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  • Analytical Chemistry and Spectroscopy  (21)
  • Instrumentation and Photography  (17)
  • 1
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    Analysis of Random Segment Errors on Coronagraph Performance (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: At 2015 SPIE O&P we presented "Preliminary Analysis of Random Segment Errors on Coronagraph Performance" Key Findings: Contrast Leakage for 4thorder Sinc2(X) coronagraph is 10X more sensitive to random segment piston than random tip/tilt, Fewer segments (i.e. 1 ring) or very many segments (〉 16 rings) has less contrast leakage as a function of piston or tip/tilt than an aperture with 2 to 4 rings of segments. Revised Findings: Piston is only 2.5X more sensitive than Tip/Tilt
    Keywords: Instrumentation and Photography
    Type: MSFC-E-DAA-TN32194
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
    Electronic Resource
    Electronic Resource
    Matrix-assisted laser desorption/ionization mass spectrometry of nucleic acids with wavelengths in the ultraviolet and infrared (1992)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 6 (1992), S. 771-776 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A number of different matrices have been tested and compared for ultraviolet and ubfrared (UV and IR) matrix-assisted lasedr desorption/ionization (MALDI) of oligodeoxyribonucleotides and mixtures thereof, as well as ribonucleic acids (tRNA from yeast and rRNA from Ecoli). A new technique for removing alkali cations from nucleic acid samples during sample preparation on the sample support is demonstrated. The amount of oligonucleotide sample consumed during a typical measurement in IR-MALDI-MS was determined.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290061212
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  • 3
    Electronic Resource
    Electronic Resource
    The use of hydrogen-deuterium exchange to facilitate peptide sequencing by electrospray tandem mass spectrometry (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 58-62 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The utility of hydrogen-deuterium exchange for sequencing peptides by mass spectrometry is demonstrated. The number of exchangeable hydrogens in a peptide is readily obtained by electrospray analysis of the peptide dissolved in deuterated solvents. This information can be used, in conjunction with published computer algorithms for interpreting peptide mass spectra, to reduce significantly the number of candidate sequences that fit the experimentsl data. This information, when combined with fragment-ion information in the mass spectrum, greatly increases the reliability of sequence determination.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290070114
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  • 4
    Electronic Resource
    Electronic Resource
    Sur le calcul a priori des déplacements chimiques de 1H et de 19FCe mémoire recouvre en partie le travail de la Thèse de Doctorat d'Etat ès Sciences Physiques de Madame H. Stahl-Larivière présentée à l'Université Paris-Sud. Centre Scientifique d'Orsay en 1973 (CNRS A09094). (1974)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 6 (1974), S. 170-177 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: We propose a new method for calculating 1H and 19F chemical shifts in saturated organic compounds. Results show that the shifts are a balance of several contributions and allow an evaluation of these effects: a diamagnetic contribution d( - ∊) proportional to the net charge ∊ of the electronic environment of the nucleus considered and paramagnetic contributions pX of each of substituents, constant attached to the substituent X in any molecule. For both nuclei, d values were deduced from a theoretical calculation of the screen in the free atom. This method, using a restricted number of parameters obtained from experiment, lead to the observed chemical shifts with a mean accuracy of ± 0,32 ppm for 1H and ± 11 ppm for 19F. Therefore this method gives a simple quantitative relation between chemical shift and structure from which precise indications about the origin of the contributions from neighbouring electronic surroundings can be obtained.
    Notes: Nous proposons une nouvelle méthode de calcul du déplacement chimique de 1H et de 19F dans les molécules organiques saturées. Les résultats obtenus montrent que celui-ci est le bilan de plusieurs contributions et permettent une évaluation de celles-ci: une contribution diamagnétique d( - ∊) proportionnelle à la charge nette ∊ de l'environnement électronique du noyau étudié et des contributions paramagnétiques pX de chacun des substituants géminés, constantes pour chaque substituant X lorsqu'on passe d'une molécule à une autre. Pour les deux noyaux, les valeurs de d utilisées sont déduites des calculs théoriques de l'écran dans l'atome libre. Cette méthode, qui n'utilise qu'un nombre très restreint de paramètres déduits de l'expérience nous a permis de retrouver les déplacements chimiques expérimentaux avec un écart moyen, pour 1H de ± 0,32 ppm, pour 19F de ± 11 ppm. Elle a donc l'interêt de fournir une relation quantitative simple entre déplacement chimique et structure permettant de dégager des indications précises sur l'origine des contributions des environnements voisins.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270060309
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  • 5
    Electronic Resource
    Electronic Resource
    The mass spectrum of 1-heptyl iodide (1977)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 12 (1977), S. 761-765 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of twelve 13C labeled compounds have been measured in order to investigate the fragmentation of the 1-heptyl iodide molecular ion. A mechanism is proposed for each reaction leading to the ions containing the iodine atom. The loss of olefin from the heptyl ion derived from the 1-heptyl iodide proceeds via extensive rearrangement of the linear ion. A non-linear intermediate structure obtained via protonated substituted cyclopropane is suggested to explain the major fragmentation reactions of the heptyl ion.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210121211
