1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 1 Annihilation characteristics of positrons in free-standing thin metal and polymer films A. Uedono a, *, K. Ito a , H. Nakamori a , S. Ata b , T. Ougizawa b , K. Ito c , Y. Kobayashi c , X. Cao d , T. Kurihara d , N Oshima e , T. Ohdaira e , R. Suzuki e , T. Akahane f , M. Doyama g , K. Matsuya h , S. Jinno i , and M. Fujinami i a Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki, 305-8573, Japan b Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8552, Japan c National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, 305-8565, Japan d Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki, 305-0801, Japan e Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, 305-8568, Japan f Advanced Nanomaterials Lab., National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan g Teikyo University of Science and Technology, Uenohara, Yamanashi, 409-0193, Japan h Japan Electron Optics Laboratory (JEOL) Ltd., Akishima, Tokyo 196-0021, Japan i Department of Applied Chemistry, Chiba University, Yayoi, Inage, Chiba 263-8522, Japan Annihilation characteristics of positrons and positronium (Ps) in thin metal and © 2007. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/