Spelling suggestions: "subject:"field ion microscope."" "subject:"yield ion microscope.""
1 |
Image formation in the field-ion microscopeSouthon, Michael John January 1963 (has links)
No description available.
|
2 |
A scanning ion microscope with a field ionization source /Orloff, Jonathan Harris. January 1976 (has links)
Thesis (Ph. D.)--Oregon Graduate Center, 1976.
|
3 |
Scanning ion microscope with a field ionization sourceOrloff, Jonathan Harris 12 1900 (has links) (PDF)
Ph.D. / Applied Physics / This work was undertaken to determine the feasibility of using a field ionization (FI) source to produce fine focus ion beams. Operating parameters for a FI source have been measured and a source sensitivity of ~ 5 x 10[superscript-5] A sr[superscript -1] torr[superscript -1] was found for both H[subscript 2] and Ar at 77 K. The source is gas phase, differentially pumped with typical operating pressures of 1 - 30 x 10[superscript -3] torr at 77 K, resulting in a maximum source brightness ≈ 10[superscript 8] A cm[superscript -2] sr[superscript -1] and angular intensity of ≈ 10[superscript -6] A sr[superscript -1] with beam energies of 10 - 20 keV. Angular distributions were measured and found to be uniform near θ = 0°, with the beam confined to ±20°. A scanning ion microscope (SIM) was built to further evaluate the source. The SIM has been operated with currents on the specimen of 10[superscript -11] – 10[superscript -10 amperes in the secondary electron mode with contrast provided primarily by the sec (θ) dependence of the secondary electron yield, where θ is the angle between the beam and the specimen normal. Secondary electrons are detected and amplified with a channeltron multiplier and images generated as with a conventional SEM. All electrostatic optics are used in a doublet arrangement, and with this configuration current is independent of working distance which is 3 - 4 cm. A current of 5 x 10[superscript -11] A was focused into a spot of ≈ 6500 Å with H[subscript 2] gas, the resolution being limited by chromatic aberration caused by the ≈ 4 eV energy spread of the two component (H[superscript +] H[superscript +, subscript 2]) beam. Signal to noise ratio measurements on the source made at the specimen position show that the bulk of the noise power spectrum falls below f = 30 Hz.
|
4 |
Field-ion microscope investigations of fine structures in as-quenched and tempered ferrous martensite.Ranganathan, Brahmanpalli Narasimhamurthy 05 1900 (has links)
No description available.
|
5 |
Field-ion microscope studies on surface properties of titanium .Kumar, Rajinder 08 1900 (has links)
No description available.
|
6 |
Field ion microscope studies on surface energy anisotropy and faceting behavior of metals.Kumar, Rajinder 08 1900 (has links)
No description available.
|
Page generated in 0.0613 seconds