Equilibrium Charge Distributions of Helium Beams in Various Gases

Equilibrium charge distributions of 0.7–2.0 MeV helium beams have been measured in target gases H 2 , He, N 2 , O 2 , CO 2 , CH 4 , C 2 H 6 and C 3 H 8 . Present results are in fairly good agreement with other experimental data in H 2 , He and N 2 . Absence probabilities of bound electrons in He 0 and He + projectiles are estimated by using the equilibrium fractions and the theory of Dmitriev is supportable in this energy region. Average charges in these gases have the following relation; q : H 2 >CH 4 \(\)C 3 H 8 >C 2 H 6 >N 2 >CO 2 >O 2 >He. T h e m a x i m u m d i f f e r e n c e o f q a m o n g t h e s e g a s e s i s a b o u t 0.27 u n i t s o f c h a r g e . T h e h i g h a v e r a g e c h a r g e s i n h y d r o g e n - c o n t a i n i n g m o l e c u l e s a r e a t t r i b u t e d t o t h e s m a l l c a p t u r e c r o s s s e c t i o n s .