# Ion channeling revisited

## Abstract

A MS Excel program has been written that calculates accidental, or unintentional, ion channeling in cubic bcc, fcc and diamond lattice crystals or polycrystalline materials. This becomes an important issue when simulating the creation by energetic neutrons of point displacement damage and extended defects using beams of ions. All of the tables and graphs in the three Ion Beam Analysis Handbooks that previously had to be manually looked up and read from were programed into Excel in handy lookup tables, or parameterized, for the case of the graphs, using rather simple exponential functions with different powers of the argument. The program then offers an extremely convenient way to calculate axial and planar half-angles and minimum yield or dechanneling probabilities, effects on half-angles of amorphous overlayers, accidental channeling probabilities for randomly oriented crystals or crystallites, and finally a way to automatically generate stereographic projections of axial and planar channeling half-angles. The program can generate these projections and calculate these probabilities for axes and [hkl] planes up to (555).

- Authors:

- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

- Publication Date:

- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA), Office of Defense Science (NA-113)

- OSTI Identifier:
- 1323323

- Report Number(s):
- SAND2014-18131

540783; TRN: US1700278

- DOE Contract Number:
- AC04-94AL85000

- Resource Type:
- Technical Report

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; FCC LATTICES; ION CHANNELING; BCC LATTICES; POLYCRYSTALS; NEUTRONS; DIAMONDS; DATA; DIAGRAMS; MANUALS; PROBABILITY; POINT DEFECTS; FUNCTIONS; LAYERS; COMPUTER CODES; YIELDS

### Citation Formats

```
Doyle, Barney Lee, Corona, Aldo, and Nguyen, Anh.
```*Ion channeling revisited*. United States: N. p., 2014.
Web. doi:10.2172/1323323.

```
Doyle, Barney Lee, Corona, Aldo, & Nguyen, Anh.
```*Ion channeling revisited*. United States. doi:10.2172/1323323.

```
Doyle, Barney Lee, Corona, Aldo, and Nguyen, Anh. Mon .
"Ion channeling revisited". United States.
doi:10.2172/1323323. https://www.osti.gov/servlets/purl/1323323.
```

```
@article{osti_1323323,
```

title = {Ion channeling revisited},

author = {Doyle, Barney Lee and Corona, Aldo and Nguyen, Anh},

abstractNote = {A MS Excel program has been written that calculates accidental, or unintentional, ion channeling in cubic bcc, fcc and diamond lattice crystals or polycrystalline materials. This becomes an important issue when simulating the creation by energetic neutrons of point displacement damage and extended defects using beams of ions. All of the tables and graphs in the three Ion Beam Analysis Handbooks that previously had to be manually looked up and read from were programed into Excel in handy lookup tables, or parameterized, for the case of the graphs, using rather simple exponential functions with different powers of the argument. The program then offers an extremely convenient way to calculate axial and planar half-angles and minimum yield or dechanneling probabilities, effects on half-angles of amorphous overlayers, accidental channeling probabilities for randomly oriented crystals or crystallites, and finally a way to automatically generate stereographic projections of axial and planar channeling half-angles. The program can generate these projections and calculate these probabilities for axes and [hkl] planes up to (555).},

doi = {10.2172/1323323},

journal = {},

number = ,

volume = ,

place = {United States},

year = {Mon Sep 01 00:00:00 EDT 2014},

month = {Mon Sep 01 00:00:00 EDT 2014}

}