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Journal articles on the topic 'Molecular beam mass spectrometry'

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Author: Grafiati

Published: 8 June 2024

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1

Grieser, Manfred, Viviane C. Schmidt, Klaus Blaum, Florian Grussie, Robert von Hahn, Ábel Kálosi, Holger Kreckel, et al. "Isochronous mass spectrometry in an electrostatic storage ring." Review of Scientific Instruments 93, no. 6 (June 1, 2022): 063302. http://dx.doi.org/10.1063/5.0090131.

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For sensitive studies of molecular ions in electrostatic storage rings, the exact knowledge of the isobaric composition of stored beams from a variety of ion sources is essential. Conventional mass-filtering techniques are often inefficient to resolve the beam components. Here, we report the first isochronous mass spectrometry in an electrostatic storage ring, which offers a high mass resolution of Δ m/ m < 1 × 10−5 even for heavy molecular species with m > 100 u and uncooled ion beams. Mass contaminations can be resolved and identified at relative fractions down to 0.02%.

2

KASPER, T., P. OSWALD, M. KAMPHUS, and K. KOHSEHOINGHAUS. "Ethanol flame structure investigated by molecular beam mass spectrometry." Combustion and Flame 150, no. 3 (August 2007): 220–31. http://dx.doi.org/10.1016/j.combustflame.2006.12.022.

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3

Fárník, Michal, and Jozef Lengyel. "Mass spectrometry of aerosol particle analogues in molecular beam experiments." Mass Spectrometry Reviews 37, no. 5 (November 27, 2017): 630–51. http://dx.doi.org/10.1002/mas.21554.

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4

Korobeinichev, Oleg P., Leonid V. Kuibida, Alexander A. Paletsky, and Andrey G. Shmakov. "Molecular-Beam Mass-Spectrometry to Ammonium Dinitramide Combustion Chemistry Studies." Journal of Propulsion and Power 14, no. 6 (November 1998): 991–1000. http://dx.doi.org/10.2514/2.5364.

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5

Aranda Gonzalvo, Y., T. D. Whitmore, J. A. Rees, D. L. Seymour, and E. Stoffels. "Atmospheric pressure plasma analysis by modulated molecular beam mass spectrometry." Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 24, no. 3 (May 2006): 550–53. http://dx.doi.org/10.1116/1.2194938.

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6

Dantus, M., M. H. M. Janssen, and A. H. Zewail. "Femtosecond probing of molecular dynamics by mass-spectrometry in a molecular beam." Chemical Physics Letters 181, no. 4 (June 1991): 281–87. http://dx.doi.org/10.1016/0009-2614(91)80071-5.

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7

Zavilopulo, A. N., and A. I. Dolgin. "Mass-spectrometry of cluster molecular beams." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 126, no. 1-4 (April 1997): 305–9. http://dx.doi.org/10.1016/s0168-583x(97)01104-x.

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8

Hsu, Wen L., Mark C. McMaster, Michael E. Coltrin, and David S. Dandy. "Molecular Beam Mass Spectrometry Studies of Chemical Vapor Deposition of Diamond." Japanese Journal of Applied Physics 33, Part 1, No. 4B (April 30, 1994): 2231–39. http://dx.doi.org/10.1143/jjap.33.2231.

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9

Balooch, M., D. R. Olander, W. J. Siekhaus, and D. E. Miller. "Reaction of chlorine and molybdenum by modulated molecular beam mass spectrometry." Surface Science Letters 249, no. 1-3 (June 1991): A270. http://dx.doi.org/10.1016/0167-2584(91)90149-l.

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10

Balooch, M., D. R. Olander, W. J. Siekhaus, and D. E. Miller. "Reaction of chlorine and molybdenum by modulated molecular beam mass spectrometry." Surface Science 249, no. 1-3 (June 1991): 322–34. http://dx.doi.org/10.1016/0039-6028(91)90856-n.

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11

Hsu, W. L., and D. M. Tung. "Application of molecular beam mass spectrometry to chemical vapor deposition studies." Review of Scientific Instruments 63, no. 9 (September 1992): 4138–48. http://dx.doi.org/10.1063/1.1143225.

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12

Tsao, J. Y., T. M. Brennan, and B. E. Hammons. "Reflection mass spectrometry of As incorporation during GaAs molecular beam epitaxy." Applied Physics Letters 53, no. 4 (July 25, 1988): 288–90. http://dx.doi.org/10.1063/1.99916.

