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Contributions 1982 (1982)
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TABLE OF CONTENTS

Properties of ions and clusters

Studies of clusters in the gas phase and application
to an understanding of transitions from the
gaseous to the surface and condensed state
A.W. Castleman, Jr. 1

Cluster properties studied by electron impact
ionization

T.D. Mark, K. Stephan, H. Helm, J.H. Futrell,
E. Mark, K.I. Peterson, A.W. Castleman,
N. Djuric and A. Stamatovic 7

Charged Water- and CO_-clusters

M. Armbruster, H. Haberland and H.G. Schindler 19

A molecular dynamics study of the collision induced
dissociation reactions of CH4 + and C3H8" 1 " at
electron volt collision energies
J.H. Futrell, Z. Herman and B. Friedrich 25

Recent experiments on the excitation and decay of
small molecular ions
T.R. Govers 3o

1 w 1

On the metastable decay process N_0 -*- NO + N

E. Mark, T.D. Mark, Y.B. Kim and K. Stephan 37

Metastable transitions as an evidence for several
ion-molecule reactions in S0 2 at low pressure
A. Stamatovic and M. Miletic 42

Unimolecular and collision induced dissociation of
Ar, N and ArN~ cluster ions
K. Stephan and T.D. Mark 48

Composition measurements of stratospheric ions

F. Arnold 54

Silicon negative ion chemistry in the atmosphere -
in situ and laboratory measurements
A.A. Viggiano, F. Arnold, D.W. Fahey,
F.C. Fehsenfeld and E.E. Ferguson 65

(e,2e) experiments on He at intermediate energy
(4oo-16oo eV)

R. Camilloni, R. Fantoni, A. Giardini-Guidoni
M. Rosi, G. Stefani and A. Zecca 7o

Deviation of cracking patterns and their influence
on RGA-accuracy
A. Breth and R. Dobrozemsky 75

Photodetachment of electrons from negative ions

J.R. Peterson 79