Dissociative recombination of ammonia clusters studied by storage ring experiments.
Dissociative recombination of ammonia cluster ions with free electrons has been studied at the heavy-ion storage ring CRYRING (Manne Siegbahn Laboratory, Stockholm University). The absolute cross sections for dissociative recombination of H+(NH3)2, H+(NH3)3, D+(ND3)2, and D+(ND3)3 in the collision energy range of 0.001-27 eV are reported, and thermal rate coefficients for the temperature interval from 10 to 1000 K are calculated from the experimental data and compared with earlier results. The fragmentation patterns for the two ions H+(NH3)2 and D+(ND3)2 show no clear isotope effect. Dissociative recombination of X+(NX3)2 (X=H or D) is dominated by the product channels 2NX3+X [0.95+/-0.02 for H+(NH3)2 and 1.00+/-0.02 for D+(ND3)2]. Dissociative recombination of D+(ND3)3 is dominated by the channels yielding three N-containing fragments (0.95+/-0.05).
Ojekull
J
J
Department of Chemistry, Atmospheric Science, Göteborg University, SE-412 96 Göteborg, Sweden.
Andersson
P U
PU
Någård
M B
MB
Pettersson
J B C
JB
Neau
A
A
Rosén
S
S
Thomas
R D
RD
Larsson
M
M
Semaniak
J
J
Osterdahl
F
F
Danared
H
H
Källberg
A
A
Ugglas
M af
Ma