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Radiation-Induced Conductivity in Amorphous Carbon


Jones, Todd Jarrott (1989) Radiation-Induced Conductivity in Amorphous Carbon. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/5A5K-T270.


Amorphous carbon films were irradiated with high energy chlorine ions with energies between 1 and 45 MeV. The electrical conductivity was measured in situ over a range of doses from 2 x 1010 to 5 x 1015 ions/cm2. It was found that the conductivity increases over three to four orders of magnitude. The variation of the conductivity with temperature is successfully fitted by a Mott hopping conduction model. The energy sensitivity of the effect (excitation curve) does not parallel the electronic stopping power of chlorine in carbon, but a multihit δ electron theory based on an ion-track model closely matches the excitation curve. The 1 and 2 MeV irradiations show he effect of nuclear stopping associated with low energy irradiatio

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Applied Physics
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Applied Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Tombrello, Thomas A.
Thesis Committee:
  • Tombrello, Thomas A. (chair)
  • Fultz, Brent T.
  • Housley, Robert M.
  • Johnson, William Lewis
  • Yariv, Amnon
Defense Date:5 April 1989
Additional Information:Title in 1989 commencement program -- Radiation Induced Conductivity in Amorphous Carbon -- differs slightly from title in thesis file (PDF).
Record Number:CaltechETD:etd-02022007-131335
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:466
Deposited By: Imported from ETD-db
Deposited On:20 Feb 2007
Last Modified:13 Aug 2021 00:35

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