TY - JOUR
T1 - Laser resonance studies of the interactions of metastable antiprotonic helium atomcules p̄4He+ with surrounding H2 molecules
AU - Yamazaki, T.
AU - Ketzer, B.
AU - Widmann, E.
AU - Eades, J.
AU - Daniel, H.
AU - Hartmann, F. J.
AU - Hasinoff, M.
AU - Pohl, R.
AU - Schmidt, R.
AU - Von Egidy, T.
AU - Horváth, D.
AU - Kumakura, M.
AU - Morita, N.
AU - Sugai, I.
AU - Fujita, Y.
AU - Torii, H. A.
AU - Hori, M.
AU - Ishikawa, T.
AU - Maas, F. E.
AU - Tamura, H.
AU - Hayano, R. S.
N1 - Funding Information:
We are indebted to the LEAR and PS staff at CERN for their tireless operation of the antiproton beam facility. We would like to thank Professor H. Nakamura of the Institute for Molecular Science (Okazaki) for helpful discussions. The present work is supported by Grants-in-Aid for Specially Promoted Research and for International Scientific Research of the Japanese Ministry of Education, Science and Culture, the German Bundesministerium ftir Bildung, Wissenschaft, Forschung und Technologie and the Hungarian National Science Foundation. HAT acknowledges the support of the Japan Society for the Promotion of Science.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 1997/1/31
Y1 - 1997/1/31
N2 - We have employed a laser resonance method to study the interactions of individual states of metastable antiprotonic atomcules p̄He+ with surrounding H2 molecules. We have found that the lifetimes of the (n,l) = (37,34) and (39,35) states are shortened by small admixtures of H2 molecules in quite different ways; the observed quenching cross section for the upper (39,35) state in helium medium at 1 bar and 30 K is (2.4 ± 1.0) × 10-15 cm2, a factor of 24 larger than that for the lower (37,34) state.
AB - We have employed a laser resonance method to study the interactions of individual states of metastable antiprotonic atomcules p̄He+ with surrounding H2 molecules. We have found that the lifetimes of the (n,l) = (37,34) and (39,35) states are shortened by small admixtures of H2 molecules in quite different ways; the observed quenching cross section for the upper (39,35) state in helium medium at 1 bar and 30 K is (2.4 ± 1.0) × 10-15 cm2, a factor of 24 larger than that for the lower (37,34) state.
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U2 - 10.1016/S0009-2614(96)01398-X
DO - 10.1016/S0009-2614(96)01398-X
M3 - Article
AN - SCOPUS:0031592391
VL - 265
SP - 137
EP - 144
JO - Chemical Physics Letters
JF - Chemical Physics Letters
SN - 0009-2614
IS - 1-2
ER -