Observation of many coherent oscillations for MeV protons transmitted through stacking faults.
High spatial resolution, high-contrast transmission channeling images of stacking faults in silicon have been produced using a beam of 2 MeV protons focused to a spot size of 60 nm. Over a narrow range of beam tilts to the (011) planes, up to ten periodic intensity oscillations are observed, providing evidence of a long-range coherency of the planar channeled trajectories. This behavior is characterized using Monte Carlo computer simulations, and a phase-space model of planar channeled ion interactions with stacking faults is developed which incorporates all observed channeling and blocking phenomena.
Physics Department, National University of Singapore, 10 Lower Kent Ridge Road, Singapore 119260.
M B H
MB
Breese
E J
EJ
Teo
M A
MA
Rana
L
L
Huang
J A
JA
van Kan
F
F
Watt
P J C
PJ
King