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  • 6
    Electronic Resource
    Electronic Resource
    Mass spectrometric decomposition processes of 2-methyl-1-hexene (1980)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 15 (1980), S. 440-444 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Unimolecular decompositions of 2-methyl-1-hexene and several labelled analogues were studied following 70 eV electron impact (normal and metastable spectra) and field ionization (field ionization kinetic measurements). Molecules labelled with 13C in the 1-position and the methyl position were found to behave essentially identically. This is attributed to rapid transfer of a hydrogen atom mainly from C-5 to C-1 (γ-hydrogen shift). Loss of ethene, propene or propenyl do not involve loss of the methyl carbon or C-1. All three reactions are better than 90% specific in this respect under all conditions studied. At shorter times, C3H6 loss is the dominant reaction, while at longer times C2H6 loss accounts for 〉90% of the ion current. It is proposed that at least two distinct pathways for C2H4 loss operate in linear 1-alkenes, one of which (loss of carbons 1 and 2) is blocked by a 2-methyl substituent. The [C6H11]+· and [C5H10]+· ions formed from 13C labelled 2-methyl-1-hexenes fragment in an essentially statistical fashion.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210150903
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  • 7
    Electronic Resource
    Electronic Resource
    Ionization energy of [NO2]+ by charge stripping mass spectrometry of nitromethane (1984)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 19 (1984), S. 202-202 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210190416
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  • 8
    Electronic Resource
    Electronic Resource
    Further examples of skeletal rearrangements of the Wagner-Meerwein type in chemical ionization mass spectrometry: The case of [C6H9]+ ions (1983)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 18 (1983), S. 215-218 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The [C6H9]+ ions produced either via unimolecular H2O loss from 13 [C6H11O]+ precursors or direct protonation of 1,3- and 1,4-cyclohexadiene have identical collisional activation mass spectra. The kinetic energy release data for the process [C6H11O]+→[C6H9]++H2O are also very similar (on average T0.5=24 meV) irrespective of the constitution of the precursor. From the proton affinities of 1,3-cyclohexadiene (PA=837.2 kJ mol-1) using ion cyclotron resonance mass spectrometry the heat of formation of the [C6H9]+ ion is determined to 804.6 kJ mol-1. This value taken together with the results of molecular orbital calculations (MNDO) and the structure indicative losses of CH3. and C2H4 upon collisional activation suggest that the [C6H9]+ ion has the structure of the 1-methylcyclopentenylium ion f and not that of the slightly less stable cyclohexenylium ion g. The generator of an easily interconverting system of isomeric [C6H9]+ ions is unlikely to be due to the high barrier separating the various isomers.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210180508
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  • 9
    Electronic Resource
    Electronic Resource
    Distinction between 17-epimeric hydroxy steroids of the 3,17-dioxygenated androstane series by chemical ionization (1985)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 20 (1985), S. 525-529 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The distinction between 17-epimeric 3,17-dioxygenated hydroxyandrostanes has been made by comparison of both their methane or ammonia positive and OH- negative chemical ionization (CI) mass spectra. In the methane or ammonia positive CI, the 17α-configuration in the eight stereoisomeric 5ξ-androstane-3ξ,17ξ-diols can be determined by the relative abundances of the ion [MH—2 H2O]+. In the ammonia CI spectra, the ion [M+NH4—H2O]+ possesses only a low abundance, but a comparison of the relative rates of the loss of water v. the loss of ammonia from [M.NH4]+ in the second field-free region allows a clear distinction to be made between the 17α- and 17β-series. In the OH- negative CI mass spectra, the 5ξ-androstane-3-one-17ξ-ols produce an intense ion [M—H—H2O]- in the 17α-series only.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210200808
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  • 10
    Electronic Resource
    Electronic Resource
    Structure and fragmentation of [C3H7O]+ ions formed by chemical ionization (1983)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 18 (1983), S. 517-524 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The unimolecular metastable and collision-induced fragmentation reactions of [C3H7O]+ ions produced by gas-phase protonation of acetone, propanal, propylene oxide, oxetan and allyl alcohol have been studied. The CID studies show that protonation of acetone and allyl alcohol yield different stable ions with distinct structures while protonation of propanal or propylene oxide yield [C3H7O]+ ions of the same structure. Protonated oxetan rearranges less readily to give the same structure(s) as protonated propanal and propylene oxide. The [C3H7O]+ ions fragmenting as metastable ions after formation by CI have a higher internal energy than the same ions fragmenting after formation by EI. Deuteronation of the C3H6O isomers using CD4 reagent gas shows that loss of C2H3D proceeds by a different mechanism than loss of C2H4. The results are discussed in terms of potential energy profile for the [C3H7O]+· system proposed earlier.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210181205
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