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  • Optics  (106)
  • Inorganic Chemistry  (46)
  • Astrophysics  (19)
  • Space Sciences (General)  (15)
  • 1
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    HabEx Telescope WFE Stability Specification Derived from Coronagraph Starlight Leakage (2018)
    In:  CASI
    Details
    Publication Date: 2019-09-26
    Description: HabEx is a space-based 4-meter diameter telescope with ultraviolet (UV), optical, and near-infrared (near-IR) imaging and spectroscopy capabilities. Three driving science goals during its five-year primary mission: 1. To seek out nearby worlds and explore their habitability.; 2. To map out nearby planetary systems and understand the diversity of the worlds they contain.; 3. To carry out observations that open up new windows on the universe from the UV through near-IR.
    Keywords: Space Sciences (General)
    Type: MSFC-E-DAA-TN60372 , MSFC-E-DAA-TN59966 , MSFC-E-DAA-TN72296 , SPIE Optics and Photonics; Aug 19, 2018 - Aug 23, 2018; San Diego, CA; United States|European Planetary Science Congress and Division for Planetary Science (EPSC-DPS) Meeting 2019; Sep 15, 2019 - Sep 20, 2019; Geneva; Switzerland
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    NASA TECHNICAL REPORTS
  • 2
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    Preliminary Analysis of Effect of Random Segment Errors on Coronagraph Performance (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Are we alone in the Universe is probably the most compelling science question of our generation. To answer it requires a large aperture telescope with extreme wavefront stability. To image and characterize Earth-like planets requires the ability to block 10(exp 10) of the host stars light with a 10(exp -11) stability. For an internal coronagraph, this requires correcting wavefront errors and keeping that correction stable to a few picometers rms for the duration of the science observation. This requirement places severe specifications upon the performance of the observatory, telescope and primary mirror. A key task of the AMTD project (initiated in FY12) is to define telescope level specifications traceable to science requirements and flow those specifications to the primary mirror. From a systems perspective, probably the most important question is: What is the telescope wavefront stability specification? Previously, we suggested this specification should be 10 picometers per 10 minutes; considered issues of how this specification relates to architecture, i.e. monolithic or segmented primary mirror; and asked whether it was better to have few or many segmented. This paper reviews the 10 picometers per 10 minutes specification; provides analysis related to the application of this specification to segmented apertures; and suggests that a 3 or 4 ring segmented aperture is more sensitive to segment rigid body motion that an aperture with fewer or more segments.
    Keywords: Optics
    Type: MSFC-E-DAA-TN25818-2 , Techniques and Instrumentation for Detection of Exoplanets Conference; Aug 09, 2015 - Aug 13, 2015; San Diego, CA; United States
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    NASA TECHNICAL REPORTS
  • 3
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    Incorporating Skew into RMS Surface Roughness Probability Distribution (2013)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The standard treatment of RMS surface roughness data is the application of a Gaussian probability distribution. This handling of surface roughness ignores the skew present in the surface and overestimates the most probable RMS of the surface, the mode. Using experimental data we confirm the Gaussian distribution overestimates the mode and application of an asymmetric distribution provides a better fit. Implementing the proposed asymmetric distribution into the optical manufacturing process would reduce the polishing time required to meet surface roughness specifications.
    Keywords: Optics
    Type: M13-2530 , SPIE Conference on Optical Manufacturing and Testing; Aug 25, 2013 - Aug 29, 2013; San Diego, CA
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    NASA TECHNICAL REPORTS
  • 4
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    Contrast Leakage as function of Telescope Motion (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Optics
    Type: MSFC-E-DAA-TN36977 , Mirror Technology/SBIR/STTR Workshop; Nov 01, 2016 - Nov 03, 2016; Greenbelt, MD; United States
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    NASA TECHNICAL REPORTS
  • 5
    Electronic Resource
    Electronic Resource
    Über Aromatenkomplexe von Metallen, XXXVII. Di-benzol-wolfram(0) (1960)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 93 (1960), S. 2065-2074 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Umsetzung des Systems WCl6/AlCl3/Al/C6H6 im Bombenrohr und alkalisch hydrolytische Aufarbeitung bei tiefen Temperaturen wurde in organischen Medien lösliches, grünes, unter starken Verlusten bei 60° i. Hochvak. sublimierbares Di-benzol-wolfram(0), W(C6H6)2, in geringer Ausbeute erhalten. Der diamagnetische, dipollose Durchdringungskomplex weist Doppelkegelstruktur auf und läßt sich mit J2 zu orangegelbem, paramagnetischem [W(C6H6)2]⊕-Kation umsetzen. Mo(C6H6)2, für welches eine verbesserte Darstellung angegeben wird, ergibt ganz entsprechendes [Mo(C6H6)2]⊕. Beide Kationen disproportionieren in alkalischem Medium nach: .
