Oxidation ot sultur compounds. I. The photolysis of CH3SH and (CH3S)2 in the presence of NO

1984 ◽  
Vol 62 (1) ◽  
pp. 162-170 ◽  
Author(s):  
R. Jeffrey Balla ◽  
Julian Heicklen
Keyword(s):  
Mass Spectrometer ◽  
Quadrupole Mass Spectrometer ◽  
Chain Process ◽  
Quadrupole Mass ◽  
Product Analysis ◽  
Hydrogen Atoms ◽  
A Chain

Both CH3SH and (CH3S)2, as well as their mixtures, were photolyzed in the presence of NO at 23 ± 1 °C. The photolyses were carried out in a 631 mL quartz vessel with a pinhole bleed to a quadrupole mass spectrometer for continual analysis of products. After the termination of exposure, further product analysis was made by gas chromatography.The identified products of the reaction were CH3SNO, (CH3S)2, H2, and N2. Hydrogen atoms, formed from the photolysis of CH3SH, reacted with both NO and CH3SH:[Formula: see text]with k5/k4 = 626 ± 42 Torr for NO as a chaperone. The CH3S radical adds to NO[Formula: see text]with k−2a/k2b = 83 ± 52 Torr. As the CH3SNO accumulates, CH3S also reacts with CH3SNO[Formula: see text]with [Formula: see text]. At high NO pressures a chain process occurs which is attributed to:[Formula: see text]where ξ is probably 4.0. Termination is most easily represented by[Formula: see text]with k8/k7 = 85.0 ± 7.8 Torr

Development of Dual-Source (Glow Discharge/Laser Ablation & Ionization) Quadrupole Mass Spectrometer

2013 ◽  
Vol 40 (7) ◽  
pp. 983-988
Author(s):  
Ling-Feng LI ◽  
Wei-Feng LI ◽  
Xiao-Hua WANG ◽  
Wei HANG ◽  
Ben-Li HUANG
Keyword(s):  
Laser Ablation ◽  
Glow Discharge ◽  
Mass Spectrometer ◽  
Quadrupole Mass Spectrometer ◽  
Quadrupole Mass ◽  
Dual Source ◽  
Discharge Laser

276. Analyzer of a quadrupole mass spectrometer

Vacuum ◽  
1971 ◽  
Vol 21 (5) ◽  
pp. 191
Keyword(s):  
Mass Spectrometer ◽  
Quadrupole Mass Spectrometer ◽  
Quadrupole Mass

Development of an Automated Multi-Injection Shotgun Lipidomics Approach Using a Triple Quadrupole Mass Spectrometer

Lipids ◽  
2014 ◽  
Vol 49 (6) ◽  
pp. 609-619 ◽  
Author(s):  
John A. Bowden ◽  
Jackie T. Bangma ◽  
John R. Kucklick
Keyword(s):  
Mass Spectrometer ◽  
Quadrupole Mass Spectrometer ◽  
Triple Quadrupole ◽  
Quadrupole Mass ◽  
Triple Quadrupole Mass Spectrometer ◽  
Shotgun Lipidomics

The electron-stimulated desorption ions from the ionizer of a quadrupole mass spectrometer

Vacuum ◽  
2006 ◽  
Vol 81 (1) ◽  
pp. 66-70 ◽  
Author(s):  
N. Takahashi ◽  
Y. Tuzi ◽  
I. Arakawa
Keyword(s):  
Mass Spectrometer ◽  
Quadrupole Mass Spectrometer ◽  
Quadrupole Mass ◽  
Electron Stimulated Desorption

scholarly journals Multistage Fragmentation of Ion Trap Mass Spectrometry System and Pseudo-MS3of Triple Quadrupole Mass Spectrometry Characterize Certain (E)-3-(Dimethylamino)-1-arylprop-2-en-1-ones: A Comparative Study

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Ali S. Abdelhameed ◽  
Adnan A. Kadi ◽  
Hatem A. Abdel-Aziz ◽  
Rihab F. Angawi ◽  
Mohamed W. Attwa ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectrometer ◽  
Ion Trap ◽  
Quadrupole Mass Spectrometer ◽  
Ion Trap Mass Spectrometry ◽  
Triple Quadrupole ◽  
Quadrupole Mass ◽  
Triple Quadrupole Mass Spectrometer ◽  
Fragment Ions ◽  
Mass Spectrometry System

A new approach was recently introduced to improve the structure elucidation power of tandem mass spectrometry simulating the MS3of ion trap mass spectrometry system overcoming the different drawbacks of the latter. The fact that collision induced dissociation in the triple quadrupole mass spectrometer system provides richer fragment ions compared to those achieved in the ion trap mass spectrometer system utilizing resonance excitation. Moreover, extracting comprehensive spectra in the ion trap needs multistage fragmentation, whereas similar fragment ions may be acquired from one stage product ion scan using the triple quadrupole mass spectrometer. The new strategy was proven to enhance the qualitative performance of tandem mass spectrometry for structural elucidation of different chemical entities. In the current study we are endeavoring to prove our hypothesis of the efficiency of the new pseudo-MS3technique via its comparison with the MS3mode of ion trap mass spectrometry system. Ten pharmacologically and synthetically important (E)-3-(dimethylamino)-1-arylprop-2-en-1-ones (enaminones4a–j) were chosen as model compounds for this study. This strategy permitted rigorous identification of all fragment ions using triple quadrupole mass spectrometer with sufficient specificity. It can be used to elucidate structures of different unknown components. The data presented in this paper provide clear evidence that our new pseudo-MS3may simulate the MS3of ion trap spectrometry system.

Mass discrimination effects in a quadrupole mass spectrometer

1978 ◽  
Vol 50 (12) ◽  
pp. 1652-1654 ◽  
Author(s):  
Karl V. Wood ◽  
Andrew H. Grange ◽  
James W. Taylor
Keyword(s):  
Mass Spectrometer ◽  
Quadrupole Mass Spectrometer ◽  
Mass Discrimination ◽  
Quadrupole Mass

Sensitive helium leak detection in a deuterium atmosphere using a high-resolution quadrupole mass spectrometer

Vacuum ◽  
1996 ◽  
Vol 47 (6-8) ◽  
pp. 767-769 ◽  
Author(s):  
S Hiroki ◽  
T Abe ◽  
Y Murakami
Keyword(s):  
High Resolution ◽  
Mass Spectrometer ◽  
Leak Detection ◽  
Quadrupole Mass Spectrometer ◽  
Quadrupole Mass
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