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13

Butkovskaya, N. L., E. S. Vasil'ev, and I. I. Morozov. "Study of small benzene clusters by pulse molecular beam mass spectrometry." Russian Chemical Bulletin 45, no. 7 (July 1996): 1635–41. http://dx.doi.org/10.1007/bf01431800.

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14

Yase, Kiyoshi, Yuji Yoshida, Toshiyuki Uno, and Norimasa Okui. "Direct analysis of an organic molecular beam by quadrupole mass spectrometry." Journal of Crystal Growth 166, no. 1-4 (September 1996): 942–45. http://dx.doi.org/10.1016/0022-0248(95)00898-5.

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15

Karas, Michael. "Laser Microprobe Mass Spectrometry for Spatially Resolved Organic Analysis." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 2 (August 12, 1990): 306–7. http://dx.doi.org/10.1017/s0424820100135137.

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Within the last twenty years, lasers were used for sample ionization in mass spectrometry by coupling nearly any available type of laser to the different kinds of available mass analyzers. There is a broad area of applications of the so-called laser ionization/desorption mass spectrometry (LIMS, LDMS) in a large variety of fields, such as geology, mineralogy, material research, general chemistry and biochemistry ranging from determination of bulk elemental composition to molecular weight determination of biological macromolecules. By combining an UV-microscope with a short-pulse UV-laser (for sample observation and focused irradiation of selected sample areas within μm-resolution) and a time-of-flight mass spectrometer, the technique of laser microprobe mass spectrometry was established (LAMMA-, LIMAtechnique). Also laser microprobe mass spectrometry was applied in very different fields. Most of the work dealt with the determination of element distributions within biological samples, usually prepared as thin sections and examined with a transmission geometry, i.e. by perforating the compartment of sample to be analyzed with a high intensity laser beam.

16

Ruwe, Lena, Kai Moshammer, Nils Hansen, and Katharina Kohse-Höinghaus. "Influences of the molecular fuel structure on combustion reactions towards soot precursors in selected alkane and alkene flames." Physical Chemistry Chemical Physics 20, no. 16 (2018): 10780–95. http://dx.doi.org/10.1039/c7cp07743b.

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17

Kulchitsky, N. A. "Atomic and Molecular Beams Control in Molecular Beam Epitaxy." Nano- i Mikrosistemnaya Tehnika 23, no. 1 (February 24, 2021): 47–56. http://dx.doi.org/10.17587/nmst.23.47-56.

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Rapid development of molecular beam epitaxy (MBE) in recent decades has led to the emergence of a variety of technological installations, as well as electronic and optical diagnostics of growing layers, as well as atomic and molecular beams. Known methods for monitoring atomic and molecular beams in MBE installations-mass spectrometric and luminescent - involve bulky sensors, which can only be placed in special growth chambers. This paper describes a structurally simple and fairly universal method for determining the intensities of atomic and molecular beams, based on registering the amount of electron scattering at small angles that occur when a narrow electron beam interacts with the atoms of a vaporized substance. We consider the theoretical prerequisites for the diagnosis of an atomic beam by the phenomenon of scattering of fast electrons in it.

18

Uchimura, Tomohiro, Klaus Hafner, Ralf Zimmermann, and Totaro Imasaka. "Multiphoton Ionization Mass Spectrometry of Chlorophenols as Indicators for Dioxins." Applied Spectroscopy 57, no. 4 (April 2003): 461–65. http://dx.doi.org/10.1366/00037020360626014.

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Mono-, di- and trichlorophenols were measured using resonance-enhanced multiphoton ionization mass spectrometry (MPI-MS) combined with supersonic jet (SSJ) or effusive molecular beam (EMB) spectrometry. All mono- and dichlorophenols, except 2,6-dichlorophenol, provided sharp and structured MPI spectra for the S1←S0 transition. Selectivity and sensitivity were both enhanced when SSJ spectrometry was used, compared with EMB spectrometry, because of a narrower linewidth in the MPI spectrum, given by molecular cooling by supersonic jet expansion. The ionization efficiency decreased with increasing number of chlorine substituents for the chlorophenols, since they have shorter excited-state lifetimes and require three photons for ionization. Some of the chlorophenols, which are toxic themselves, have the potential for use as indicators for analysis of polychlorinated dibenzo- p-dioxin/dibenzofurans in flue gases emitted from an incinerator.

19

Loftus, Neil. "Gold standard: Mass spectrometry and chromatography." Biochemist 24, no. 1 (February 1, 2002): 25–27. http://dx.doi.org/10.1042/bio02401025.

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Mass spectrometry (MS) interfaced with liquid chromatography (LC) was once considered a technology that was reserved for rather specific applications that appeared to work in sequence with the phases of the moon. Early adventures with thermospray and particle beam interfaces proved to be of limited use, and it was not until atmospheric pressure ionization established itself that we could regard LC–MS as the analytical tool of choice for a considerable range of challenges. Indeed, advances in source design and increased ion transmission have presented a new generation of instruments that use hybrid technology such as quadrupole-time of flight (QToF), ToF–ToF and quadrupole ion-trap ToF, which provide even higher levels of confidence as a consequence of higher mass accuracy and enhanced structural information.

20

Khodakov, Mikhail, Aleksandr Zarvin, Valeriy Kaljada, and Nikolay Korobeishchikov. "Mass-Spectrometry of Supersonic Cluster Jets of Methane and Argon-Methane Mixtures." Siberian Journal of Physics 7, no. 3 (October 1, 2012): 84–95. http://dx.doi.org/10.54362/1818-7919-2012-7-3-84-95.

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We describe a new experimental facility LEMPUS-2, which provides experimental research in supersonic flows of gases and gas mixtures in the oil-free vacuum. Model experiments in a flow of pure argon in order to verify and test the diagnostic equipment of set-up were performed. Experimental studies of the formation of cluster beams of methane and argon-methane mixtures have been performed to determine the optimal conditions for the formation of intense molecular beams of methane clusters. We obtain an intense molecular beam of methane clusters. It was found that in a supersonic jet of large size pure methane clusters are not diagnosed by the mass spectrum of oligomeric fragments, whereas in mixtures of argon with small admixtures of methane is recorded in the mass spectrum, apparently as oligomers of methane and mixed clusters of argon-methane . It was confirmed that the clustering of methane starts at lower pressures of inhibition than argon and lead to further delay of cluster formation in argon. It is shown that for high intensity methane clusters fluxes should be used specially selected gas mixtures

21

Zheng, Zhi-Hao, Wang Li, Ling-Nan Wu, Kai-Ru Jin, Qiang Xu, Hong Wang, Bing-Zhi Liu, Zhan-Dong Wang, and Zhen-Yu Tian. "Pyrolysis study of iso-propylamine with SVUV-photoionization molecular-beam mass spectrometry." Combustion and Flame 244 (October 2022): 112232. http://dx.doi.org/10.1016/j.combustflame.2022.112232.

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22

Williams, George J., Timothy B. Smith, Frank S. Gulczinski, and Alec D. Gallimore. "Correlating Laser Induced Fluorescence and Molecular Beam Mass Spectrometry Ion Energy Distributions." Journal of Propulsion and Power 18, no. 2 (March 2002): 489–91. http://dx.doi.org/10.2514/2.5960.

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23

Wierda, Derk Andrew, Chandra M. Reddy, and Carmela C. Amato-Wierda. "Gas phase analysis of TiCl4 plasma processes by molecular beam mass spectrometry." Surface and Coatings Technology 148, no. 2-3 (December 2001): 256–61. http://dx.doi.org/10.1016/s0257-8972(01)01343-3.

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24

Syage, Jack A. "REAL-TIME DETECTION of Chemical Agents Using Molecular Beam Laser Mass Spectrometry." Analytical Chemistry 62, no. 8 (April 1990): 505A—509A. http://dx.doi.org/10.1021/ac00207a740.

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25

Zavilopulo, A. N., O. B. Shpenik, and A. M. Mylymko. "Examination of a molecular se beam by mass spectrometry with electron ionization." Technical Physics 62, no. 3 (March 2017): 359–64. http://dx.doi.org/10.1134/s106378421703029x.

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26

Tian, Dong-Xu, Yue-Xi Liu, Bing-Yin Wang, Chuang-Chuang Cao, Zhong-Kai Liu, Yi-Tong Zhai, Yan Zhang, Jiu-Zhong Yang, and Zhen-Yu Tian. "Pyrolysis study of iso-propylbenzene with photoionization and molecular beam mass spectrometry." Combustion and Flame 209 (November 2019): 313–21. http://dx.doi.org/10.1016/j.combustflame.2019.07.036.

