Evidence for Predissociation ofN2intoN(D2)+N(D2)from New High-Resolution Vacuum-Ultraviolet Emission Bands

1984 ◽  
Vol 53 (2) ◽  
pp. 159-162 ◽  
Author(s):  
Jean-Yves Roncin ◽  
Françoise Launay ◽  
Michel Larzilliere
Keyword(s):  
High Resolution ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Emission

Evidence for Predissociation ofN2intoN(D2)+N(D2)from New High-Resolution Vacuum-Ultraviolet Emission Bands

1984 ◽  
Vol 53 (18) ◽  
pp. 1777-1777
Author(s):  
Jean-Yves Roncin ◽  
Françoise Launay ◽  
Michel Larzilliere
Keyword(s):  
High Resolution ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Emission

High resolution vacuum ultraviolet emission spectrum of D2: The B′Σu+1→XΣg+1 band system

2007 ◽  
Vol 127 (5) ◽  
pp. 054307 ◽  
Author(s):  
Mourad Roudjane ◽  
W.-Ü Lydia Tchang-Brillet ◽  
Françoise Launay
Keyword(s):  
High Resolution ◽  
Emission Spectrum ◽  
Vacuum Ultraviolet ◽  
Band System ◽  
Ultraviolet Emission

High-resolution far ultraviolet emission spectra of electron-excited molecular deuterium

1999 ◽  
Vol 32 (15) ◽  
pp. 3813-3838 ◽  
Author(s):  
H Abgrall ◽  
E Roueff ◽  
Xianming Liu ◽  
D E Shemansky ◽  
G K James
Keyword(s):  
High Resolution ◽  
Emission Spectra ◽  
Ultraviolet Emission ◽  
Far Ultraviolet

Performance of the vacuum ultraviolet high-resolution and high-flux beamline for chemical dynamics studies at the Advanced Light Source

1997 ◽  
Vol 68 (5) ◽  
pp. 1945-1951 ◽  
Author(s):  
P. A. Heimann ◽  
M. Koike ◽  
C. W. Hsu ◽  
D. Blank ◽  
X. M. Yang ◽  
...  
Keyword(s):  
High Resolution ◽  
Light Source ◽  
Vacuum Ultraviolet ◽  
High Flux ◽  
Chemical Dynamics ◽  
Advanced Light Source

Diagnostics of N2dissociation in RF plasmas by vacuum ultraviolet emission and absorption spectroscopy

2008 ◽  
Vol 17 (2) ◽  
pp. 024018 ◽  
Author(s):  
Takeshi Kitajima ◽  
Toshiki Nakano ◽  
Seiji Samukawa ◽  
Toshiaki Makabe
Keyword(s):  
Absorption Spectroscopy ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Emission ◽  
Rf Plasmas

scholarly journals Elemental ratio measurements of organic compounds using aerosol mass spectrometry: characterization, improved calibration, and implications

2015 ◽  
Vol 15 (1) ◽  
pp. 253-272 ◽  
Author(s):  
M. R. Canagaratna ◽  
J. L. Jimenez ◽  
J. H. Kroll ◽  
Q. Chen ◽  
S. H. Kessler ◽  
...  
Keyword(s):  
High Resolution ◽  
Vacuum Ultraviolet ◽  
Laboratory Data ◽  
Detailed Examination ◽  
Relative Difference ◽  
Data Set ◽  
Elemental Ratios ◽  
Standard Data ◽  
Aerosol Mass ◽  
Relative Errors

Abstract. Elemental compositions of organic aerosol (OA) particles provide useful constraints on OA sources, chemical evolution, and effects. The Aerodyne high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) is widely used to measure OA elemental composition. This study evaluates AMS measurements of atomic oxygen-to-carbon (O : C), hydrogen-to-carbon (H : C), and organic mass-to-organic carbon (OM : OC) ratios, and of carbon oxidation state (OS C) for a vastly expanded laboratory data set of multifunctional oxidized OA standards. For the expanded standard data set, the method introduced by Aiken et al. (2008), which uses experimentally measured ion intensities at all ions to determine elemental ratios (referred to here as "Aiken-Explicit"), reproduces known O : C and H : C ratio values within 20% (average absolute value of relative errors) and 12%, respectively. The more commonly used method, which uses empirically estimated H2O+ and CO+ ion intensities to avoid gas phase air interferences at these ions (referred to here as "Aiken-Ambient"), reproduces O : C and H : C of multifunctional oxidized species within 28 and 14% of known values. The values from the latter method are systematically biased low, however, with larger biases observed for alcohols and simple diacids. A detailed examination of the H2O+, CO+, and CO2+ fragments in the high-resolution mass spectra of the standard compounds indicates that the Aiken-Ambient method underestimates the CO+ and especially H2O+ produced from many oxidized species. Combined AMS–vacuum ultraviolet (VUV) ionization measurements indicate that these ions are produced by dehydration and decarboxylation on the AMS vaporizer (usually operated at 600 °C). Thermal decomposition is observed to be efficient at vaporizer temperatures down to 200 °C. These results are used together to develop an "Improved-Ambient" elemental analysis method for AMS spectra measured in air. The Improved-Ambient method uses specific ion fragments as markers to correct for molecular functionality-dependent systematic biases and reproduces known O : C (H : C) ratios of individual oxidized standards within 28% (13%) of the known molecular values. The error in Improved-Ambient O : C (H : C) values is smaller for theoretical standard mixtures of the oxidized organic standards, which are more representative of the complex mix of species present in ambient OA. For ambient OA, the Improved-Ambient method produces O : C (H : C) values that are 27% (11%) larger than previously published Aiken-Ambient values; a corresponding increase of 9% is observed for OM : OC values. These results imply that ambient OA has a higher relative oxygen content than previously estimated. The OS C values calculated for ambient OA by the two methods agree well, however (average relative difference of 0.06 OS C units). This indicates that OS C is a more robust metric of oxidation than O : C, likely since OS C is not affected by hydration or dehydration, either in the atmosphere or during analysis.

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