Mass spectrometry samples

Herron, J. T., and R. E. Huie. Application of beam sampling mass spectrometry to the kinetics of ozone reactions. Int. J. Mass Spectrometry Ion Phys. 16 125-136, 1975. 

Fletcher AJ, Benham MJ, Thomas KM et al (2002) Multicomponent vapor sorption on active carbon by combined microgravimetry and dynamic sampling mass spectrometry. J Phys Chem B 106 7474-7482... 

D. L. Styris and D. A. Redfield, Mechanisms of Graphite Furnace Atomization of Aluminum by Molecular Beam Sampling Mass Spectrometry, Anal. Chem. 1987,59, 2891. 

R.A. Beyer, Molecular Beam Sampling Mass Spectrometry of High Heating Rate Pyrolysis. Description of Data Acquisition System and Pyrolysis of HMX in a Polyurethane Binder ,... 

The present work involves measurement of k in a 0.1 atmosphere, stoichiometric CH -Air flame. All experiments were conducted using 3 inch diameter water-cooled sintered copper burners. Data obtained in our study include (a) temperature profiles obtained by coated miniature thermocouples calibrated by sodium line reversal, (b) NO and composition profiles obtained using molecular beam sampling mass spectrometry and microprobe sampling with chemiluminescent analysis and (c) OH profiles obtained by absorption spectroscopy using an OH resonance lamp. Several flame studies (4) have demonstrated the applicability of partial equilibrium in the post reaction zone of low pressure flames and therefore the (OH) profile can be used to obtain the (0) profile with high accuracy. 

Gardner WP, Shaffer RE, Girard JE, Callahan JH, Application of quantitative chemometric analysis techniques to direct sampling mass spectrometry, Analytical Chemistry, 2001, 73, 596-605. 

Mass spectrometry is becoming the most common detector for the analysis of VOCs in soil samples, particularly as bench top instruments have increased in performance and decreased in price. Very often, the nature of the contaminants present is unknown and MS is used to identify individual compounds in the sample. Mass spectrometry may be used either in full scan mode or selected ion monitoring, depending on the nature of the compounds to be analysed and whether or not identification and quantitation are required. The use of selected... 

Spectroscopic techniques are popular as a means of detection on chips. Examples include the determination of flavins and DNA by fluorescence. Spectrophotometric techniques are often used for biological samples . Mass spectrometry has also been used. Benetton et al. coupled electrospray ionisation MS to a chip while Sillon et al. developed a low cost mass spectrometer which incorporated the ionisation chamber, filter and detector on the chip. A fibre optic coupler has been developed as a detector. The dual optical fibre configuration (one transmitting, one receiving, (Eigure 10.5)) in the chip forms the microchannel as well as the detector itself and measures refractive index changes but can also be used to measure absorbance . 

Xu, Y, Bruening, M. L., and Watson, J. T., Non-specific, on-probe cleanup methods for MALDI-MS samples. Mass Spectrometry Review, 22, 429 40, 2003. 

Nitrogen. The reaction of PH3 in Ar with atomic N is accompanied by a pale green luminescence. The bands observed in the range 6000 to 2300 cm- were assigned to PH, PH2, PN, NJ, and NH. The final product is a solid [64]. The reaction of PH3 in the carrier gas He with N( S) atoms was found to be very slow. A rate constant of k 4.0 x10" cm molecule" s" at ambient temperature was determined in a flow tube by molecular-beam sampling mass spectrometry. This rate constant is compatible with the slight endothermicity (ArH298 = 4 kJ/mol) of the reaction PH3 + N- -PH2 + NH [36]. 

Owen, A.W., McAulay, E.A., Nordon, A., Littlejohn, D., Lynch, T.P., Lancaster, J.S., Wright, R.G. (2014) Monitoring of an Esterification Reaction by On-line Direct Liquid Sampling Mass Spectrometry and In-line Mid Infrared Spectrometry with an Attenuated Total Reflectance Probe. Anal. Chim. Acta 849 12-18. 

Volny, M Rolfs, J Hakimi, B Frycak, R, Schneider, T, Liu, D., Yen, G., Chiu, D. T Turebek, F. (2014) Nanoliter Segmented-flow Sampling Mass Spectrometry with Online Compartmentalization. Anal. Chem. 86 3647-3652. 

Techniques to Direct Sampling Mass Spectrometry," Analytical Chemistry 73 (2001), 596-605. Using Table 1 as the input, perform a principal components analysis. Can the dimensionality of these data be reduced with this technique ... 

Seery and Zabielski (1980) utilized low-pressureCH4-air flames to infer k. Their data included NO and N2 composition profiles by molecular beam sampling mass spectrometry and microprobe sampling with chemiluminescent analysis, temperature profiles by thermocouples, and OH profiles by resonance absorption. Partial equilibrium was assumed in order to infer O-atom concentrations in the postflame region. The simplified expression (4) was used to infer at several flame locations. Although the scatter in the ki data show an average deviation of 28% about the mean, the mean agrees within 4% with the best-fit expression reported by Monat et al (1979). 

---