Accession Number:

ADA207376

Title:

The Inadequacies of Damage Energy as a Measure of Displacement Damage

Descriptive Note:

Interim rept.

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s):

Report Date:

1989-04-10

Pagination or Media Count:

29.0

Abstract:

The Lindhard, Nielson, Scharff and Thompson equations for the partitioning of an ions energy into electronic and damage portions are widely used to estimate the number of displacements produced in a solid by an impinging ion. We have extended the LNST approach by including a displacement energy at all stages of the calculation, which allows us to form an integral equation that yields the number of displacements NvE directly, rather than estimating it from the damage energy DE. We compare our results with both the LNST approach and with the collision simulation code MARLOWE. We find that our approach approximates the MARLOWE results reasonably well, but the the damage energy is a poor estimator of displacement damage, because NvE and DE have different dependencies on the interatomic potential and on the low energy portion of the inelastic loss function. Keywords Displacement Damage energy.

Subject Categories:

  • Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE