Physical Sciences and Mathematics Commons^™

Auger Analysis Of Si–H Bonding And Hydrogen Concentration In Hydrogenated Amorphous Silicon, Nancy Burnham, Aj Nelson, Ab Schwartzlander, Se Asher, Ll Kazmerski

Nancy A. Burnham

Auger electron spectroscopy line‐shape analysis of the Si‐L 2 3 V V peak has been performed on hydrogenated amorphous silicon (a‐Si:H). Both a‐Si:H produced by hydrogen implantation of siliconsingle crystals (for analytical standards) and thin films (fabricated for solar cell applications) were examined in these studies. Hydrogen concentrations were confirmed by secondary ion mass spectrometry, and samples having hydrogen content over the range 101 6–102 2 cm− 3 were evaluated. Correlations between the area under the deconvoluted L 2 3 V V transition peak and the known hydrogen content have resulted in a semiquantitative method of determining hydrogen concentration using …

Scanning Auger Microprobe Studies Of Ball Cratered Cds/Cuinse2 Solar Cells, Nancy Burnham, Ll Levenson, Rj Matson, R Noufi, Ll Kazmerski

Nancy A. Burnham

CdS/CuInSe2solar cell films are typically several micrometers thick. Composition profiles of these films are usually carried out on fracture cross sections by scanning Auger microscopy or by recording Auger spectra during ion milling. For fracture cross sections, the depth resolution depends on the electron beam diameter and the roughness of the fracture surface. Ion milling is time consuming, and artifacts are caused by ion beam faceting. Ball cratering requires only a fraction of an hour and provides significant magnification of the film cross section. There is sufficient contrast, both in optical and electron microscopy, to distinguish between CdS and CuInSe2 …

Improvement Of Trace Aluminum Determination By Electrothermal Atomic Absorption Spectrophotometry Using Phosphoric Acid, Chris Craney, Kurt Swartout, F. Smith, C. West

Chris L. Craney

No abstract provided.

Electrochemical Reduction Of Alkyl Halides At Vitreous Carbon Cathodes In Dimethylformamide, James Cleary, Mohammed Mubarak, Kenneth Viera, Mark Anderson, Dennis Peters

Mark R. Anderson

At vitreous carbon electrodes in dimethylformamide which contains tetramethylammonium perchlorate, cyclic voltammograms for 1-iododecane, 1-bromodecane, and 2-bromooctane consist of one irreversible reduction wave signaling formation of the alkyl carbanion, whereas voltammograms for 2-iodooctane, t-butyl bromide, and t-butyl iodide reveal stepwise generation of the alkyl radical and carbanion. Large-scale electrolysis of 1-iododecane at reticulated vitreous carbon yields decane, eicosane, 1-decene, and 1-decanol; the first two compounds arise, respectively, from reaction of decyl carbanions with a proton donor and with unreduced alkyl iodide, whereas the last two species are produced via chemical attack of hydroxide ion on 1-iododecane. Reduction of 1-bromodecane results …

Electrochemistry Of 1,1,4,4-Tetraphenyl-1,3-Butadiene, 1,1,4,4-Tetraphenyl-1,2-Butadiene, And 1,1,4,4-Tetraphenyl-1-Butene In Dimethylformamide, Tsu-Yu Chen, Mark Anderson, Dennis Peters

Mark R. Anderson

In dimethylformamide containing tetra-n-butylammonium perchlorate, 1,1,4,4-tetraphenyl-1-butene exhibits a single polarographic wave; preparative-scale reduction of the starting material produces 1,1,4,4-tetraphenylbutane.A polarogram for 1,1,4,4-tetraphenyl-1,3-butadiene consists of three waves. Large-scale electrolysis of 1,1,4,4-tetraphenyl-1,3-butadiene at potentials corresponding to either the first or second wave yields 1,1,4,4-tetraphenyl-1-butene in the absence of a proton donor and a mixture of 1,1,4,4-tetraphenyl-2-butene and 1,1,4,4-tetraphenyl-1-butene in the presence of excess glacial acetic acid. If 1,1,4,4-tetraphenyl-1,3-butadiene is electrolyzed at a potential on the third polarographic wave, one obtains 1,1,4,4-tetraphenylbutane in the absence of a proton donor but a mixture of 1,1,4,4-tetraphenyl-2-butene and 1,1,4,4-tetraphenylbutane in the presence of glacial acetic acid. …

A Highly Enantioselective Hydrolysis Of -3,5-Diacetoxycyclopent-1-Ene, Donald Deardorff, A. Matthews, D. Mcmeekin, Chris Craney

Chris L. Craney

Exposure of -3,5-diacetoxycyclopent-1-ene () to the hydrolase enzyme acetylcholinesterase (from electric eel) affords In 94% yield 3()-acetoxy-5()-hydroxycyclopent-1-ene () with an e.e. of 96% (greater than 99% e.e. after one recrystallization).

