The collision of a hypervelocity massive projectile with free-standing graphene: Investigation of secondary ion emission and projectile fragmentation.
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 ∼15% of its initial kinetic energy (∼0.18 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 ∼450-500 eV (∼4400-4900 K) after the impact and then undergoes a ∼90-100 step fragmentation with the ejection of Au1atoms in the experimental time range of ∼0.1 μs.
Department of Chemistry, Texas A&M University, College Station, Texas 77843-3144, USA.
Sheng
S
Geng
Department of Chemistry, Texas A&M University, College Station, Texas 77843-3144, USA.
Stanislav V
SV
Verkhoturov
Department of Chemistry, Texas A&M University, College Station, Texas 77843-3144, USA.
Michael J
0000000290692180
MJ
Eller
Institut de Physique Nucléaire d'Orsay, Université Paris-Sud 11, UMR8608, CNRS/IN2P3, Orsay F-91406, France.
Serge
0000000221163744
S
Della-Negra
Department of Chemistry, Texas A&M University, College Station, Texas 77843-3144, USA.
Emile A
0000000339647998
EA
Schweikert