Ion-induced desorption of (H/sub 2/O)/sub n/H/sup +/ ion clusters

Journal Article · Wed Apr 15 04:00:00 EDT 1987 · J. Chem. Phys.; (United States)

OSTI ID:6813513

Christiansen, J W; Tsong, I S.T.; Lin, S H

The mass distribution of (H/sub 2/O)/sub n/H/sup +/ ion clusters desorbed from ice at 78 K was measured for 1less than or equal tonless than or equal to40. The desorption was induced by bombardment of the ice by three different primary ions, Ne/sup +/, Ar/sup +/, and Kr/sup +/ at 6 keV. The mass distribution can be described by RRK theory which fits the relative ion yields Y/sub n//Y/sub 1/, i.e., the ratio of the yield of the nth cluster to that of the first cluster, as a function of n. The energy deposited per normal mode required for desorption caused by each bombarding ion species is calculated from our theoretical fits to the experimental data. This is then compared with the energy deposited per mode estimated from the energy loss due to nuclear stopping of the bombarding ion in the ice. Reasonable agreement between the two is obtained. The existence of the ''magic number'' cluster ion (H/sub 2/O)/sub 4/H/sup +/ was observed in each of the three bombardment schemes.

• Research Organization: Department of Physics, Arizona State University, Tempe, Arizona 85287
• OSTI ID: 6813513
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 86:8; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ARGON IONS
BEAMS
CHARGED PARTICLES
COLLISIONS
DESORPTION
ENERGY RANGE
ICE
ION BEAMS
ION COLLISIONS
IONS
KEV RANGE
KEV RANGE 01-10
KRYPTON IONS
MASS SPECTRA
MOLECULAR IONS
NEON IONS
SORPTIVE PROPERTIES
SPECTRA
SURFACE PROPERTIES