Quadrupole mass spectroscopy

An extensive and detailed coverage of the MS of expls in general has been documented (Ref 163). Volatile constituents of Comp A-3, Comp B, pressed TNT and cast TNT were surveyed with a residual gas analyzer MS (Ref 40). The mass spectra of all possible TNT (except for 3,4,5-TNT) and DNT isomers in the vapor phase were obtained as a function of ionizing voltage (Refs 65 84). The use of membrane inlet systems for the separation of TNT vapor in trace vapor detection is described and an analysis of the membrane inlet system for quadrupole mass spectroscopy is presented (Refs 95 113). Estimations of the vapor pressure of TNT were made mass spectrometrically in the range of 50—... 

Intense EE and PIE have been observed during fracture as well. In recent work, we have succeeded in determining the predominate ionic species created during the fracture of UV grade fused silica. (Langford, S. C. Dickinson, J. T. Jensen, L. C. J. Vac. Sci. Technol. A. in press.). Both time-of-flight and quadrupole mass spectroscopy indicate the presence of ions of mass 16,28,44, and 76, which we... 

The S3N3 radical has been characterized by photoelectron and quadrupole mass spectroscopy as the major product from the vaporization of (SN)j . In the condensed state, it reforms the polymer and other colored materials. Ab initio Cl calculations indicate a planar geometry with close to D h syimnetry for the S3N3 radical. 

Figure 1. Thermal desorption temperature Td as a function of the Pauling electronegativity [20]. Closed and open circles indicate the series of single-cation borohydrides M(BH4) (M = Li, Na, Mg, Zn, Sc, and Zr n = 1-4) and double-cation ones ZrLi .4(BH4) (n = 4 (Zr(BH4)4), 5 and 6), examined by gas chromatography (GC) and quadrupole mass spectroscopy (QMS), respectively. There is a difference between Td of LiBH4/ZrBH4 determined using GC (approximately 800 K) and that determined using QMS (approximately 740 K), owing to a longer distance between the detector and sample, and also to a lower gas flow rate, in GC.

Figure 2. Thermal desorption reactions of ZrLi .4(BH4) and LiBH4 for reference, examined by quadrupole mass spectroscopy (QMS) [20]. All the reactions originate only from ZrLi .4(BH4) , because coexisting LiCl decomposes at temperature higher than 878 K. The desorption temperature Ti, defined as the peak temperature of the main desorption reaction, is summarized in Fig. 1 with open circles.

Figure 2.26 Schematic of the SoLiAS used for SRPES at BESSY level 1 is the conditioning level with the electrochemical vessel (EC see Figure 2.27) attached, facilities for etching, and a buffer chamber (BC) for outgassing of samples that underwent wet treatments after transfer to the manipulator M, measurement levels 2 and 3 can be assessed at level 2, UPS LEED and quadrupole mass spectroscopy (QMS)...

Adams, R.P. (2007) Identification of Essential Oils Components by Gas Chromatography/ quadrupole Mass Spectroscopy. Allured Pub. Corp. 

Zheng B, Goldberg C, Eisenbraun ET, Liu J, Kaloyeros AE, Toscano PJ, Murarka SR Loan JF, Sullivan J. In situ quadrupole mass spectroscopy studies of water and solvent coordination to Copper(II) P- Diketonate precursors implications for the chemical vapor deposition of Copper. MaterChem Phys. 1995 41 173-81. 

Dawson PH and Whetten NR (1969) Radiofrequency quadrupole mass spectroscopy. Electronics and Electron Physics 27 58-158. 

---