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  • 1
    Electronic Resource
    Electronic Resource
    Enrichment of carbon-14 by selective laser photolysis of formaldehyde (1980)
    Springer
    Applied physics 23 (1980), S. 25-32 
    Details
    ISSN: 1432-0630
    Keywords: 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Using a frequency-doubled dye laser, simultaneous high-resolution spectra of14CH2O and12CH2O between 290 and 345 nm were measured. About 30 lines with spectral selectivities for14C≳50 were found. Photolyses on one such line at 326.94 nm of a dilute mixture of14CH2O in natural CH2O gave one-step enrichment factors of up to 150, with μg yields of enriched product. Since a factor of 150 in14C concentration corresponds to ∼7.2 half lives or 41,000 years, laser enrichment of archaeological samples, especially when combined with direct detection methods of14C abundance measurement, can greatly improve the range of radiocarbon dating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899566
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of RCA cleaning on the surface chemistry of glass and polysilicon films as studied by ToF-SIMS and XPS (1998)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 26 (1998), S. 270-277 
    Details
    ISSN: 0142-2421
    Keywords: RCA clean ; glass ; surface chemistry ; polysilicon ; thin film transistor ; ToF-SIMS ; XPS ; x-ray photoelectron spectroscopy ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The surface chemistry of an alkaline-earth boroaluminosilicate glass is changed by contact with chemical solutions. The present study shows that RCA cleaning creates a silica-rich surface on the glass. This altered surface can be removed by hydrofluoric acid etching. During the RCA cleaning process, glass components can be transferred to a polysilicon film placed in the same alkaline solution. The acidic solution in turn removes most of the contamination from the polysilicon. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 3
    Electronic Resource
    Electronic Resource
    HCO radical kinetics: Conjunction of laser photolysis and intracavity dye laser spectroscopy (1978)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 10 (1978), S. 427-431 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: HCO radical at a concentration of about 1014 cm-3 is produced by monochromatic laser photolysis of H2CO with a 0.6 mJ frequency-doubled, flashlamp-pumped dye laser pulse. Intracavity dye laser spectroscopy quantitatively monitors HCO absorbance near 614 nm as a function of delay time between photolysis and probing pulses. Rate constants for HCO + O2 and HCO + NO are found to be 4.0 ± 0.8 × 10-12 and 1.45 ± 0.2 × 10-11 cm3 molecule-1 sec-1.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550100502
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  • 4
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    Unknown
    Environmental relationships to the chemistry of thermal waters (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Analyzing nitrogen and carbon content of rocks from volcanic and hot spring areas of Surtsey and Iceland
    Keywords: GEOPHYSICS
    Type: NASA. AMES RES. CENTER BOSTON COLL. ENVIRON. CENTER SUMMER INST. ON SURTSEY AND ICELAND FEB. 1971; P 80-83
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Catalog of meteorites in the collections of Arizona State University, including the Nininger Meteorite Collection (1964)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Catalog of meteorites in Arizona State University collection
    Keywords: GEOPHYSICS
    Type: NASA-CR-68989
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Compounds of the organogenic elements in Apollo 11 and 12 lunar samples - A review. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Investigations of low molecular weight compounds of the organogenic elements on lunar samples are reviewed. The three general techniques of vacuum pyrolysis, acid hydrolysis, and crushing have been employed by most investigators. Vacuum pyrolysis of lunar fines produce a variety of gaseous species which are either: (1) indigenous, (2) solar wind products and/or (3) chemical reaction products of mineral phases found in the lunar samples. Acid hydrolysis of lunar fines using deuterium-labeled acids yields evidence for indigenous methane and ethane. Methane and ethane found in the lunar fines are largely derived from the solar wind with only trace amounts indigenous to the samples. Crushing experiments with lunar fines and breccias produce methane, ethane, hydrogen, nitrogen, hydrogen sulfide and the rare gases.
    Keywords: BIOSCIENCES
    Format: text
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    NASA TECHNICAL REPORTS
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