scholarly journals Characterization of open-cycle coal-fired MHD generators. Quarterly technical summary report No. 3, January 1--March 31, 1977. [Negative ion formation, electron/slag interaction, and alkali/slag interaction]

1977 ◽  
Author(s):  
C.E. Kolb ◽  
V. Yousefian ◽  
J. Wormhoudt ◽  
M. Martinez-Sanchez ◽  
J.L. Kerrebrock
Keyword(s):  
Negative Ion ◽  
Summary Report ◽  
Ion Formation ◽  
Open Cycle

scholarly journals Characterization of open-cycle coal-fired MHD generators. Quarterly technical summary report No. 2, October 1--December 31, 1976. [Negative ion formation, electron/slag interaction, and alkali/slag interaction]

1977 ◽  
Author(s):  
C.E. Kolb ◽  
V. Yousefian ◽  
J. Wormhoudt ◽  
M. Martinez-Sanchez ◽  
J.L. Kerrebrock
Keyword(s):  
Negative Ion ◽  
Summary Report ◽  
Ion Formation ◽  
Open Cycle

scholarly journals Characterization of open-cycle coal-fired MHD generators. Quarterly technical summary report No. 6, October 1--December 31, 1977. [PACKAGE code]

1978 ◽  
Author(s):  
C.E. Kolb ◽  
V. Yousefian ◽  
J. Wormhoudt ◽  
R. Haimes ◽  
M. Martinez-Sanchez ◽  
...  
Keyword(s):  
Summary Report ◽  
Open Cycle

Theoretical Studies of Kinetic Mechanisms of Negative Ion Formation in Plasmas.

1983 ◽  
Author(s):  
H. Harvey Michels ◽  
Robert H. Hobbs
Keyword(s):  
Negative Ion ◽  
Theoretical Studies ◽  
Ion Formation ◽  
Kinetic Mechanisms

Theoretical Studies of Kinetic Mechanisms of Negative Ion Formation in Plasmas.

1984 ◽  
Author(s):  
H. H. Michels ◽  
R. H. Hobbs
Keyword(s):  
Negative Ion ◽  
Theoretical Studies ◽  
Ion Formation ◽  
Kinetic Mechanisms

scholarly journals Chemical Evaluation of Eumelanin Maturation by ToF-SIMS and Alkaline Peroxide Oxidation HPLC Analysis

2020 ◽  
Vol 22 (1) ◽  
pp. 161
Author(s):  
Martin Jarenmark ◽  
Peter Sjövall ◽  
Shosuke Ito ◽  
Kazumasa Wakamatsu ◽  
Johan Lindgren
Keyword(s):  
Molecular Structure ◽  
Secondary Ion Mass Spectrometry ◽  
Chemical Characterization ◽  
Experimental Treatment ◽  
Negative Ion ◽  
Pressure Treatment ◽  
Peroxide Oxidation ◽  
Specific Chemical ◽  
Tof Sims

Residual melanins have been detected in multimillion-year-old animal body fossils; however, confident identification and characterization of these natural pigments remain challenging due to loss of chemical signatures during diagenesis. Here, we simulate this post-burial process through artificial maturation experiments using three synthetic and one natural eumelanin exposed to mild (100 °C/100 bar) and harsh (250 °C/200 bar) environmental conditions, followed by chemical analysis employing alkaline hydrogen peroxide oxidation (AHPO) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). Our results show that AHPO is sensitive to changes in the melanin molecular structure already during mild heat and pressure treatment (resulting, e.g., in increased C-C cross-linking), whereas harsh maturation leads to extensive loss of eumelanin-specific chemical markers. In contrast, negative-ion ToF-SIMS spectra are considerably less affected by mild maturation conditions, and eumelanin-specific features remain even after harsh treatment. Detailed analysis of ToF-SIMS spectra acquired prior to experimental treatment revealed significant differences between the investigated eumelanins. However, systematic spectral changes upon maturation reduced these dissimilarities, indicating that intense heat and pressure treatment leads to the formation of a common, partially degraded, eumelanin molecular structure. Our findings elucidate the complementary nature of AHPO and ToF-SIMS during chemical characterization of eumelanin traces in fossilized organismal remains.

Temporary negative ion formation in interactions of low-energy inert gas ions (He+, Ne+) with Cs-adsorbed Cu(111) surfaces

1995 ◽  
Vol 341 (1-2) ◽  
pp. 19-28 ◽  
Author(s):  
Q.B. Lu ◽  
D.J. O'Connor ◽  
B.V. King ◽  
Y.G. Shen ◽  
R.J. MacDonald
Keyword(s):  
Low Energy ◽  
Inert Gas ◽  
Negative Ion ◽  
Ion Formation

Temperature Dependence of the Onset for Negative-Ion Formation in CO2

1969 ◽  
Vol 22 (2) ◽  
pp. 47-50 ◽  
Author(s):  
G. J. Schulz ◽  
D. Spence
Keyword(s):  
Temperature Dependence ◽  
Negative Ion ◽  
Ion Formation

Dynamics of temporary negative ion formation in He+ ion neutralization at an Al(100)/K surface

2004 ◽  
Vol 555 (1-3) ◽  
pp. L133-L137 ◽  
Author(s):  
J.C. Lancaster ◽  
F.J. Kontur ◽  
G.K. Walters ◽  
F.B. Dunning
Keyword(s):  
Negative Ion ◽  
Ion Formation
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