1. Department of Physics, University of Massachusetts, Hasbrouck Lab, 666 North Pleasant Street, Amherst, Massachusetts 01003, School of Physics, University of Edinburgh, Edinburgh, EH9 3JZ, U.K., INEST Group, Philip Morris USA Research Center, 4201 Commerce Road, Richmond, Virginia 23234, and Department of Mechanical and Industrial Engineering, University of Massachusetts, Gunness Lab, 160 Governors Drive, Amherst, Massachusetts 01003