title: Three-dimensional hydrogen microscopy in diamond.
abstract: A microprobe of protons with an energy of 17 million electron volts is used to quantitatively image three-dimensional hydrogen distributions at a lateral resolution better than 1 micrometer with high sensitivity. Hydrogen images of a <110>-textured undoped polycrystalline diamond film show that most of the hydrogen is located at grain boundaries. The average amount of hydrogen atoms along the grain boundaries is (8.1 +/- 1.5) x 10(14) per square centimeter, corresponding to about a third of a monolayer. The hydrogen content within the grain is below the experimental sensitivity of 1.4 x 10(16) atoms per cubic centimeter (0.08 atomic parts per million). The data prove a low hydrogen content within chemical vapor deposition-grown diamond and the importance of hydrogen at grain boundaries, for example, with respect to electronic properties of polycrystalline diamond.
authors.affiliation: Physik Department E12, Technische Universität (TU) München, 85748 Garching, Germany. p.reichart@ph.unimelb.edu.au
authors.forename: P
authors.initials: P
authors.lastname: Reichart
authors.forename: G
authors.initials: G
authors.lastname: Datzmann
authors.forename: A
authors.initials: A
authors.lastname: Hauptner
authors.forename: R
authors.initials: R
authors.lastname: Hertenberger
authors.forename: C
authors.initials: C
authors.lastname: Wild
authors.forename: G
authors.initials: G
authors.lastname: Dollinger