D. N Mcilroy - Univ. Rhode Island, dep. physics, Kingston RI 02881, United States
D Heskett - Univ. Rhode Island, dep. physics, Kingston RI 02881, United States
A. B Mclean - Univ. Rhode Island, dep. physics, Kingston RI 02881, United States
R Ludeke - Univ. Rhode Island, dep. physics, Kingston RI 02881, United States
H Munekata - Univ. Rhode Island, dep. physics, Kingston RI 02881, United States
N. J Dinardo - Univ. Rhode Island, dep. physics, Kingston RI 02881, United States