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27

Liu, Yue-Xi, Zhi-Hao Zheng, Dong-Xu Tian, Zhen-Yu Tian, Chuang-Chuang Cao, Zhong-Kai Liu, Yi-Tong Zhai, Yan Zhang, and Jiu-Zhong Yang. "Pyrolysis study of 1,2,4-trimethylcyclohexane with SVUV-photoionization molecular-beam mass spectrometry." Combustion and Flame 219 (September 2020): 449–55. http://dx.doi.org/10.1016/j.combustflame.2020.06.020.

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28

Chen, Jin-Tao, Dan Yu, Wang Li, Wen-Ye Chen, Shu-Bao Song, Cheng Xie, Jiu-Zhong Yang, and Zhen-Yu Tian. "Oxidation study of benzaldehyde with synchrotron photoionization and molecular beam mass spectrometry." Combustion and Flame 220 (October 2020): 455–67. http://dx.doi.org/10.1016/j.combustflame.2020.07.019.

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29

Butkovskaya, N. I., E. S. Vasil'ev, and I. I. Morozov. "Molecular-beam mass spectrometry of van der Waals clusters. Mass spectrum of hydrogen sulfide dimer." Russian Chemical Bulletin 44, no. 5 (May 1995): 813–18. http://dx.doi.org/10.1007/bf00696907.

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30

Kozliak, Evguenii, Mark Sulkes, Ibrahim Alhroub, Alena Kubátová, Anastasia Andrianova, and Wayne Seames. "Influence of early stages of triglyceride pyrolysis on the formation of PAHs as coke precursors." Physical Chemistry Chemical Physics 21, no. 36 (2019): 20189–203. http://dx.doi.org/10.1039/c9cp02025j.

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31

Scuderi, D., A. Paladini, M. Satta, D. Catone, F. Rondino, A. Filippi, S. Piccirillo, M. Speranza, and A. Giardini Guidoni. "Solvent free interactions in contact pairs of molecules of biological interest: Laser spectroscopic and electrospray mass spectrometric studies." International Journal of Photoenergy 6, no. 1 (2004): 17–21. http://dx.doi.org/10.1155/s1110662x04000030.

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A laser spectroscopic and mass spectrometric study of ionic and molecular clusters of biological interest is reported. The molecules of interest and their aggregates were generated in a supersonic beam and analyzed by mass resolved resonant two photon absorption and ionization (R2PI) and by collision induced mass spectrometry (CID-MS). The absence of the solvent allows to study these systems in the isolated state free of undesired solvent effects which may level off the differences in their properties. The gas phase results have been compared to theoretical estimates of the structure and stability of the systems under investigation.

32

Aoki, Jun, Masako Isokawa, and Michisato Toyoda. "Space and Time Coherent Mapping for Subcellular Resolution of Imaging Mass Spectrometry." Cells 11, no. 21 (October 26, 2022): 3382. http://dx.doi.org/10.3390/cells11213382.

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Space and time coherent mapping (STCM) is a technology developed in our laboratory for improved matrix-assisted laser desorption ionization (MALDI) time of flight (TOF) imaging mass spectrometry (IMS). STCM excels in high spatial resolutions, which probe-based scanning methods cannot attain in conventional MALDI IMS. By replacing a scanning probe with a large field laser beam, focusing ion optics, and position-sensitive detectors, STCM tracks the entire flight trajectories of individual ions throughout the ionization process and visualizes the ionization site on the sample surface with a subcellular scale of precision and a substantially short acquisition time. Results obtained in thinly sectioned leech segmental ganglia and epididymis demonstrate that STCM IMS is highly suited for (1) imaging bioactive lipid messengers such as endocannabinoids and the mediators of neuronal activities in situ with spatial resolution sufficient to detail subcellular localization, (2) integrating resultant images in mass spectrometry to optically defined cell anatomy, and (3) assembling a stack of ion maps derived from mass spectra for cluster analysis. We propose that STCM IMS is the choice over a probe-based scanning mass spectrometer for high-resolution single-cell molecular imaging.

33

N. P., Tarasova, Zanin A. A., and Krivoborodov E. G. "Electron-beam Initiated Polymerization of Elemental Phosphorus." International Journal of Chemical Engineering and Materials 2 (November 2, 2023): 77–80. http://dx.doi.org/10.37394/232031.2023.2.11.

