title OPTICAL STUDY ON EXCITATION TRANSFER FROM He(23S,21S) TO NeI N A HELIUM FLOWING AFTERGLOW authors Masaharu Tsuji, Masahiro Hisano, and Yukio Nishimura affilation Institute of Advanced Material Study and Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka, Japan summary The excitation-transfer reactions from the metastable He(23S,21S) atoms to Ne have been studied by observing emission spectra of NeI lines in a helium afterglow. The formation rate coefficients of each product states were determined.