The collision of a hypervelocity massive projectile with free-standing graphene: Investigation of secondary ion emission and projectile fragmentation.
J Chem Phys
; 146(5): 054305, 2017 Feb 07.
Article
em En
| MEDLINE
| ID: mdl-28178829
ABSTRACT
We present here the study of the individual hypervelocity massive projectiles (440-540 keV, 33-36 km/s Au4004+ cluster) impact on 1-layer free-standing graphene. The secondary ions were detected and recorded separately from each individual impact in the transmission direction using a time-of-flight mass spectrometer. We observed C1-10± ions emitted from graphene, the projectiles which penetrated the graphene, and the Au1-3± fragment ions in mass spectra. During the projectile-graphene interaction, the projectile loses â¼15% of its initial kinetic energy (â¼0.18 keV/atom, 72 keV/projectile). The Au projectiles are neutralized when approaching the graphene and then partially ionized again via electron tunneling from the hot rims of the holes on graphene, obtaining positive and negative charges. The projectile reaches an internal energy of â¼450-500 eV (â¼4400-4900 K) after the impact and then undergoes a â¼90-100 step fragmentation with the ejection of Au1 atoms in the experimental time range of â¼0.1 µs.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
J Chem Phys
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
Estados Unidos