Neutrino-recoil induced desorption

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States)

DOI:https://doi.org/10.1116/1.579133· OSTI ID:6643552

Zhu, L; Avci, R; Lapeyre, G J ^[1]; Hindi, M M; Kozub, R L; Robinson, S J ^[2]

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1. Physics Department, Montana State University, Bozeman, Montana 59717 (United States)
2. Department of Physics, Tennessee Technological University, Cookeville, Tennessee 38505 (United States)

Nuclear decay induced [sup 37]Cl ion desorption from the electron capture decay [sup 37]Ar[r arrow][sup 37]Cl+[nu] is reported for the first time. A mixture of one part [sup 36]Ar and [similar to]5[times]10[sup [minus]5] parts [sup 37]Ar ([sup 36/37]Ar) is physisorbed on a gold-plated Si wafer kept at 16 K under ultrahigh vacuum conditions. The time of flight (TOF) of recoiled [sup 37]Cl ions is measured using coincidence techniques. The observed kinetic energy distribution of the [sup 37]Cl ions is approximately Gaussian in shape, with a maximum at [approx]9.0 eV and a full width at half-maximum of [similar to]3 eV. Considering the binding energy of physisorbed [sup 37]Ar is [similar to]80 meV, the 9-eV peak energy compares well with that of the gas-phase value, where conservation of the energy and momentum fixes the kinetic energy of [sup 37]Cl ions at 9.54 eV. Using a combination of TOF and retarding field energy analysis, the charge states of detected ions for 1 ML (monolayer) of [sup 36/37]Ar are determined as 53%+1[ital e], 21%+2[ital e], and 26%+[ital ne], where [ital n][ge]3. The fraction of decaying [sup 37]Ar atoms which emerge from the surface as positive [sup 37]Cl ions is found to be 10%. Finally, a strong charge exchange reaction between a [sup 37]Cl ion and near-neighbor atoms causes a Coulomb explosion within the multilayers, increasing the kinetic energy of desorbing ions by as much as [similar to]7 eV.

• OSTI ID: 6643552
• Journal Information: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States), Journal Name: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States) Vol. 12:4; ISSN 0734-2101; ISSN JVTAD6
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BETA DECAY
CHARGE EXCHANGE
CHARGE STATES
CHLORINE 37
CHLORINE ISOTOPES
DECAY
DESORPTION
ELECTRON CAPTURE DECAY
ELEMENTARY PARTICLES
FERMIONS
ISOTOPES
LEPTONS
LIGHT NUCLEI
MASS
MASSLESS PARTICLES
NEUTRINOS
NUCLEAR DECAY
NUCLEI
ODD-EVEN NUCLEI
RECOILS
SORPTION
STABLE ISOTOPES
TIME-OF-FLIGHT METHOD