Predicted carbon-cluster field evaporation from graphite by pulsed-field STM

X. H. Wu; E. L. Wolf

doi:10.1016/0039-6028(96)00587-0

Predicted carbon-cluster field evaporation from graphite by pulsed-field STM

X. H. Wu, E. L. Wolf

Applied Physics

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

Abstract

Field evaporation of carbon as positive and negative ions from the clean graphite (001) plane surface under STM pulsed-field conditions has been investigated. We use the charge-exchange model, taking the potential from a simple empirical atomic potential model. The removed carbon atom considered here initially resides in the perfect graphite surface, rather than being an adsorbed atom. Assuming a clean tungsten tip as counterelectrode, threshold electric fields for C^-, C⁺, and C²⁺ have been obtained. We further consider the possibility of field evaporation of C clusters. Our calculations indicate that C atoms can field-evaporate as members of ionic clusters at much lower threshold fields than a single carbon atom can. We conclude that ionic carbon clusters are favored in field evaporation from graphite, based on lower threshold fields obtained in the charge-exchange model.

Original language	English (US)
Pages (from-to)	353-359
Number of pages	7
Journal	Surface Science
Volume	366
Issue number	2
DOIs	https://doi.org/10.1016/0039-6028(96)00587-0
State	Published - Oct 20 1996

Keywords

Carbon clusters
Field evaporation
Graphite
Scanning tunneling microscopy

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

Access to Document

10.1016/0039-6028(96)00587-0

Cite this

@article{7d3b787b96c14b83b9bcd26616c0677e,

title = "Predicted carbon-cluster field evaporation from graphite by pulsed-field STM",

abstract = "Field evaporation of carbon as positive and negative ions from the clean graphite (001) plane surface under STM pulsed-field conditions has been investigated. We use the charge-exchange model, taking the potential from a simple empirical atomic potential model. The removed carbon atom considered here initially resides in the perfect graphite surface, rather than being an adsorbed atom. Assuming a clean tungsten tip as counterelectrode, threshold electric fields for C-, C+, and C2+ have been obtained. We further consider the possibility of field evaporation of C clusters. Our calculations indicate that C atoms can field-evaporate as members of ionic clusters at much lower threshold fields than a single carbon atom can. We conclude that ionic carbon clusters are favored in field evaporation from graphite, based on lower threshold fields obtained in the charge-exchange model.",

keywords = "Carbon clusters, Field evaporation, Graphite, Scanning tunneling microscopy",

author = "Wu, {X. H.} and Wolf, {E. L.}",

note = "Funding Information: This work has been supported in part by the US Department of Energy and by the Air Force Office of Scientific Research.",

year = "1996",

month = oct,

day = "20",

doi = "10.1016/0039-6028(96)00587-0",

language = "English (US)",

volume = "366",

pages = "353--359",

journal = "Surface Science",

issn = "0039-6028",

publisher = "Elsevier B.V.",

number = "2",

}

TY - JOUR

T1 - Predicted carbon-cluster field evaporation from graphite by pulsed-field STM

AU - Wu, X. H.

AU - Wolf, E. L.

N1 - Funding Information: This work has been supported in part by the US Department of Energy and by the Air Force Office of Scientific Research.

PY - 1996/10/20

Y1 - 1996/10/20

N2 - Field evaporation of carbon as positive and negative ions from the clean graphite (001) plane surface under STM pulsed-field conditions has been investigated. We use the charge-exchange model, taking the potential from a simple empirical atomic potential model. The removed carbon atom considered here initially resides in the perfect graphite surface, rather than being an adsorbed atom. Assuming a clean tungsten tip as counterelectrode, threshold electric fields for C-, C+, and C2+ have been obtained. We further consider the possibility of field evaporation of C clusters. Our calculations indicate that C atoms can field-evaporate as members of ionic clusters at much lower threshold fields than a single carbon atom can. We conclude that ionic carbon clusters are favored in field evaporation from graphite, based on lower threshold fields obtained in the charge-exchange model.

AB - Field evaporation of carbon as positive and negative ions from the clean graphite (001) plane surface under STM pulsed-field conditions has been investigated. We use the charge-exchange model, taking the potential from a simple empirical atomic potential model. The removed carbon atom considered here initially resides in the perfect graphite surface, rather than being an adsorbed atom. Assuming a clean tungsten tip as counterelectrode, threshold electric fields for C-, C+, and C2+ have been obtained. We further consider the possibility of field evaporation of C clusters. Our calculations indicate that C atoms can field-evaporate as members of ionic clusters at much lower threshold fields than a single carbon atom can. We conclude that ionic carbon clusters are favored in field evaporation from graphite, based on lower threshold fields obtained in the charge-exchange model.

KW - Carbon clusters

KW - Field evaporation

KW - Graphite

KW - Scanning tunneling microscopy

UR - http://www.scopus.com/inward/record.url?scp=0030257433&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0030257433&partnerID=8YFLogxK

U2 - 10.1016/0039-6028(96)00587-0

DO - 10.1016/0039-6028(96)00587-0

M3 - Article

AN - SCOPUS:0030257433

SN - 0039-6028

VL - 366

SP - 353

EP - 359

JO - Surface Science

JF - Surface Science

IS - 2

ER -

Predicted carbon-cluster field evaporation from graphite by pulsed-field STM

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this