipated to occur during C 60 bombardment due to the large size of the projectile. An open and ordered molecular structure of LB films is responsible for such behavior. Both the extent of damage and the efficiency of sputtering depend on the kinetic energy, the impact angle, and the layer thickness. The results indicate that the best depth profiling conditions can be achieved with low-energy cluster projectiles irradiating the organic overlayer at large off-normal angles.

Original languageEnglish (US)
Pages (from-to)5641-5648
Number of pages8
JournalJournal of Physical Chemistry C
Volume113
Issue number14
DOIs
StatePublished - Apr 9 2009

Fingerprint

Projectiles
Sputtering
Molecular dynamics
projectiles
Multilayers
sputtering
molecular dynamics
Computer simulation
Depth profiling
simulation
Langmuir Blodgett films
Langmuir-Blodgett films
Kinetic energy
kinetic energy
damage
Molecules
Energy transfer
Molecular structure
bombardment
molecules

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Paruch, R. ; Rzeznik, L. ; Czerwinski, B. ; Garrison, Barbara Jane ; Winograd, Nicholas ; Postawa, Z. / Molecular dynamics simulations of sputtering of Langmuir - Blodgett multilayers by kiloelectronvolt C 60 projectiles. In: Journal of Physical Chemistry C. 2009 ; Vol. 113, No. 14. pp. 5641-5648.
@article{da3695b834de4fec8b1071c8649e8744,
title = "Molecular dynamics simulations of sputtering of Langmuir - Blodgett multilayers by kiloelectronvolt C 60 projectiles",
abstract = "Coarse-grained molecular dynamics computer simulations are applied to investigate fundamental processes induced by an impact of keV C 60 projectile at an organic overlayer composed of long, well-organized linear molecules. The energy transfer pathways, sputtering yields, and the damage induced in the irradiated system, represented by Langmuir - Blodgett (LB) multilayers composed of molecules of bariated arachidic acid, are investigated as a function of the kinetic energy and impact angle of the projectile and the thickness of the organic system. In particular, the unique challenges of depth profiling through a LB film versus a more isotropic solid are discussed. The results indicate that the trajectories of projectile fragments and, consequently, the primary energy can be channeled by the geometrical structure of the overlayer. Although, a similar process is known from sputtering of single crystals by atomic projectiles, it has not been anticipated to occur during C 60 bombardment due to the large size of the projectile. An open and ordered molecular structure of LB films is responsible for such behavior. Both the extent of damage and the efficiency of sputtering depend on the kinetic energy, the impact angle, and the layer thickness. The results indicate that the best depth profiling conditions can be achieved with low-energy cluster projectiles irradiating the organic overlayer at large off-normal angles.",
author = "R. Paruch and L. Rzeznik and B. Czerwinski and Garrison, {Barbara Jane} and Nicholas Winograd and Z. Postawa",
year = "2009",
month = "4",
day = "9",
doi = "10.1021/jp809769q",
language = "English (US)",
volume = "113",
pages = "5641--5648",
journal = "Journal of Physical Chemistry C",
issn = "1932-7447",
publisher = "American Chemical Society",
number = "14",

}

Molecular dynamics simulations of sputtering of Langmuir - Blodgett multilayers by kiloelectronvolt C 60 projectiles. / Paruch, R.; Rzeznik, L.; Czerwinski, B.; Garrison, Barbara Jane; Winograd, Nicholas; Postawa, Z.

In: Journal of Physical Chemistry C, Vol. 113, No. 14, 09.04.2009, p. 5641-5648.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Molecular dynamics simulations of sputtering of Langmuir - Blodgett multilayers by kiloelectronvolt C 60 projectiles

AU - Paruch, R.

AU - Rzeznik, L.

AU - Czerwinski, B.

AU - Garrison, Barbara Jane

AU - Winograd, Nicholas

AU - Postawa, Z.

PY - 2009/4/9

Y1 - 2009/4/9

N2 - Coarse-grained molecular dynamics computer simulations are applied to investigate fundamental processes induced by an impact of keV C 60 projectile at an organic overlayer composed of long, well-organized linear molecules. The energy transfer pathways, sputtering yields, and the damage induced in the irradiated system, represented by Langmuir - Blodgett (LB) multilayers composed of molecules of bariated arachidic acid, are investigated as a function of the kinetic energy and impact angle of the projectile and the thickness of the organic system. In particular, the unique challenges of depth profiling through a LB film versus a more isotropic solid are discussed. The results indicate that the trajectories of projectile fragments and, consequently, the primary energy can be channeled by the geometrical structure of the overlayer. Although, a similar process is known from sputtering of single crystals by atomic projectiles, it has not been anticipated to occur during C 60 bombardment due to the large size of the projectile. An open and ordered molecular structure of LB films is responsible for such behavior. Both the extent of damage and the efficiency of sputtering depend on the kinetic energy, the impact angle, and the layer thickness. The results indicate that the best depth profiling conditions can be achieved with low-energy cluster projectiles irradiating the organic overlayer at large off-normal angles.

AB - Coarse-grained molecular dynamics computer simulations are applied to investigate fundamental processes induced by an impact of keV C 60 projectile at an organic overlayer composed of long, well-organized linear molecules. The energy transfer pathways, sputtering yields, and the damage induced in the irradiated system, represented by Langmuir - Blodgett (LB) multilayers composed of molecules of bariated arachidic acid, are investigated as a function of the kinetic energy and impact angle of the projectile and the thickness of the organic system. In particular, the unique challenges of depth profiling through a LB film versus a more isotropic solid are discussed. The results indicate that the trajectories of projectile fragments and, consequently, the primary energy can be channeled by the geometrical structure of the overlayer. Although, a similar process is known from sputtering of single crystals by atomic projectiles, it has not been anticipated to occur during C 60 bombardment due to the large size of the projectile. An open and ordered molecular structure of LB films is responsible for such behavior. Both the extent of damage and the efficiency of sputtering depend on the kinetic energy, the impact angle, and the layer thickness. The results indicate that the best depth profiling conditions can be achieved with low-energy cluster projectiles irradiating the organic overlayer at large off-normal angles.

UR - http://www.scopus.com/inward/record.url?scp=65249167585&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=65249167585&partnerID=8YFLogxK

U2 - 10.1021/jp809769q

DO - 10.1021/jp809769q

M3 - Article

AN - SCOPUS:65249167585

VL - 113

SP - 5641

EP - 5648

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

SN - 1932-7447

IS - 14

ER -