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The article discusses the results of the synthesis of polymer phosphorus from the elemental phosphorus in the aqueous medium under the electron-beam irradiation. The structure of the obtained high-molecular phosphorus-containing compounds was analyzed and compared with samples of commercially available red phosphorus by mass spectrometry with matrix-activated laser desorption/ionization.

34

Gerasimov, Iliya, Denis Knyazkov, Andrey Shmakov, Oleg Korobeinichev, Nils Hansen, and Charles Westbrook. "Investigation of Methyl Pentanoate Flame Structure by Molecular-Beam Mass Spectrometry and Modeling." Siberian Journal of Physics 9, no. 3 (October 1, 2014): 49–62. http://dx.doi.org/10.54362/1818-7919-2014-9-3-49-62.

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The structure of four stoichiometric and fuel-rich premixed flames of methyl pentanoate stabilized at low (20 torr) and atmospheric pressures has been studied by molecular-beam mass spectrometry. The data obtained have been compared with results of numerical simulations, performed with implication of two detailed chemical kinetic mechanisms, one of which has been developed by the authors of this work. While both mechanisms have predicted concentration profiles for most of the species quite well, some discrepancies between experimental and modeling data have been observed for carbon monoxide and some intermediate products. Considerable differences in several profiles simulated with different mechanisms have been noted. Analysis of reaction paths in investigated flames has shown most of these differences to be caused by different reactions and kinetics used for isomerization of primary radicals of methyl pentanoate oxidation in these mechanisms

35

Li, Wang, Jiu-Zhong Yang, Long Zhao, Dan Yu, and Zhen-Yu Tian. "Pyrolysis investigation of n-propylamine with synchrotron photoionization and molecular-beam mass spectrometry." Combustion and Flame 232 (October 2021): 111511. http://dx.doi.org/10.1016/j.combustflame.2021.111511.

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36

Mikhaylov, V. I., and L. E. Polyak. "Mass-Spectrometry Investigation of the Kinetics of the Molecular-Beam Epitaxy of CdTe." Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques 15, no. 4 (July 2021): 683–95. http://dx.doi.org/10.1134/s1027451021040133.

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37

Zhang, Qiang, and Alec M. Wodtke. "Using Volatile Solvents for Ion Formation in Liquid Molecular Beam Expansion Mass Spectrometry." Analytical Chemistry 77, no. 23 (December 2005): 7612–17. http://dx.doi.org/10.1021/ac050792l.

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38

Appelhans, Anthony D., James E. Delmore, and David A. Dahl. "Focused, rasterable, high-energy neutral molecular beam probe for secondary ion mass spectrometry." Analytical Chemistry 59, no. 13 (July 1987): 1685–91. http://dx.doi.org/10.1021/ac00140a022.

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39

Styris, D. L., and D. A. Redfield. "Mechanisms of graphite furnace atomization of aluminum by molecular beam sampling mass spectrometry." Analytical Chemistry 59, no. 24 (December 15, 1987): 2891–97. http://dx.doi.org/10.1021/ac00151a012.

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40

Zarvin, A. E., V. V. Kalyada, and V. E. Khudozhitkov. "Features of molecular-beam mass spectrometry registration of clusters in underexpanded supersonic jets." Thermophysics and Aeromechanics 24, no. 5 (September 2017): 671–81. http://dx.doi.org/10.1134/s0869864317050031.

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41

Schubert, E. F., H. S. Luftman, R. F. Kopf, R. L. Headrick, and J. M. Kuo. "Secondary‐ion mass spectrometry on δ‐doped GaAs grown by molecular beam epitaxy." Applied Physics Letters 57, no. 17 (October 22, 1990): 1799–801. http://dx.doi.org/10.1063/1.104026.

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42

Antoine, Rodolphe, Isabelle Compagnon, Driss Rayane, Michel Broyer, Philippe Dugourd, Nicolas Sommerer, Michel Rossignol, David Pippen, Frederick C. Hagemeister, and Martin F. Jarrold. "Application of Molecular Beam Deflection Time-of-Flight Mass Spectrometry to Peptide Analysis." Analytical Chemistry 75, no. 20 (October 2003): 5512–16. http://dx.doi.org/10.1021/ac030202o.

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43

Paletsky, A. A., A. G. Tereshchenko, E. N. Volkov, O. P. Korobeinichev, G. V. Sakovich, V. F. Komarov, and V. A. Shandakov. "Study of the CL-20 flame structure using probing molecular beam mass spectrometry." Combustion, Explosion, and Shock Waves 45, no. 3 (May 2009): 286–92. http://dx.doi.org/10.1007/s10573-009-0038-0.

