Dependence of secondary ion emission from organic material on the energy loss of the impacting heavy ion

Conference · Tue Dec 31 00:00:00 EST 1991

OSTI ID:10152678

Hunt, J E ^[1]; Wien, K ^[2]

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1. Argonne National Lab., IL (United States)
2. Technische Hochschule Darmstadt (Germany). Inst. fuer Kernphysik

Samples of the amino acid valine were irradiated by 2.5 MeV-Ar, 0.8 MeV-Kr and 1.0 MeV Xe beams from the Argonne Dynamitron accelerator in order to study the energy distributions of ejected secondary ions. For Kr and Xe the nuclear stopping power exceeded the electronic stopping power by a factor 2 or 3, respectively, but the functional shape of the energy distributions and the mean ejection energies (0.9--1.4 eV) indicated that the molecular ions (M{plus_minus}H){sup {plus_minus}} are desorbed by an electronic sputter process. Contributions of atomic collision cascades were observed for the H{sup {minus}} ion. In the second part of the article, the overall dependence of molecular ion yields on the electronic energy loss is discussed in the framework of recent desorption models and the structure of the nuclear track.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10152678
• Report Number(s): ANL/CP-76036; CONF-9108199-1; ON: DE92014845
• Resource Relation: Conference: Latin American school of physics,Caxambu (Brazil),4-24 Aug 1991; Other Information: PBD: [1991]
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ORGANIC COMPOUNDS
ION EMISSION
SPUTTERING
SECONDARY EMISSION
ION-MOLECULE COLLISIONS
HEAVY ION ACCELERATORS
KEV RANGE 100-1000
MEV RANGE 01-10
VALINE
ENERGY SPECTRA
DESORPTION
PARTICLE TRACKS
HYDROGEN IONS 1 MINUS
665300
INTERACTIONS BETWEEN BEAMS AND CONDENSED MATTER