Tunable monoenergy positron annihilation spectroscopy of polyethylene glycol thin films

Kuang Peng^{1, 2}, Han Xiao-Long³, Cao Xing-Zhong¹, Xia Rui¹, Zhang Peng¹, Wang Bao-Yi^{1, 2, †}

(color online) CDB ratios of PEG-2 (a) and PEG-10 (b) to LDPE in the surface and bulk at the positron incident energy 1 keV and 5 keV, respectively.