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44

Aubry, O., J. L. Delfau, C. Met, L. Vandenbulcke, and C. Vovelle. "Precursors of diamond films analysed by molecular beam mass spectrometry of microwave plasmas." Diamond and Related Materials 13, no. 1 (January 2004): 116–24. http://dx.doi.org/10.1016/j.diamond.2003.09.009.

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45

Park, Soonam, Feng Liao, John M. Larson, Steven L. Girshick, and Michael R. Zachariah. "Molecular Beam Mass Spectrometry System for Characterization of Thermal Plasma Chemical Vapor Deposition." Plasma Chemistry and Plasma Processing 24, no. 3 (September 2004): 353–72. http://dx.doi.org/10.1007/s11090-004-2273-1.

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46

Georgiou, S., E. Mastoraki, E. Raptakis, and Z. Xenidi. "The Potential of Vacuum Ultraviolet Photoionization Mass Spectrometry in Monitoring Photofragmentation of Organometallics." Laser Chemistry 13, no. 2 (January 1, 1993): 113–19. http://dx.doi.org/10.1155/1993/26032.

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The paper examines the potential of vacuum ultraviolet (VUV) photoionization mass spectroscopy in probing the fragmentation of organometallics in molecular-beam studies and laser-assisted deposition processes. To this end, the ionic fragmentation pattern of few common organometallics, namely metallocenes and carbonyls, is examined at selected VUV wavelengths, produced by microwave-discharge resonance atomic lamps. Discussion of the recorded spectra in terms of the electronic structure of the compounds indicates lack of dynamical bias in the VUV photoionization/fragmentation of metal complexes. Excitation with VUV light results in simpler ionic fragmentation patterns than what observed with electron-impact ionization, thereby enabling accurate monitoring of the excimer-laser photodissociation of organometallics. Finally, the intensity of the VUV ionic signal appears to be adequate for molecular-beam studies. An illustrative example is provided for the study of the 248nm-induced photodesorption of Mo(CO)6 from cryogenic films.

47

Agblevor, F. A., R. J. Evans, and K. D. Johnson. "Molecular-beam mass-spectrometric analysis of lignocellulosic materials." Journal of Analytical and Applied Pyrolysis 30, no. 2 (December 1994): 125–44. http://dx.doi.org/10.1016/0165-2370(94)00808-6.

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48

Castellanos, Anthony, Richard H. Gomer, and Francisco Fernandez-Lima. "Submicron 3-D mass spectrometry imaging reveals an asymmetric molecular distribution on chemotaxing cells." F1000Research 11 (September 8, 2022): 1017. http://dx.doi.org/10.12688/f1000research.124273.1.

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Background: Dictyostelium discoideum is a ~10 µm diameter unicellular eukaryote that lives on soil surfaces. When starved, D. discoideum cells aggregate into streams of cells in a process called chemotaxis. In this report, we studied D. discoideum cells during chemotaxis using 3D - mass spectrometry imaging (3D-MSI). Methods: The 3D-MSI consisted of the sequential generation of 2D molecular maps using burst alignment coupled to delayed extraction time-of flight secondary ion mass spectrometry (TOF-SIMS) combined with a soft sputtering beam to access the different layers. Results: Molecular maps with sub-cellular high spatial resolution (~300 nm) indicated the presence of ions at m/z = 221 and 236 at the front and sides, but reduced levels at the back, of cells moving toward of aggregation streams. The 3D-MSI also detected an ion at m/z = 240 at the edges and back, but reduced levels at the front, of aggregating cells. Other ions showed an even distribution across the cells. Conclusions: Together, these results demonstrate the utility of sub-micron MSI to study eukaryotic chemotaxis.

49

Amirav, Aviv, and Ori Granot. "Liquid chromatography mass spectrometry with supersonic molecular beams." Journal of the American Society for Mass Spectrometry 11, no. 6 (June 2000): 587–91. http://dx.doi.org/10.1016/s1044-0305(00)00125-2.

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50

Chatillon, Christian, and Ioana Nuta. "Spurious molecular beams in Knudsen effusion mass spectrometry." Calphad 65 (June 2019): 8–15. http://dx.doi.org/10.1016/j.calphad.2019.01.009.

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