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Bulgarian Journal of Physics
Print: 1310-0157 Online: 1314-2666
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RECOGNIZED BY THE EUROPEAN PHYSICAL SOCIETY 
Bulg. J. Phys. vol.27 no.S1 (2000), pp. 115-118
Parity Unfavoured Transitions from Double Excited States of Helium
M. Doğan1, A. Crowe2
1Kocatepe University, Science Faculty, Physics Department, Afyon, Turkey
2Department of Physics, University of Newcastle, Newcastle, UK
go back1Kocatepe University, Science Faculty, Physics Department, Afyon, Turkey
2Department of Physics, University of Newcastle, Newcastle, UK
Abstract. The excitation of the parity-unfavoured states of helium by electron impact has been measured around threshold energy regions. This was done by observing the VUV radiation at 32 nm emitted in the decay of the (2p2)3P state to the single excited (1s2p)3P state. In the threshold region clear evidence is found for the occurrence of negative-ion resonances.