ESR study on the spatial distribution of radicals trapped in the heavy ion-irradiated n-eicosane single crystal

Journal Article · Wed Jan 01 04:00:00 EST 1975 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.431555· OSTI ID:4195148

Kimura, Kazuie; Ogawa, Mariko; Matsui, Masao; Karasawa, Takashi; Imamura, Masashi; Tabata, Yoneho; Oshima, Keichi

Single crystals of n-eicosane were subjected to the irradiation of helium, carbon, and nitrogen ions accelerated with the cyclotron, and the results were compared with those obtained by ⁶⁰Co γ-ray irradiation. Irradiation was carried out at 77 °K. The nature and the spatial distribution of free radicals produced in the crystals were investigated by an ESR technique. The principal radical is --CH ₂CHCH₂-- (I) and the minor one, CH₃CHCH₂-- (II); the linewidth and decay of these radicals were found to be LET-dependent. The ESR results indicate that radicals are trapped in two regions closely and sparsely; the relative distribution in the two regions is dependent on the LET of radiations used. The mean separation between the radicals trapped in the close proximity was estimated to be approximately 16 A.

• Research Organization: The Institute of Physical and Chemical Research, Wako, Saitama 351, Japan
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-000096
• OSTI ID: 4195148
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 5 Vol. 63; ISSN JCPSA6; ISSN 0021-9606
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

Related Subjects

*ALKANES-- RADIOLYSIS
*RADICALS-- ELECTRON SPIN RESONANCE
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
CARBON IONS
GAMMA RADIATION
HELIUM IONS
LOW TEMPERATURE
MEV RANGE 10-100
MONOCRYSTALS
NITROGEN IONS