astronomy

John Lawrence Freeouf

John Lawrence Freeouf is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand John Lawrence Freeouf rather than just read about it. In short: John Lawrence Freeouf (born 1947) is a materials scientist on the physics faculty of Portland State University. He is a Fellow of the American Physical Society and a Fellow of the American Vacuum Society.

Key takeaways

John Lawrence Freeouf belongs to astronomy; place it in that map before memorising details.
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Reproduce the core statement of John Lawrence Freeouf from memory before moving on to harder problems.

Reference excerpt

John Lawrence Freeouf (born 1947) is a materials scientist on the physics faculty of Portland State University. He is a Fellow of the American Physical Society and a Fellow of the American Vacuum Society. He has patented multiple inventions.

Early life and education Freeouf was born in Lincoln, Nebraska in 1947, the son of Leslie J. Freeouf and Janet Harriet (née Hodges) Freeouf. He married Barbara Curcic in 1975, and they have two daughters, Jennifer and Michellle. Freeouf earned a baccalaureate degree in physics at the University of Arizona in 1967. At the University of Chicago he completed both a Master of Science in physics in 1968, and also a Ph.D. in physics in 1973, with his dissertation titled Far-Ultraviolet Reflectance of ll-Vl Compounds and Correlation with Penn-Phillips Gap, advised by Hellmut Fritzsche.

Career From 1972 to 1973, Freeouf was a research fellow at Harvard University, Cambridge, Massachusetts. He was a research staff member at the International Business Machines Corporation Research Center, Yorktown Heights, New York, for two decades, from 1973 to 1993. He chaired the 1991 Electronic Materials and Photonics Division of the American Vacuum Society, and is a past Chairman of the Division of Electronic Materials and Processing of the American Vacuum Society. Hed became a Fellow of the American Vacuum Society in 1993. He left IBM in 1993 to found Interface Studies Inc., in Katonah, New York, serving as president and chief scientist of the company, "that specializes in materials-science problems primarily related to semiconductor technology". He became a Professor on the Physics Department faculty of Portland State University in 2000.

Honors and awards Freehouf, a 1990 recipient of an American Physical Society fellowship, in the Division of Condensed Matter Physics, was cited For application of surface-science techniques to the elucidation of semiconductor interfaces and for contributions to the physics of surface barriers. Freeouf chaired the EMPD division of the American Vacuum Society in 1991, became a Fellow of the American Vacuum Society in 1993, and was listed as a member of the AVS Forty Year Club in 2020.

Selected publications Freeouf, John L. (1973-04-15). "Far-Ultraviolet Reflectance of II-VI Compounds and Correlation with the Penn—Phillips Gap". Physical Review B. 7 (8): 3810–3830. doi:10.1103/PhysRevB.7.3810. ISSN 0556-2805. Eastman, D. E.; Freeouf, J. L. (1975-02-17). "Photoemission Partial State Densities of Overlapping p and d States for NiO, CoO, FeO, MnO, and Cr 2 O 3". Physical Review Letters. 34 (7): 395–398. doi:10.1103/PhysRevLett.34.395. ISSN 0031-9007. Woodall, J. M.; Freeouf, J. L.; Pettit, G. D.; Jackson, T.; Kirchner, P. (1981-09-01). "Ohmic contacts to n -GaAs using graded band gap layers of Ga1− x In x As grown by molecular beam epitaxy". Journal of Vacuum Science and Technology. 19 (3): 626–627. doi:10.1116/1.571074. ISSN 0022-5355. Freeouf, J. L.; Woodall, J. M. (1981-11-01). "Schottky barriers: An effective work function model". Applied Physics Letters. 39 (9): 727–729. doi:10.1063/1.92863. ISSN 0003-6951. Freeouf, J. L.; Jackson, T. N.; Laux, S. E.; Woodall, J. M. (1982-04-01). "Effective barrier heights of mixed phase contacts: Size effects". Applied Physics Letters. 40 (7): 634–636. doi:10.1063/1.93171. ISSN 0003-6951. Warren, A. C.; Woodall, J. M.; Freeouf, J. L.; Grischkowsky, D.; McInturff, D. T.; Melloch, M. R.; Otsuka, N. (1990-09-24). "Arsenic precipitates and the semi-insulating properties of GaAs buffer layers grown by low-temperature molecular beam epitaxy". Applied Physics Letters. 57 (13): 1331–1333. doi:10.1063/1.103474. ISSN 0003-6951. Melloch, M. R.; Otsuka, N.; Woodall, J. M.; Warren, A. C.; Freeouf, J. L. (1990-10-08). "Formation of arsenic precipitates in GaAs buffer layers grown by molecular beam epitaxy at low substrate temperatures". Applied Physics Letters. 57 (15): 1531–1533. doi:10.1063/1.103343. ISSN 0003-6951. Lim, Seung-Gu; Kriventsov, Stas; Jackson, Thomas N.; Haeni, J. H.; Schlom, D. G.; Balbashov, A. M.; Uecker, R.; Reiche, P.; Freeouf, J. L.; Lucovsky, G. (2002-04-01). "Dielectric functions and optical bandgaps of high-K dielectrics for metal-oxide-semiconductor field-effect transistors by far ultraviolet spectroscopic ellipsometry". Journal of Applied Physics. 91 (7): 4500–4505. doi:10.1063/1.1456246. ISSN 0021-8979. Edge, L. F.; Schlom, D. G.; Chambers, S. A.; Cicerrella, E.; Freeouf, J. L.; Holländer, B.; Schubert, J. (2004-02-02). "Measurement of the band offsets between amorphous LaAlO3 and silicon". Applied Physics Letters. 84 (5): 726–728. doi:10.1063/1.1644055. ISSN 0003-6951.

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Worked examples

Example 1 — a first encounter with John Lawrence Freeouf

Start with the simplest possible case. Write down what John Lawrence Freeouf claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to John Lawrence Freeouf before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about John Lawrence Freeouf ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of John Lawrence Freeouf

In research: John Lawrence Freeouf appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses John Lawrence Freeouf in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: John Lawrence Freeouf is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1947 births, 21st-century American physicists, Fellows of the American Physical Society, so understanding it makes those chapters shorter.
In everyday life: Look for John Lawrence Freeouf outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study John Lawrence Freeouf in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what John Lawrence Freeouf means in your own words.
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Frequently asked questions

What is John Lawrence Freeouf in simple terms?

Why does John Lawrence Freeouf matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study John Lawrence Freeouf?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on John Lawrence Freeouf.