Solution Of Systems With Toeplitz Matrices Generated By Rational Functions, William F. Trench

William F. Trench

No abstract provided.

Extensions Of A Theorem Of Wintner On Systems With Asymptotically Constant Solutions, William F. Trench

William F. Trench

No abstract provided.

Spectral Properties Of Percolating Central Force Elastic Networks, Anthony Day, R. Tremblay, A.-M. Tremblay

Anthony Roy Day

The exponent describing the low frequency spectrum of vibrations for the central force universality class is computed with both the Coherent Potential Approximation and numerical simulations. The results of both calculations agree surprisingly well.

Predictors Of Grades In General Chemistry For Allied Health Students, Chris Craney, R. Armstrong

Chris L. Craney

Study searching for an effective predictor of student performance in the first term of a full-year general chemistry sequence for allied health students.

Quantitative Evaluation Of Enhancement Techniques, B. L. Deekshatulu, Arun D. Kulkarni, G. Kashipati Rao

Arun Kulkarni

Eventual Disconjugacy Of A Linear Differential Equation Ii, William F. Trench

William F. Trench

No abstract provided.

On The Eigenvalue Problem For Toeplitz Band Matrices, William F. Trench

William F. Trench

No abstract provided.

Asymptotic Theory Of Perturbed General Disconjugate Equations Ii, William F. Trench

William F. Trench

No abstract provided.

Asymptotic Behavior Of Solutions Of An N-Th Order Differential Equation, William F. Trench

William F. Trench

No abstract provided.

Asymptotics Of Differential Systems With Deviating Arguments, William F. Trench

William F. Trench

No abstract provided.

A Rapid Affinity Chromatography Procedure For The Isolation Of Glucose-6-Phosphate Dehydrogenase From Human Erythrocytes, Chris Craney, M. Goffredo

Chris L. Craney

The isolation of glucose-6-phosphate dehydrogenase from outdated human erythrocytes (type AB+) utilizing NADP+ affinity chromatography and gel-permeation chromatography (Bio-Gel P-150) yields a fully active, homogeneous preparation. The procedure is faster and gives a higher yield than previous reports.

Structural Properties Of Ideals, J. Baumgartner, A. Taylor, Stan Wagon

Stan Wagon, Retired

No abstract provided.

Asymptotic Theory Of Perturbed General Disconjugate Equations, William F. Trench

William F. Trench

No abstract provided.

An Oscillation Condition For Differential Equations Of Arbitrary Order, William F. Trench

William F. Trench

No abstract provided.

Interpolating Functions Associated With Second Order Differential, William F. Trench

William F. Trench

No abstract provided.

Band Matrices With Toeplitz Inverses, William F. Trench, T N. E. Greville

William F. Trench

No abstract provided.

Proof Of A Conjecture Of Askey On Orthogonal Expansions With Positive Coefficients, William F. Trench

William F. Trench

No abstract provided.

Oscillation Properties Of Perturbed Disconjugate Equations, William F. Trench

William F. Trench

No abstract provided.

A Sufficient Condition For Eventual Disconjugacy, William F. Trench

William F. Trench

No abstract provided.

Canonical Forms And Principal Systems For General Disconjugate Equations, William F. Trench

William F. Trench

No abstract provided.

On Generalized Matrix Functions, John Hawkins, Adi Ben-Israel

John B. Hawkins

No abstract provided.

Strong Discrete Minimum Variance Estimation Of A Polynomial Plus Random Noise, William F. Trench

William F. Trench

No abstract provided.

Asymptotic Behavior Of Solutions Of Lu=G(T,U,Dots,U^(K-1)), William F. Trench

William F. Trench

No abstract provided.

Discrete Minimum Variance Smoothing Of A Polynomial Plus Random Noise, William F. Trench

William F. Trench

No abstract provided.