Electronic Stopping Power in LiF from First Principles

Journal Article · Fri Dec 07 00:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.99.235501· OSTI ID:21024545

Pruneda, J M ^[1]; Sanchez-Portal, D ^[2]; Arnau, A; Juaristi, J I ^[2]; Artacho, Emilio ^[2]

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1. Instituto de Ciencia de Materiales de Barcelona (ICMAB-CSIC) Campus de Bellaterra, 08193 Barcelona (Spain)
2. Donostia International Physics Center, Paseo Manuel de Lardizabal 4, 20018 San Sebastian (Spain)

Using time-dependent density-functional theory we calculate from first principles the rate of energy transfer from a moving proton or antiproton to the electrons of an insulating material, LiF. The behavior of the electronic stopping power versus projectile velocity displays an effective threshold velocity of {approx}0.2 a.u. for the proton, consistent with recent experimental observations, and also for the antiproton. The calculated proton/antiproton stopping-power ratio is {approx}2.4 at velocities slightly above the threshold (v{approx}0.4 a.u.), as compared to the experimental value of 2.1. The projectile energy loss mechanism is observed to be extremely local.

• OSTI ID: 21024545
• Journal Information: Physical Review Letters, Vol. 99, Issue 23; Other Information: DOI: 10.1103/PhysRevLett.99.235501; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANTIPROTONS
DENSITY FUNCTIONAL METHOD
ELECTRONS
ENERGY LOSSES
ENERGY TRANSFER
LITHIUM FLUORIDES
PROTONS
STOPPING POWER
TIME DEPENDENCE
VELOCITY