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19600930925
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  • 6
    Electronic Resource
    Electronic Resource
    Über die photochemische Reaktion von FCONSF2 mit OF2 und F2 (1977)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 2398-2400 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19771100639
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  • 7
    Electronic Resource
    Electronic Resource
    Spektroskopische Untersuchungen an Komplexverbindungen, IX. IR-Intensitäten von CO- und NO-Valenzschwingungen und Bindungswinkel in Metallcarbonylen und -nitrosylen (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 3721-3727 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus dem Verhältnis der Intensitäten der IR-aktiven CO- und NO-Valenzschwingungen läßt sich der Bindungswinkel zwischen äquivalenten CO- und NO-Gruppen ermitteln. Für eine Reihe von Metallcarbonyl- und -nitrosyl-Verbindungen stimmen die nach dieser Methode erhaltenen Winkel gut mit den erwarteten bzw. aus Röntgenstrukturuntersuchungen bekannten Werten überein.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660991202
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  • 8
    Electronic Resource
    Electronic Resource
    2,2-Disubstituierte 1,3-Dithiane aus β-Dicarbonylverbindungen (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 800-805 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2,2-Disubstituted 1,3-Dithianes from β-Dicarbonyl Compounds1,3-Dicarbonyl compounds 2 can be condensed with 1,3-propanedithiol (1) to yield 2,2-disubstituted 1,3-dithianes 3 which are remarkably stable in contrast to analogous open-chain thioacetals 6. Compounds with alkoxycarbonyl functions are easily hydrolysed to the corresponding carboxylic acids 11 which by further esterification with alkanols 12 yield estermodified 1,3-dithianes 3. All new compounds are characterized by 13C NMR spectroscopy.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130238
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  • 9
    Electronic Resource
    Electronic Resource
    1,3-Dithienium- und 1,3-Dithioleniumsalze, II. Synthese monocyclothioacetalisierter 1,3-Diketone aus Silylenolethern (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 1798-1808 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,3-Dithienium- and 1,3-Dithiolenium Salts, II. Synthesis of Monocyclothioacetalized 1,3-Diketones from Silyl Enol EthersThe 1,3-dithienium and 1,3-dithiolenium salts 3, available from the dithiols 1 or the cyclic thioacetals 4 (n = 2, 3) by reaction with the acyl chlorides 2, trityl tetrafluoroborate (5), and sulfuryl chloride (7), react in good yields with the silyl enol ethers 10 to give the new monocyclothioacetalized 1,3-Diketones 11. The synthetic of 11 as partially protected 1,3-Diketones is demonstrated exemplarily by dethioacetalization to the 1,3-dicarbonyl compounds 13.
    Notes: Die aus den Dithiolen 1 oder den cyclischen Thioacetalen 4 (n = 2, 3) durch Umsetzung mit den Acylchloriden 2, Trityl-tetrafluoroborat (5) und Sulfurylchlorid (7) erhältlichen 1,3-Dithienium-bzw. 1,3-Dithioleniumsalze 3 reagieren in guten Ausbeuten mit den Silylenolethern 10 zu den neuen monocyclothioacetalisierten 1,3-Diketonen 11. Das synthetische Potential von 11 als partiell geschützten 1,3-Diketonen wird exemplarisch durch Dethioacetalisierung zu den 1,3-Dicarbonylverbindungen 13 demonstriert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180507
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  • 10
    Electronic Resource
    Electronic Resource
    1,3-Dithienium- und 1,3-Dithioleniumsalze, VI N,N-Disubstituierte 4-Aminobenzophenone aus 1,3-Dithian- bzw. 1,3-Dithiolan-2-ylium-tetrafluoroboraten (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 135-139 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The 1,3-dithienium- and 1,3-dithiolenium tetrafluoroborates 3 (n=3, 2), respectively, react in good yields with the N,N-dialkylarylamines 4 to give the 2,2-disubstituted cyclic dithio acetals 5, which can be converted after dethioacetalization with HgCl2/HgO into the ketones 7.
    Notes: Die 1,3-Dithienium- bzw. 1,3-Dithiolenium-tetrafluoroborate 3 (n=3, 2) reagieren in guten Ausbeuten mit den N,N-Dialkylarylaminen 4 zu den 2,2-disubstituierten cyclischen Dithioacetalen 5, die sich nach Dethioacetalisierung mit HgCl2/HgO in die Ketone 7 überführen lassen.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200204
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