Stopping power of fluorides and semiconductor organic films for low-velocity protons

Journal Article · Mon Feb 15 00:00:00 EST 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.022902· OSTI ID:21408248

Serkovic Loli, L N; Sanchez, E A; Grizzi, O; Arista, N R ^[1]

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1. Centro Atomico Bariloche-CNEA, Instituto Balseiro-UNCuyo, CONICET 8400 S. C. de Bariloche, Rio Negro (Argentina)

A combined experimental and theoretical study of the energy loss of protons in fluorides and organic films is presented. The measurements were performed in fresh AlF{sub 3}, LiF, and N,N{sup '}-bis(1-ethylpropyl)-perylene-3,4,9,10-tetracarboxdiimide (EP-PTCDI) evaporated in situ on self-supported C or Ag foils, covering the very low energy range from 25 keV down to 0.7 keV. The transmission method is used in combination with time-of-flight (TOF) spectrometry. In the case of fluorides with large band gap energies (AlF{sub 3} and LiF), the experimental stopping power increases almost linearly with the mean projectile velocity showing a velocity threshold at about 0.1 a.u. These features are well reproduced by a model based on quantum scattering theory that takes into account the velocity distribution and the excitation of the active 2p electrons in the F{sup -} anions, and the properties of the electronic bands of the insulators. In the case of the semiconductor organic film with a lower gap, the experimental stopping power increases linearly with the mean projectile velocity without presenting a clear threshold. This trend is also reproduced by the proposed model.

• OSTI ID: 21408248
• Journal Information: Physical Review. A, Vol. 81, Issue 2; Other Information: DOI: 10.1103/PhysRevA.81.022902; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ALUMINIUM FLUORIDES
ANIONS
ENERGY LOSSES
EXCITATION
FILMS
FLUORINE IONS
FOILS
KEV RANGE
LITHIUM FLUORIDES
PERYLENE
PROTONS
SCATTERING
SEMICONDUCTOR MATERIALS
SPECTROSCOPY
STOPPING POWER
TIME-OF-FLIGHT METHOD
VELOCITY
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
AROMATICS
BARYONS
CHARGED PARTICLES
CONDENSED AROMATICS
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
FERMIONS
FLUORIDES
FLUORINE COMPOUNDS
HADRONS
HALIDES
HALOGEN COMPOUNDS
IONS
LITHIUM COMPOUNDS
LITHIUM HALIDES
LOSSES
MATERIALS
NUCLEONS
ORGANIC COMPOUNDS